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  • Considerations when architecting an extensible application using MEF

    - by Dan Bryant
    I've begun experimenting with dependency injection (in particular, MEF) for one of my projects, which has a number of different extensibility points. I'm starting to get a feel for what I can do with MEF, but I'd like to hear from others who have more experience with the technology. A few specific cases: My main use case at the moment is exposing various singleton-like services that my extensions make use of. My Framework assembly exposes service interfaces and my Engine assembly contains concrete implementations. This works well, but I may not want to allow all of my extensions to have access to all of my services. Is there a good way within MEF to limit which particular imports I allow a newly instantiated extension to resolve? This particular application has extension objects that I repeatedly instantiate. I can import multiple types of Controllers and Machines, which are instantiated in different combinations for a Project. I couldn't find a good way to do this with MEF, so I'm doing my own type discovery and instantiation. Is there a good way to do this within MEF or other DI frameworks? I welcome input on any other things to watch out for or surprising capabilities you've discovered that have changed the way you architect.

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  • Best .NET blog engine

    - by James Newton-King
    I am thinking about switching my blog away from Community Server to something that is simpler and focuses more on just being a good blog. What are the different .NET blogging engines and which one do you recommend?

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  • RSS feed created with PHP only shows the title in the feed reader

    - by James Simpson
    I am using the following PHP code to generate the XML for an RSS feed, but it doesn't seem to be working correctly. No short description is displayed in the feed reader, all I see is the title of the article. Also, all of the articles say they were published at the same time. This is the first time I have tried to setup an RSS feed, so I'm sure I've made several stupid mistakes. $result = mysql_query("SELECT * FROM blog ORDER BY id DESC LIMIT 10"); $date = date(DATE_RFC822); header('Content-type: text/xml'); echo ("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"); echo ("<rss version=\"2.0\">\n"); echo ("<channel>\n"); echo ("<lastBuildDate>$date</lastBuildDate>\n"); echo ("<pubDate>$date</pubDate>\n"); echo ("<title>my website name</title>\n"); echo ("<description><![CDATA[the description]]></description>\n"); echo ("<link>http://my-domain.com</link>\n"); echo ("<language>en</language>\n"); $ch=100; while ($a = mysql_fetch_array($result)) { $headline = htmlentities(stripslashes($a['subject'])); $posturl = $a[perm_link]; $content = $a['post']; $date = date(DATE_RFC822, $a['posted']); echo ("<item>\n"); echo ("<title>$headline</title>\n"); echo ("<link>$posturl</link>\n"); echo ("<description><![CDATA[$content]]></description>\n"); echo ("<guid isPermaLink=\"true\">$posturl</guid>\n"); echo ("<pubDate>$date2</pubDate>\n"); echo ("</item>\n"); } echo ("</channel>\n"); echo ("</rss>\n");

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  • Issue with org.apache.commons.net.ftp.FTPClient listFiles()

    - by James P.
    The listFiles() method of org.apache.commons.net.ftp.FTPClient works fine with Filezilla server on 127.0.0.1 but returns null on the root directory of public FTP servers such as belnet.be. There is an identical question on the link below but enterRemotePassiveMode() doesn't seem to help. http://stackoverflow.com/questions/2339855/apache-commons-ftpclient-listfiles Could it be an issue with list parsing? If so, how can go about solving this?

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  • WCF web service Data Members defaulting to null

    - by James
    I am new to WCF and created a simple REST service to accept an order object (series of strings from XML file), insert that data into a database, and then return an order object that contains the results. To test the service I created a small web project and send over a stream created from an xml doc. The problem is that even though all of the items in the xml doc get placed into the stream, the service is nullifying some of them when it receives the data. For example lineItemId will have a value but shipment status will show null. I step through the xml creation and verify that all the values are being sent. However, if I clear the datamembers and change the names around, it can work. Any help would be appreciated. This is the interface code [ServiceContract] public interface IShipping { [OperationContract] [WebInvoke(Method = "POST", UriTemplate = "/Orders/UpdateOrderStatus/", BodyStyle=WebMessageBodyStyle.Bare)] ReturnOrder UpdateOrderStatus(Order order); } [DataContract] public class Order { [DataMember] public string lineItemId { get; set; } [DataMember] public string shipmentStatus { get; set; } [DataMember] public string trackingNumber { get; set; } [DataMember] public string shipmentDate { get; set; } [DataMember] public string delvryMethod { get; set; } [DataMember] public string shipmentCarrier { get; set; } } [DataContract] public class ReturnOrder { [DataMember(Name = "Result")] public string Result { get; set; } } This is what I'm using to send over an Order object: string lineId = txtLineItem.Text.Trim(); string status = txtDeliveryStatus.Text.Trim(); string TrackingNumber = "1x22-z4r32"; string theMethod = "Ground"; string carrier = "UPS"; string ShipmentDate = "04/27/2010"; XNamespace nsOrders = "http://tempuri.org/order"; XElement myDoc = new XElement(nsOrders + "Order", new XElement(nsOrders + "lineItemId", lineId), new XElement(nsOrders + "shipmentStatus", status), new XElement(nsOrders + "trackingNumber", TrackingNumber), new XElement(nsOrders + "delvryMethod", theMethod), new XElement(nsOrders + "shipmentCarrier", carrier), new XElement(nsOrders + "shipmentDate", ShipmentDate) ); HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://localhost:3587/Deposco.svc/wms/Orders/UpdateOrderStatus/"); request.Method = "POST"; request.ContentType = "application/xml"; try { request.ContentLength = myDoc.ToString().Length; StreamWriter sw = new StreamWriter(request.GetRequestStream()); sw.Write(myDoc); sw.Close(); using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) { StreamReader reader = new StreamReader(response.GetResponseStream()); string responseString = reader.ReadToEnd(); XDocument.Parse(responseString).Save(@"c:\DeposcoSvcWCF.xml"); } } catch (WebException wEx) { Stream errorStream = ((HttpWebResponse)wEx.Response).GetResponseStream(); string errorMsg = new StreamReader(errorStream).ReadToEnd(); }

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  • Windows Server 2008 on VPC (Host: Win 7)?

    - by Dan
    Is it possible to test Windows 2008 server via VPC when my host of a Windows 7 machine? I don't see anywhere where it says this is possible? The only VPC images (Windows 2008 R2) that I download from Microsoft state that the host machine must be Windows 2008. Is there an alternative?

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  • ACT Professional for Windows-Memory leak?

    - by Dan
    I have an ACT! professional for Windows V11.1, with the latest SQL service pack (SP3) and have an apparent memory leak on the server. After a restart the ACT! SQL instance (SQLSERVR) consumes almost all the available memory on the server, we have added more memory to the server (it is running under Hyper-V) but it continues to consume it all. I have not been able to connect to the SQL server instance using management studio in order to limit the amount of RAM it is allocated. Are there any potential solutions for this? or should I continue to restart the services?

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  • How can I get the dimensions of a drawn string without padding?

    - by Dan Herbert
    I'm trying to create an image with some text on it and I want the image's size to match the size of the rendered text. When I use System.Windows.Forms.TextRenderer.MeasureText(...) to measure the text, I get dimensions that include font padding. When the text is rendered, it seems to use the same padding. Is there any way to determine the size of a string of text and then render it without any padding? This is the code I've tried: // Measure the text dimensions var text = "Hello World"; var fontFamily = new Font("Arial", 30, FontStyle.Regular); var textColor = new SolidBrush(Color.Black); Size textSize = TextRenderer.MeasureText(text, fontFamily, Size.Empty, TextFormatFlags.NoPadding); // Render the text with the given dimensions Bitmap bmp = new Bitmap(textSize.Width, textSize.Height); Graphics g = Graphics.FromImage(bmp); g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit; g.DrawString(text, fontFamily, textColor, new PointF(0, 0)); bmp.Save("output.png", ImageFormat.Png); This is what currently gets rendered out: This is what I want to render: I also looked into Graphics.MeasureString(...), but that can only be used on an existing Graphics object. I want to know the size before creating the image. Also, calling Graphics.MeasureString(...) returns the same dimensions, so it doesn't help me any.

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  • Why would the VB.NET compiler think an interface isn't implemented when it is?

    - by Dan Tao
    I have this happen sometimes, particularly with the INotifyPropertyChanged interface in my experience but I have no idea if the problem is limited to that single interface (which would seem bizarre) or not. Let's say I have some code set up like this. There's an interface with a single event. A class implements that interface. It includes the event. Public Interface INotifyPropertyChanged Event PropertyChanged As PropertyChangedEventHandler End Interface Public Class Person Implements INotifyPropertyChanged Public Event PropertyChanged _ (ByVal sender As Object, ByVal e As PropertyChangedEventArgs) _ Implements INotifyPropertyChanged.PropertyChanged ' more code below ' End Class Every now and then, when I build my project, the compiler will suddenly start acting like the above code is broken. It will report that the Person class does not implement INotifyPropertyChanged because it doesn't have a PropertyChanged event; or it will say the PropertyChanged event can't implement INotifyPropertyChanged.PropertyChanged because their signatures don't match. This is weird enough as it is, but here's the weirdest part: if I just cut out the line starting with Event PropertyChanged and then paste it back in, the error goes away. The project builds. Does anybody have any clue what could be going on here?

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  • F# passing an operator with arguments to a function

    - by dan
    Can you pass in an operation like "divide by 2" or "subtract 1" using just a partially applied operator, where "add 1" looks like this: List.map ((+) 1) [1..5];; //equals [2..6] // instead of having to write: List.map (fun x-> x+1) [1..5] What's happening is 1 is being applied to (+) as it's first argument, and the list item is being applied as the second argument. For addition and multiplication, this argument ordering doesn't matter. Suppose I want to subtract 1 from every element (this will probably be a common beginners mistake): List.map ((-) 1) [1..5];; //equals [0 .. -4], the opposite of what we wanted 1 is applied to the (-) as its first argument, so instead of (list_item - 1), I get (1 - list_item). I can rewrite it as adding negative one instead of subtracting positive one: List.map ((+) -1) [1..5];; List.map (fun x -> x-1) [1..5];; // this works too I'm looking for a more expressive way to write it, something like ((-) _ 1), where _ denotes a placeholder, like in the Arc language. This would cause 1 to be the second argument to -, so in List.map, it would evaluate to list_item - 1. So if you wanted to map divide by 2 to the list, you could write: List.map ((/) _ 2) [2;4;6] //not real syntax, but would equal [1;2;3] List.map (fun x -> x/2) [2;4;6] //real syntax equivalent of the above Can this be done or do I have to use (fun x -> x/2)? It seems that the closest we can get to the placeholder syntax is to use a lambda with a named argument.

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  • JavaScript Intellisene Problem?

    - by James Wiseman
    I've got an issue with JavaScript intellisense in Visual Web Developer 2008, which I'm starting to believe is "just one of those things", but thought I'd ask here just to check. I have a file MyOtherFile.js with a function GetRandomNumber() defined like so: function GetRandomNumber() { /// <summary> /// Summary description for GetRandomNumber /// </summary> return Math.random(); } When I reference this from another file, screen.js (/// <reference path="MyOtherFile.js" />) I get the intellisense as expected with the summary text as above. If, however, I call the function GetRandomNumber from within its own file (MyOtherFile.js) then I don't get the sumamry description. Any thoughts? Thanks.

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  • How to get R to recognize your working directory as its working directory?

    - by Dan Goldstein
    I use R under Windows on several machines. I know you can set the working directory from within an R script, like this setwd("C:/Documents and Settings/username/My Documents/x/y/z") ... but then this breaks the portability of the script. It's also annoying to have to reverse all the slashes (since Windows gives you backslashes) Is there a way to start R in a particular working directory so that you don't need to do this at the script level?

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  • SQL 05 full-text query fails "Specified module could not be found."

    - by Dan Bailiff
    I'm running SQL 2005 on Windows XP. I have a database table that has full text searching enabled. I was able to build and even re-build the index. However, when I try to query it like this: Select * from fulltext_english WHERE CONTAINS(page_data, 'causes') I get this error: Msg 7619, Level 16, State 1, Line 1 The execution of a full-text query failed. "The specified module could not be found." Did I miss something on the install? Is this a dll issue? I've googled and binged for days and can't find anything similar to this message. Thanks!

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  • WPF datagrid bind to previous row's cell

    - by James Price
    Hi, I have a datagrid and one of the columns is going to be a checkbox column. To give the background, the checkbox is going to turn something on / off and each row in the datagrid is going to be for a differernt time (in time order, ascending). Is it possible for one row's checkbox to be bound to the state of the previous row? That way if somebody turns off at 10am it will continue to be turned off until such a time that it is turned on again. Hope that makes sense, any help would be great. Sure this sounds like something that should be do-able with databindings just not sure on the way to do it! Thanks.

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  • CakePHP form $options['options']

    - by James
    Hey! Total CakePHP noob here. This is sort of a two fold question. In a view that is used for adding user objects I would like to use a drop down (selection) field in the form. Each user belongs to a group so when I add a user I want a drop down that contains all of the groups that the user could possibly join. Currently the group_id field is a textfield. I know how to force it to be a selection field, but I don't know how to populate the selection with the names of the groups programmatically. The Current method: echo $form->input('group_id', array( '1' => 'NameOfGroup1', '2' => 'NameOfGroup2', '3' => 'NameOfGroup3') ); I want to generate the options array programmatically though. echo $form->input('group_id', $this->Group->find('list')); This doesn't work though. I get an error: Undefined property: View::$Group [APP/views/users/add.ctp, line 8] To me this means that I don't have access to the Group object from inside my user view. How can I accomplish this? Again, I want to do it programmatically so that it updates as I add groups or remove them.

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  • How do I close a database connection being used to produce a streaming result in a WCF service?

    - by Dan
    I have been unable to find any documentation on properly closing database connections in WCF service operations. I have a service that returns a streamed response through the following method. public virtual Message GetData() { string sqlString = BuildSqlString(); SqlConnection conn = Utils.GetConnection(); SqlCommand cmd = new SqlCommand(sqlString, conn); XmlReader xr = cmd.ExecuteXmlReader(); Message msg = Message.CreateMessage( OperationContext.Current.IncomingMessageVersion, GetResponseAction(), xr); return msg; } I cannot close the connection within the method or the streaming of the response message will be terminated. Since control returns to the WCF system after the completion of that method, I don't know how I can close that connection afterwards. Any suggestions or pointers to additional documentation would be appreciated.

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  • jQuery UI sortable issue with helper Y offset value being same as scroll offset on FireFox only

    - by James
    I have a problem with a jQuery UI 1.7.2 sortable list in Firefox, IE7-8 work fine. When I'm scrolled down a bit, the helper element seems to have an offset of the same height that I'm scrolled down from the mouse pointer which makes it impossible to see which item you originally started dragging. How do I fix this or work around the issue? If there is no fix what is a really good alternative drag-able plugin? Here are my initialization parameters for the sortable. $("#sortable").sortable( {placeholder: 'ui-state-highlight' } ); $("#sortable").disableSelection();

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  • How to synchronize SQL Server 2008 database with SQL Server 2005 database?

    - by James McFarland
    I am using VS 2008 Team Suite and SQL Server 2008 in my development environment. I am deploying to a shared-host website with shared-host SQL Server 2005. I want to push changes from my development environment to my production host. I tried using Data | Schema Compare... and it reports to me that it does not support SQL Server 2008. What do people use for this (Besides Red-Gate tools - I use those at my day job, and they rock...this is a volunteer thing for my son's school)? I am looking for something very inexpensive if not free.

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  • Zend framework currency validation

    - by Dan
    How can I validate (a form element in this case) to ensure that the value is a currency? Have looked at Zend_Validate_Float. Needs to check that value is between 0 and 2dp. Ideally locale-aware (as ZVF is) to allow for locale specific formatting (thousands, decimal as comma/dot) Would also want to extend to allow/disallow negative values And provide optional upper/lower limits. Is the key, as I can do 3. and 4. with a chain. Do I need regex?

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  • Custom iterator for a class based on two sets

    - by Dan Hook
    I have a class that contains two sets. They both contain the same key type but have different compare operations. I would like to provide an iterator for the class that iterates through the elements of both sets. I want to start with one set, then when I increment an iterator pointing to the last element of the first set, I want to go to the first element of the second set. How do I do this? I would like to preserve the bidirectional iterator semantics of std::set, but if it turns out that implementing a forward iterator is much easier, so be it. I'm willing to use the Boost Iterator library if that would help.

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  • .Net System.Net.HttpWebRequest & Authentication Cookies

    - by James
    I would like to know if the following is possible: As part of the PageLoad of an ASP.Net page request: Use HttpWebRequest (POST) to make a request to a forms authentication webpage of a different web application Examine the response to see if the authentication succeeded (identifiable if an authentication cookie has been set) If it fails, then finish the ASP.Net page request, which will display a message saying "couldn't auto-login" or some such thing If success, then instead of completing the ASP.Net page lifecycle, use "Response.Write" to send the response from the HttpWebRequest back to the browser (thus essentially displaying the webpage from the HttpWebRequest) If the above is possible, then, is there also a way to transfer the authentication cookie from the HttpWebResponse to the requesting browser? My gut feeling is probably not - but if this is the case, then how do proxy servers handle such things? Is that not essentially what they are doing? Thanks for any help

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  • How can I use geoalchemy with elixir autoload tables?

    - by Dan Ellis
    I'm using geoalchemy and autoloaded tables, but I'd like to use Elixir, because it has a nicer query syntax. Does anyone know how to get them to work together? I did get it working with this code -- http://pastie.textmate.org/private/y3biyvosuejkrtxbpdv1a -- but that still gives the ugly warning about not recognising the geometry column when the table is reflected. Ideally, what I'd like to do is to get SQLAlchemy's own table reflection to recognise the geometry columns. How would I plumb them together?

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  • Evaluating a regular expression range

    - by Dan Atkinson
    Hi there! Is there a nice way to evaluate a regular expression range, say, for a url such as http://example.com/[a-z]/[0-9].htm This would be converted into: http://example.com/a/0.htm http://example.com/a/1.htm http://example.com/a/2.htm ... http://example.com/a/9.htm ... http://example.com/z/0.htm http://example.com/z/1.htm http://example.com/z/2.htm ... http://example.com/z/9.htm I've been scratching my head about this, and there's no pretty way of doing it without going through the alphabet and looping through numbers. Thanks in advance!

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