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• Varnish POST problem "9 FetchError c backend write error: 11" for application/x-www-form-urlencoded content

  - by ompap

  Cutting a longish story short, we have managed to get a more precise error out of Varnishlog. Varnishlog tells us that we are sending a 31 TxRequest - POST 31 TxHeader - Content-Type: application/x-www-form-urlencoded but we are getting 9 FetchError c backend write error: 11 31 BackendClose - [backend name] 9 VCL_call c error 9 VCL_return c deliver 9 Length c 488 9 VCL_call c deliver 9 VCL_return c deliver 9 TxProtocol c HTTP/1.1 9 TxStatus c 503 We still do not know what this is exactly, but apparently Content-Type: application/x-www-form-urlencoded is not getting through as it should. Help still needed, please! Original message below. The title was "Varnish not letting Joomla users to log in - 503 guru meditation error", but I changed it to get more attention to the problem and not to the symptoms. Hello, We have a production site for a local newspaper which is currently behind an Apache reverse proxy, basicly the site on one server and the other being reserved as a reverse proxy only (well, there is more but that has no relevance here). Apache as a reverse proxy works, but could be faster. We want to change the reverse proxy to use Varnish instead of Apache on an Ubuntu 10.4 Server. The Varnish is version 2.10 installed directly from Ubuntu repos. Ubuntu 10.4 uses PHP 5.3.2. For anonymous surfers the site works wonderfully with Varnish. So far we can get very good speed out of Varnish, we just have a few problems with logging in or out. The big one is, that the users cannot log in: they get a Varnish 503 error page every time. The logs do not reveal the cause. It feels as if the request would never leave Varnish. So we are merely guessing - not a strong starting point. We have gone through what has been suggested on various plces on the web. We have increased the timeouts to backend xxx { .host = "xxx.xx"; .port = "http"; .connect_timeout = 60s; .first_byte_timeout = 60s; .between_bytes_timeout = 60s; } but we seem to get the 503 guru error page much faster than that, as in approx. 5 seconds. We have increased the Varnish headers size to 128 in daemon. In vcl_recv we have if (req.http.Authenticate || req.http.Authorization) { return(pass); } and in vcl_fetch ## auhtentication handling if (req.http.Authenticate || req.http.Authorization) { return(pass); } We do not strip cookies. We have tried to make sure that error pages are not cached. As said above, we cannot see anything in the backend Apache logs, apparently it never gets asked for Joomla user authentication. Varnish does not seem to get much mentioning with connection to Joomla. (We cannot dump Joomla, that selection has been done and we just have to live with what we have been given) Has anyone a working Varnish - Joomla combination? Thanks for reading. Please help. We need some hints - desperately. Any suggestions? ompap

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• TypeError: Error #2007: Parameter child must be non-null.

  - by Bobby Francis Joseph

  I am running the following piece of code: package { import fl.controls.Button; import fl.controls.Label; import fl.controls.RadioButton; import fl.controls.RadioButtonGroup; import flash.display.Sprite; import flash.events.MouseEvent; import flash.text.TextFieldAutoSize; public class RadioButtonExample extends Sprite { private var j:uint; private var padding:uint = 10; private var currHeight:uint = 0; private var verticalSpacing:uint = 30; private var rbg:RadioButtonGroup; private var questionLabel:Label; private var answerLabel:Label; private var question:String = "What day is known internationally as Speak Like A Pirate Day?"; private var answers:Array = [ "August 12", "March 4", "September 19", "June 22" ]; public function RadioButtonExample() { setupQuiz(); } private function setupQuiz():void { setupQuestionLabel(); setupRadioButtons(); setupButton(); setupAnswerLabel(); } private function setupQuestionLabel():void { questionLabel = new Label(); questionLabel.text = question; questionLabel.autoSize = TextFieldAutoSize.LEFT; questionLabel.move(padding, padding + currHeight); currHeight += verticalSpacing; addChild(questionLabel); } private function setupAnswerLabel():void { answerLabel = new Label(); answerLabel.text = ""; answerLabel.autoSize = TextFieldAutoSize.LEFT; answerLabel.move(padding + 120, padding + currHeight); addChild(answerLabel); } private function setupRadioButtons():void { rbg = new RadioButtonGroup("question1"); createRadioButton(answers[0], rbg); createRadioButton(answers[1], rbg); createRadioButton(answers[2], rbg); createRadioButton(answers[3], rbg); } private function setupButton():void { var b:Button = new Button(); b.move(padding, padding + currHeight); b.label = "Check Answer"; b.addEventListener(MouseEvent.CLICK, checkAnswer); addChild(b); } private function createRadioButton(rbLabel:String, rbg:RadioButtonGroup):void { var rb:RadioButton = new RadioButton(); rb.group = rbg; rb.label = rbLabel; rb.move(padding, padding + currHeight); addChild(rb); currHeight += verticalSpacing; } private function checkAnswer(e:MouseEvent):void { if (rbg.selection == null) { return; } var resultStr:String = (rbg.selection.label == answers[2]) ? "Correct" : "Incorrect"; answerLabel.text = resultStr; } } } This is from Adobe Livedocs. http://www.adobe.com/livedocs/flash/9.0/ActionScriptLangRefV3/ I have added a Radiobutton to stage and then deleted it so that its there in the library. However I am getting the following error TypeError: Error #2007: Parameter child must be non-null. at flash.display::DisplayObjectContainer/addChildAt() at fl.controls::BaseButton/fl.controls:BaseButton::drawBackground() at fl.controls::LabelButton/fl.controls:LabelButton::draw() at fl.controls::Button/fl.controls:Button::draw() at fl.core::UIComponent/::callLaterDispatcher() Can anyone tell me what is going on and how to remove this error.

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• Query Tamino server with xql parameter in URL. Exclude nodes with specific child.

  - by Anon

  I have to query a Tamino database through HTTP. http://example.com/db?DocumentType=publication&year=all gives me a list of all publication in the database, something like: <publication> <title> The first publications title </title> <author> Author, M </author> <LastModification> <year> 2008 </year> <month> 05 </month> </LastModification> <year> 2006 </year> </publication> <publication> <title> The second publications title </title> <author> Secauthor, M </author> <LastModification> <year> 2005 </year> <month> 01 </month> </LastModification> <year> 2000 </year> </publication> <publication> <title> Another publications title </title> <author> Anauthor, M </author> <year> 2008 </year> </publication> (Simplified values) There is a xql parameter that can be specified and that can be used to filter the output, so I can do: http://example.com/db?DocumentType=publication&year=all&xql=LastModification/year~>2008 Which results in: <publication> <title> The publications title </title> <author> Author, M </author> <LastModification> <year> 2008 </year> <month> 05 </month> </LastModification> <year> 2006 </year> </publication> <publication> <title> Another publications title </title> <author> Anauthor, M </author> <year> 2008 </year> </publication> There is very little documentation... I want to be able to first get all publications that have changed since the last update (and only those), and then in a second query all publications that do not have a <LastModification> tag.

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• Everytime user types , in my text box i want it to become ',' or help me do it using a parameter

  - by MyHeadHurts

  I am using a vb.net textbox to become part of my IN sql statement in my program I tryed to use a parameter and it didn't work here is my code TextBox1.Text = "'Cruises','Caribbean and Mexico','CentralSouth America', 'Europe','Far East','France','Italy','London/UK','Middle East/Africa','South Pacific','Spain/Portugal','USA/Canada'" the default value of my textbox although the user can edit the textbox, but they would need to type the ',' which i would rather them just type , . and my other code is If RadioButtonList1.SelectedValue = "Sales" And CheckBox1.Checked = False Then 'saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, dbo.B605SaleAsOfAdvancedMaster.AsOFSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, dbo.B605SaleAsOfAdvancedMaster.YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, dbo.B604SalesAsOfAdvanced.Sales AS CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =" & DropDownList1.SelectedValue & ") AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) order by B605SaleAsOfAdvancedMaster.SDESCR" saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, dbo.B605SaleAsOfAdvancedMaster.AsOFSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, dbo.B605SaleAsOfAdvancedMaster.YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, dbo.B604SalesAsOfAdvanced.Sales AS CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in ('Cruises','Caribbean and Mexico','CentralSouth America', 'Europe','Far East','France','Italy','London/UK','Middle East/Africa','South Pacific','Spain/Portugal','USA/Canada') order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Sales" ElseIf RadioButtonList1.SelectedValue = "NetSales" And CheckBox1.Checked = False Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, (ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFNET,0) + (ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFOther,0))) as AsofSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, (ISNULL(dbo.B605SaleAsOfAdvancedMaster.YENET,0) + (ISNULL(dbo.B605SaleAsOfAdvancedMaster.YEOther,0))) as YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, (ISNULL(dbo.B604SalesAsOfAdvanced.netSales,0) + (ISNULL(dbo.B604SalesAsOfAdvanced.OtherSales,0))) as CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in ('Cruises','Caribbean and Mexico','CentralSouth America', 'Europe','Far East','France','Italy','London/UK','Middle East/Africa','South Pacific','Spain/Portugal','USA/Canada') order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Net Sales" ElseIf RadioButtonList1.SelectedValue = "INSSales" And CheckBox1.Checked = False Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFINS,0)as AsofSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, ISNULL(dbo.B605SaleAsOfAdvancedMaster.YEINS,0) as YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, ISNULL(dbo.B604SalesAsOfAdvanced.INSSales,0) as CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in ('Cruises','Caribbean and Mexico','CentralSouth America', 'Europe','Far East','France','Italy','London/UK','Middle East/Africa','South Pacific','Spain/Portugal','USA/Canada') order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Insurance Sales" ElseIf RadioButtonList1.SelectedValue = "CXSales" And CheckBox1.Checked = False Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFCX,0)as AsofSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, ISNULL(dbo.B605SaleAsOfAdvancedMaster.YECX,0) as YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, ISNULL(dbo.B604SalesAsOfAdvanced.CXSales,0) as CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in ('Cruises','Caribbean and Mexico','CentralSouth America', 'Europe','Far East','France','Italy','London/UK','Middle East/Africa','South Pacific','Spain/Portugal','USA/Canada') order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Canceled Sales" ElseIf RadioButtonList1.SelectedValue = "Sales" And CheckBox1.Checked = True Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, dbo.B605SaleAsOfAdvancedMaster.AsOFSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, dbo.B605SaleAsOfAdvancedMaster.YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, dbo.B604SalesAsOfAdvanced.Sales AS CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in (" & TextBox1.Text & ") order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Sales" ElseIf RadioButtonList1.SelectedValue = "NetSales" And CheckBox1.Checked = True Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, (ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFNET,0) + (ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFOther,0))) as AsofSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, (ISNULL(dbo.B605SaleAsOfAdvancedMaster.YENET,0) + (ISNULL(dbo.B605SaleAsOfAdvancedMaster.YEOther,0))) as YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, (ISNULL(dbo.B604SalesAsOfAdvanced.netSales,0) + (ISNULL(dbo.B604SalesAsOfAdvanced.OtherSales,0))) as CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in (" & TextBox1.Text & ") order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Net Sales" ElseIf RadioButtonList1.SelectedValue = "INSSales" And CheckBox1.Checked = True Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFINS,0)as AsofSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, ISNULL(dbo.B605SaleAsOfAdvancedMaster.YEINS,0) as YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, ISNULL(dbo.B604SalesAsOfAdvanced.INSSales,0) as CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in (" & TextBox1.Text & ") order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Insurance Sales" ElseIf RadioButtonList1.SelectedValue = "CXSales" And CheckBox1.Checked = True Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFCX,0)as AsofSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, ISNULL(dbo.B605SaleAsOfAdvancedMaster.YECX,0) as YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, ISNULL(dbo.B604SalesAsOfAdvanced.CXSales,0) as CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in (" & TextBox1.Text & ") order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Canceled Sales" End If Basically what is happening is, if a certain radio button is selected and the user didn't click the checkbox the default regions are included and they are hardcoded because the query runs much faster. if the user did click the checkbox then the textbox where they type the specific regions shows up and it will run the query that includes the dbo.B605SaleAsOfAdvancedMaster.SDESCR in (" & TextBox1.Text & ") If you can somehow do this using parameters and not with the textbox1.text in the query it will run much faster for me thanks for your help

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• Is it possible to specify a generic constraint for a type parameter to be convertible FROM another t

  - by fostandy

  Suppose I write a library with the following: public class Bar { /* ... */ } public class SomeWeirdClass<T> where T : ??? { public T BarMaker(Bar b) { // ... play with b T t = (T)b return (T) b; } } Later, I expect users to use my library by defining their own types which are convertible to Bar and using the SomeWeirdClass 'factory'. public class Foo { public static explicit operator Foo(Bar f) { return new Bar(); } } public class Demo { public static void demo() { Bar b = new Bar(); SomeWeirdClass<Foo> weird = new SomeWeirdClass<Foo>(); Foo f = weird.BarMaker(b); } } this will compile if i set where T : Foo but the problem is that I don't know about Foo at the library's compile time, and I actually want something more like where T : some class that can be instantiated, given a Bar Is this possible? From my limited knowledge it does not seem to be, but the ingenuity of the .NET framework and its users always surprises me... This may or not be related to the idea of static interface methods - at least, I can see the value in being able to specify the presence of factory methods to create objects (similar to the same way that you can already perform where T : new()) edit: Solution - thanks to Nick and bzIm - For other readers I'll provide a completed solution as I understand it: edit2: This solution requires Foo to expose a public default constructor. For an even stupider better solution that does not require this see the very bottom of this post. public class Bar {} public class SomeWeirdClass<T> where T : IConvertibleFromBar<T>, new() { public T BarMaker(Bar b) { T t = new T(); t.Convert(b); return t; } } public interface IConvertibleFromBar<T> { T Convert(Bar b); } public class Foo : IConvertibleFromBar<Foo> { public static explicit operator Foo(Bar f) { return null; } public Foo Convert(Bar b) { return (Foo) b; } } public class Demo { public static void demo() { Bar b = new Bar(); SomeWeirdClass<Foo> weird = new SomeWeirdClass<Foo>(); Foo f = weird.BarMaker(b); } } edit2: Solution 2: Create a type convertor factory to use: #region library defined code public class Bar {} public class SomeWeirdClass<T, TFactory> where TFactory : IConvertorFactory<Bar, T>, new() { private static TFactory convertor = new TFactory(); public T BarMaker(Bar b) { return convertor.Convert(b); } } public interface IConvertorFactory<TFrom, TTo> { TTo Convert(TFrom from); } #endregion #region user defined code public class BarToFooConvertor : IConvertorFactory<Bar, Foo> { public Foo Convert(Bar from) { return (Foo) from; } } public class Foo { public Foo(int a) {} public static explicit operator Foo(Bar f) { return null; } public Foo Convert(Bar b) { return (Foo) b; } } #endregion public class Demo { public static void demo() { Bar b = new Bar(); SomeWeirdClass<Foo, BarToFooConvertor> weird = new SomeWeirdClass<Foo, BarToFooConvertor>(); Foo f = weird.BarMaker(b); } }

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• Is it possible to specify a generic constraint for a type parameter to be convertible FROM another t

  - by fostandy

  Suppose I write a library with the following: public class Bar { /* ... */ } public class SomeWeirdClass<T> where T : ??? { public T BarMaker(Bar b) { // ... play with b T t = (T)b return (T) b; } } Later, I expect users to use my library by defining their own types which are convertible to Bar and using the SomeWeirdClass 'factory'. public class Foo { public static explicit operator Foo(Bar f) { return new Bar(); } } public class Demo { public static void demo() { Bar b = new Bar(); SomeWeirdClass<Foo> weird = new SomeWeirdClass<Foo>(); Foo f = weird.BarMaker(b); } } this will compile if i set where T : Foo but the problem is that I don't know about Foo at the library's compile time, and I actually want something more like where T : some class that can be instantiated, given a Bar Is this possible? From my limited knowledge it does not seem to be, but the ingenuity of the .NET framework and its users always surprises me... This may or not be related to the idea of static interface methods - at least, I can see the value in being able to specify the presence of factory methods to create objects (similar to the same way that you can already perform where T : new()) edit: Solution - thanks to Nick and bzIm - For other readers I'll provide a completed solution as I understand it: edit2: This solution requires Foo to expose a public default constructor. For an even stupider better solution that does not require this see the very bottom of this post. public class Bar {} public class SomeWeirdClass<T> where T : IConvertibleFromBar<T>, new() { public T BarMaker(Bar b) { T t = new T(); t.Convert(b); return t; } } public interface IConvertibleFromBar<T> { T Convert(Bar b); } public class Foo : IConvertibleFromBar<Foo> { public static explicit operator Foo(Bar f) { return null; } public Foo Convert(Bar b) { return (Foo) b; } } public class Demo { public static void demo() { Bar b = new Bar(); SomeWeirdClass<Foo> weird = new SomeWeirdClass<Foo>(); Foo f = weird.BarMaker(b); } } edit2: Solution 2: Create a type convertor factory to use: #region library defined code public class Bar {} public class SomeWeirdClass<T, TFactory> where TFactory : IConvertorFactory<Bar, T>, new() { private static TFactory convertor = new TFactory(); public T BarMaker(Bar b) { return convertor.Convert(b); } } public interface IConvertorFactory<TFrom, TTo> { TTo Convert(TFrom from); } #endregion #region user defined code public class BarToFooConvertor : IConvertorFactory<Bar, Foo> { public Foo Convert(Bar from) { return (Foo) from; } } public class Foo { public Foo(int a) {} public static explicit operator Foo(Bar f) { return null; } public Foo Convert(Bar b) { return (Foo) b; } } #endregion public class Demo { public static void demo() { Bar b = new Bar(); SomeWeirdClass<Foo, BarToFooConvertor> weird = new SomeWeirdClass<Foo, BarToFooConvertor>(); Foo f = weird.BarMaker(b); } }

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• SQL SERVER – SSIS Parameters in Parent-Child ETL Architectures – Notes from the Field #040

  - by Pinal Dave

  [Notes from Pinal]: SSIS is very well explored subject, however, there are so many interesting elements when we read, we learn something new. A similar concept has been Parent-Child ETL architecture’s relationship in SSIS. Linchpin People are database coaches and wellness experts for a data driven world. In this 40th episode of the Notes from the Fields series database expert Tim Mitchell (partner at Linchpin People) shares very interesting conversation related to how to understand SSIS Parameters in Parent-Child ETL Architectures. In this brief Notes from the Field post, I will review the use of SSIS parameters in parent-child ETL architectures. A very common design pattern used in SQL Server Integration Services is one I call the parent-child pattern.  Simply put, this is a pattern in which packages are executed by other packages.  An ETL infrastructure built using small, single-purpose packages is very often easier to develop, debug, and troubleshoot than large, monolithic packages.  For a more in-depth look at parent-child architectures, check out my earlier blog post on this topic. When using the parent-child design pattern, you will frequently need to pass values from the calling (parent) package to the called (child) package.  In older versions of SSIS, this process was possible but not necessarily simple.  When using SSIS 2005 or 2008, or even when using SSIS 2012 or 2014 in package deployment mode, you would have to create package configurations to pass values from parent to child packages.  Package configurations, while effective, were not the easiest tool to work with.  Fortunately, starting with SSIS in SQL Server 2012, you can now use package parameters for this purpose. In the example I will use for this demonstration, I’ll create two packages: one intended for use as a child package, and the other configured to execute said child package.  In the parent package I’m going to build a for each loop container in SSIS, and use package parameters to pass in a value – specifically, a ClientID – for each iteration of the loop.  The child package will be executed from within the for each loop, and will create one output file for each client, with the source query and filename dependent on the ClientID received from the parent package. Configuring the Child and Parent Packages When you create a new package, you’ll see the Parameters tab at the package level.  Clicking over to that tab allows you to add, edit, or delete package parameters. As shown above, the sample package has two parameters.  Note that I’ve set the name, data type, and default value for each of these.  Also note the column entitled Required: this allows me to specify whether the parameter value is optional (the default behavior) or required for package execution.  In this example, I have one parameter that is required, and the other is not. Let’s shift over to the parent package briefly, and demonstrate how to supply values to these parameters in the child package.  Using the execute package task, you can easily map variable values in the parent package to parameters in the child package. The execute package task in the parent package, shown above, has the variable vThisClient from the parent package mapped to the pClientID parameter shown earlier in the child package.  Note that there is no value mapped to the child package parameter named pOutputFolder.  Since this parameter has the Required property set to False, we don’t have to specify a value for it, which will cause that parameter to use the default value we supplied when designing the child pacakge. The last step in the parent package is to create the for each loop container I mentioned earlier, and place the execute package task inside it.  I’m using an object variable to store the distinct client ID values, and I use that as the iterator for the loop (I describe how to do this more in depth here).  For each iteration of the loop, a different client ID value will be passed into the child package parameter. The final step is to configure the child package to actually do something meaningful with the parameter values passed into it.  In this case, I’ve modified the OleDB source query to use the pClientID value in the WHERE clause of the query to restrict results for each iteration to a single client’s data.  Additionally, I’ll use both the pClientID and pOutputFolder parameters to dynamically build the output filename. As shown, the pClientID is used in the WHERE clause, so we only get the current client’s invoices for each iteration of the loop. For the flat file connection, I’m setting the Connection String property using an expression that engages both of the parameters for this package, as shown above. Parting Thoughts There are many uses for package parameters beyond a simple parent-child design pattern.  For example, you can create standalone packages (those not intended to be used as a child package) and still use parameters.  Parameter values may be supplied to a package directly at runtime by a SQL Server Agent job, through the command line (via dtexec.exe), or through T-SQL. Also, you can also have project parameters as well as package parameters.  Project parameters work in much the same way as package parameters, but the parameters apply to all packages in a project, not just a single package. Conclusion Of the numerous advantages of using catalog deployment model in SSIS 2012 and beyond, package parameters are near the top of the list.  Parameters allow you to easily share values from parent to child packages, enabling more dynamic behavior and better code encapsulation. If you want me to take a look at your server and its settings, or if your server is facing any issue we can Fix Your SQL Server. Reference: Pinal Dave (http://blog.sqlauthority.com)Filed under: Notes from the Field, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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• Cascading dropdownlist jQuery does not retain value on post back.

  - by John Smith

  I have two html select server control on an add data form page. the user selects a value in the first html select server control and then values are populated into the second html select server control with jquery. The problem is when a a user clicks the save button and the page posts back, the values are no longer in the drop down list populated by jQuery. The drop downlist is a html server control, shouldn't it retain the values on post-back? How can I retain the values and save the selected value to the database? $(document).ready(function() { $("#<%=ddlCourseWare.ClientID %>").change(function() { var courseWareId = this.value; try { $.ajax({ type: "POST", url: "Left_SubCategory.aspx/GetTabData", data: "{courseWareId:" + courseWareId + "}", contentType: "application/json; charset=utf-8", dataType: "json", success: function(data) { var result = json_parse(data.d); $("#<%=ddlTabType.ClientID %>")[0].innerHTML = ''; if (result.length > 0) { $.each(result, function(key, item) { $("#<%=ddlTabType.ClientID %>").append($("<option></option>").val(item.id).html(item.TabName)); }); } else { $("#<%=ddlTabType.ClientID %>").append($("<option></option>").val('0').html('--Select--')); } }, error: function(request, status, error) { alert(request.responseText); } }); } catch (ex) { alert(ex); } }); }); HTML <select id="ddlCourseWare" name="ddlCourseWare" runat="server" Width="230px" class="TextBox" Height="18px" > <select id="ddlTabType" name="ddlTabType" runat="server" Width="230px" class="TextBox" Height="18px" onchange="BindMainCat();"> <option>--Select--</option> </select> C# private void BindCourseWare() { ddlCourseWare.DataSource = courseWare.GetCourseWare(); ddlCourseWare.DataTextField = "CourseWareType"; ddlCourseWare.DataValueField = "id"; ddlCourseWare.DataBind(); ddlCourseWare.Items.Insert(0, "----Select Course Ware----"); } [WebMethod] public static string GetTabData(int courseWareId) { var result = new CourseWare().GetCourseTabByCoursewareId(courseWareId); JavaScriptSerializer json_tabs = new JavaScriptSerializer(); string jsonArray_tabs = json_tabs.Serialize(result); return jsonArray_tabs; } protected void btnSave_Click(object sender, EventArgs e) { int mainCategoryID1 = int.Parse(ddlTabType.Value); // not working int mainCategoryID2 = int.Parse(Request["ctl00$ContentPlaceHolder1$ddlTabType"]); // working but always return same value means the upper value (selected index 1) }

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• How to receive modified model value in MVC's Post method?

  - by kapil

  HI, Does anyone know how can I receive the modified model value which I have bound to controls on view page. For instance I have used a text box on view, as follows- <%=Html.TextBoxFor(model => Model.firstName, new { id = "txtFirstName"})%> But in my post method I am not able to receive the modified value from the text box. Any solution? Thanks, Kapil

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• How to implement a feature: Post to a forum via email ?

  - by pixeline

  I'm investigating the development of a new forum and found via user feedback that posting to the forum via their email client would be a very useful feature. I'm wondering: is it possible? Can php check for an inbox folder and turn each email into a forum post? And if so, how to do that in a LAMP environment?

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• How to bind Lists of a custom view model to a dropDownList an get the selected value after POST in A

  - by user187220

  I have following problem. In my view model I defined some list properties as follows: public class BasketAndOrderSearchCriteriaViewModel { List<KeyValuePair> currencies; public ICollection<KeyValuePair> Currencies { get { if (this.currencies == null) this.currencies = new List<KeyValuePair>(); return this.currencies; } } List<KeyValuePair> deliverMethods; public ICollection<KeyValuePair> DeliveryMethods { get { if (this.deliverMethods == null) this.deliverMethods = new List<KeyValuePair>(); return this.deliverMethods; } } } This view model is embedded in another view model: public class BasketAndOrderSearchViewModel { public BasketAndOrderSearchCriteriaViewModel Criteria { [System.Diagnostics.DebuggerStepThrough] get { return this.criteria; } } } I use 2 action methods; one is for the GET and the other for POST: [HttpGet] public ActionResult Search(BasketAndOrderSearchViewModel model){...} [HttpPost] public ActionResult SubmitSearch(BasketAndOrderSearchViewModel model){...} In the view I implement the whole view model by using the EditorFor-Html Helper which does not want to automatically display DropDownLists for List properties! 1. Question: How can you let EditorFor display DropDownLists? Since I could not figure out how to display DropDownLists by using EditorFor, I used the DropDownList Html helper and filled it through the view model as follows: public IEnumerable<SelectListItem> DeliveryMethodAsSelectListItem() { List<SelectListItem> list = new List<SelectListItem>(); list.Add(new SelectListItem() { Selected = true, Text = "<Choose Delivery method>", Value = "0" }); foreach (var item in this.DeliveryMethods) { list.Add(new SelectListItem() { Selected = false, Text = item.Value, Value = item.Key }); } return list; } My 2. question: As you can see I pass my view model to the action metho with POST attribute! Is there a way to get the selected value of a DropDownList get binded to the passed view model? At the moment all the DropDownList are empty and the selected value can only be fetched by the Request.Form which I definitely want to avoid! I would greatly appreciate some ideas or tips on this!

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• How to protect yourself from XSS when you allow people to post RAW embeded codes?

  - by Axel

  Hi. Tumblr and other blogging websites allows people to post embeded codes of videos from youtube and all video networks. but how they filter only the flash object code and remove any other html or scripts? and even they have an automated code that informes you this is not a valid video code. Is this done with REGEX expressions? And Is there a PHP code to do that? Thanks

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• How to POST to Vitalist.com's API via Powershell?

  - by GollyJer

  I'd liketo use Powershell to post a new action to my Vitalist.com account. The Vitalist API documentation is here. I've tried HttpWebResponse in Powershell but I'm missing something. Any pointers are appreciated. Thanks.

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• Will methods like POST and GET formally evolve someday?

  - by Jorge

  The question may sound a bit naive or stupid, but i was wondering...will POST and GET evolve someday? What other methods exist besides those two? I was wondering specifically about server-pushes... why can't exist a method specifically for that? I don't even know if there's already something similar, and if there is, i apologize for my ignorance. The web is evolving, that's evident...will methods formally evolve too?

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• Which is the best python library to make REST request like PUT, GET, DELETE, POST and how ?

  - by Parthiv

  Hi, I am bit confuse over set of libraries of pythons to connect with REST enabled web services. I have tried httplib, urllib and urllib2. I want to know how can methods like PUT, GET, POST, DELETE can be achieved using this library. Regards, Parthiv

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• How do I send a cross-domain POST request via JavaScript?

  - by Ido Schacham

  How do I send a cross-domain POST request via JavaScript? Notes - it shouldn't refresh the page, and I need to grab and parse the response afterward. Your help with some code examples will be much appreciated.

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• Can I post a guide on SO as a question?

  - by Sahat

  I want to post a guide or a collection of learning resources on how to get started with developing for Windows Phone 7. Is it okay to start a guide by clicking ASK QUESTION button even though it's not really a question? Will I get down-ranked for that?

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• What are the data type limitations of the POST and GET HTML Form Methods?

  - by Brook Julias

  What are the data type limitations of the POST and GET HTML Form Methods? Are you limited to passing only specific data types like--strings, integers, floats.

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• A good way to redirect with a POST request?

  - by RadiantHex

  Hi folks, I need to redirect a user to an external site though a POST request. The only option I figured out is to do it submit a form through JavaScript. Any ideas?

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• How to add a build time to a file archive as a post-build macro?

  - by Ashley Simpson

  I want to pack the project into a zip-file and have the build date time (or the current date time) as part of the zip-filename. $(TargetDir)\7za.exe -a release.zip *.* So it would be nice to incorporate the date into the release.zip, something like release-14-3-2010-22_56.zip Is it possible to define custom post-build macros?

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• Flash/Actionscript - How can I post a tweet from a swf (without using a server-side proxy such as Tw

  - by John Himmelman

  How can I post a tweet directly to twitter without needing to use a server-side proxy script (ie, tweetr)? Can a twitter API call be made directly from a swf?

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• How can I post something to a Wall using Facebook Developer Toolkit?

  - by jamesaharvey

  Does anyone have experience using the Facebook Developer Toolkit? I am trying to post something to a Facebook user's Wall, but can't figure out how to use the API? Could someone could give me an example or point me to some documentation on the API's usage?

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• How can I make an upload widget in JavaScript with upload progress that will post a file to an IIS s

  - by markcial

  I need to make a upload widget in JavaScript with upload progress that will post file to a IIS server, any suggestions guidelines or documentation?

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• How to update the session values on partial post back and how to make Javascript use the new values

  - by Mano

  The problem I am facing is the I am passing values to javascript to draw a graph using session values in the code behind. When page loads it take the value from the session and creates the graph, when I do partial post back using a Update Panel and Timer, I call the method to add values to the session and it does it. public void messsagePercentStats(object sender, EventArgs args) { ... if (value >= lowtarg && value < Toptarg) { vProgressColor = "'#eaa600'"; } else if (value >= Toptarg) { vProgressColor = "'#86cf21'"; } Session.Add("vProgressColor", vProgressColor); Session.Add("vProgressPercentage", "["+value+"],["+remaining+"]"); } } I use the update panel to call the above method <asp:ScriptManager ID="smCharts" runat="server" /> <asp:UpdatePanel runat="server" ID="Holder" OnLoad="messsagePercentStats" UpdateMode="Conditional"> <ContentTemplate> <asp:Timer ID="Timer1" runat="server" Interval="5000" OnTick="Timer_Tick" /> and the timer_tick method is executed every 5 seconds protected void Timer_Tick(object sender, EventArgs args) { ScriptManager.RegisterStartupScript(this, this.GetType(), "key", "r.init();", true); ResponseMetric rm = new ResponseMetric(); Holder.Update(); } I use ScriptManager.RegisterStartupScript(this, this.GetType(), "key", "r.init();", true); to call the r.init() Java script method to draw the graph on post back and it works fine. Java Script: var r = { init : function(){ r = Raphael("pie"), data2 = [<%= Session["vProgressPercentage"] %>]; axisx = ["10%", "20%"]; r.g.txtattr.font = "12px 'Fontin Sans', Fontin-Sans, sans-serif"; r.g.barchart(80, 25, 100, 320, data2, { stacked: true, colors: [<%= Session["vProgressColor"] %>,'#fff'] }); axis2 = r.g.axis(94, 325, 280, 0, 100, 10, 1); } } window.onload = function () { r.init(); }; This Java Script is not getting the new value from the session, it uses the old value when the page was loaded. How can I change the code to make sure the JS uses the latest session value.

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• How to conver post code to city name, is there an API available? Thanks

  - by LingAi

  Hi, How to conver post code to city name, is there an API available? Thanks I really appreciate your help. Yours Ling

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