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  • Performance of if statement versus switch statement

    - by behrk2
    Hi Everyone, I have an if statement with 16 cases (I am checking the state of four boolean variables). Would there be any value in trying to implement this differently, with nested switch statements perhaps? What is the actual performance gain of a switch statement over an if statement? Thanks!

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  • How to delete child object in NHibernate?

    - by Mark Struzinski
    I have a parent object which has a one to many relationship with an IList of child objects. What is the best way to delete the child objects? I am not deleting the parent. My parent object contains an IList of child objects. Here is the mapping for the one to many relationship: <bag name="Tiers" cascade="all"> <key column="mismatch_id_no" /> <one-to-many class="TGR_BL.PromoTier,TGR_BL"/> </bag> If I try to remove all objects from the collection using clear(), then call SaveOrUpdate(), I get this exception: System.Data.SqlClient.SqlException: Cannot insert the value NULL into column If I try to delete the child objects individually then remove them from the parent, I get an exception: deleted object would be re-saved by cascade This is my first time dealing with deleting child objects in NHibernate. What am I doing wrong? edit: Just to clarify - I'm NOT trying to delete the parent object, just the child objects. I have the relationship set up as a one to many on the parent. Do I also need to create a many-to-one relationship on the child object mapping?

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  • Difference in String concatenation performance

    - by Homer
    I know you should use a StringBuilder when concatenating strings but I was just wondering if there is a difference in concatenating string variables and string literals. So, is there a difference in performance in building s1, s2, and s3? string foo = "foo"; string bar = "bar"; string s1 = "foo" + "bar"; string s2 = foo + "bar"; string s3 = foo + bar;

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  • JS onclick triggers wrong object

    - by Clemens Prerovsky
    Hi guys, what I'm trying to do here is to associate a DOM object with an instance of a JS object, which will provide some meaningfol methods later on ;) At this point I just want to handle my JS object the click event, whilst keeping it's references intact. <?xml version="1.0" encoding="ISO-8859-1" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> <title>Insert title here</title> <script type="text/javascript"> // my object, which will hold a reference to a single DOM object obj = function(domobj) { this.o = domobj; my = this; var ref = my.click; this.o.onclick = ref; } // my objects click function obj.prototype.click = function() { alert(my.o.innerHTML); } // create objects with references $(document).ready(function() { o1 = new obj(document.getElementById('b1')); o2 = new obj(document.getElementById('b2')); }); </script> </head> <body> <button id="b1">button 1</button> <button id="b2">button 2</button> </body> </html> Expected result: when clicking on button 1, the text "button 1" should be alerted. Current result: when clicking button 1, the text "button 2" is alerted. What I found out so far is that the wrong instance of obj is triggered from the click event, even though o1 and o2 maintain correct references to their corresponding DOM object. Any ideas how to solve this? Thanks for your help! Best regards, Clemens

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  • Excel error HRESULT: 0x800A03EC while trying to get range with cell's name

    - by Teerasej
    I am working with Window Service project. that have to write data to a sheet in Excel file in a sequence times. But sometimes, just sometimes, the service throw out the exception "Exception from HRESULT: 0x800A03EC" while it's trying to get range with cell's name. I have put the code of opening excel sheet, and getting cell here. OS: window server 2003 Office: Microsoft Office 2003 sp2 1: Opening excel sheet m_WorkBook = m_WorkBooks.Open(this.FilePath, 0, false, 5, "", "", true, Excels.XlPlatform.xlWindows, ";", true, false, 0, true, 0, 0); 2: Getting cell to write protected object m_MissingValue = System.Reflection.Missing.Value; Range range = m_WorkSheet.get_Range(cell.CellName, m_MissingValue); // error from this method, and cell name is string.

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  • C# Generate MRTG/RRD like Graphs Performance graphs?

    - by BlackTea
    I have a database with Performance counter data and i would like to show this on a ASP.net page but the thing is i don't want to use Flash based charting solution or a Javascript based solution i would like to just generate images and use those I want the images to be like those of RRD or MRTG. I'm trying to find out how i can create graphs like the following http://oss.oetiker.ch/rrdtool/stream-pop.png http://oss.oetiker.ch/rrdtool/gallery/index.en.html Any ideas?

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  • Windows Form: showing child object value in the DataGridView

    - by Daoming Yang
    I have a productVariant object which has child product object. I want to show the value in the DataGridView, can anyone let me know how to do this? Here is the structure of the object. I tried to bind "ProductVariant.Product.Name" to the DataProptertyName in the DataGridView, however, it did not not showing any value. Can anyone help with this? Many thanks.

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  • What might cause the big overhead of making a HttpWebRequest call?

    - by Dimitri C.
    When I send/receive data using HttpWebRequest (on Silverlight, using the HTTP POST method) in small blocks, I measure the very small throughput of 500 bytes/s over a "localhost" connection. When sending the data in large blocks, I get 2 MB/s, which is some 5000 times faster. Does anyone know what could cause this incredibly big overhead? Update: I did the performance measurement on both Firefox 3.6 and Internet Explorer 7. Both showed similar results. Update: The Silverlight client-side code I use is essentially my own implementation of the WebClient class. The reason I wrote it is because I noticed the same performance problem with WebClient, and I thought that the HttpWebRequest would allow to tweak the performance issue. Regrettably, this did not work. The implementation is as follows: public class HttpCommChannel { public delegate void ResponseArrivedCallback(object requestContext, BinaryDataBuffer response); public HttpCommChannel(ResponseArrivedCallback responseArrivedCallback) { this.responseArrivedCallback = responseArrivedCallback; this.requestSentEvent = new ManualResetEvent(false); this.responseArrivedEvent = new ManualResetEvent(true); } public void MakeRequest(object requestContext, string url, BinaryDataBuffer requestPacket) { responseArrivedEvent.WaitOne(); responseArrivedEvent.Reset(); this.requestMsg = requestPacket; this.requestContext = requestContext; this.webRequest = WebRequest.Create(url) as HttpWebRequest; this.webRequest.AllowReadStreamBuffering = true; this.webRequest.ContentType = "text/plain"; this.webRequest.Method = "POST"; this.webRequest.BeginGetRequestStream(new AsyncCallback(this.GetRequestStreamCallback), null); this.requestSentEvent.WaitOne(); } void GetRequestStreamCallback(IAsyncResult asynchronousResult) { System.IO.Stream postStream = webRequest.EndGetRequestStream(asynchronousResult); postStream.Write(requestMsg.Data, 0, (int)requestMsg.Size); postStream.Close(); requestSentEvent.Set(); webRequest.BeginGetResponse(new AsyncCallback(this.GetResponseCallback), null); } void GetResponseCallback(IAsyncResult asynchronousResult) { HttpWebResponse response = (HttpWebResponse)webRequest.EndGetResponse(asynchronousResult); Stream streamResponse = response.GetResponseStream(); Dim.Ensure(streamResponse.CanRead); byte[] readData = new byte[streamResponse.Length]; Dim.Ensure(streamResponse.Read(readData, 0, (int)streamResponse.Length) == streamResponse.Length); streamResponse.Close(); response.Close(); webRequest = null; responseArrivedEvent.Set(); responseArrivedCallback(requestContext, new BinaryDataBuffer(readData)); } HttpWebRequest webRequest; ManualResetEvent requestSentEvent; BinaryDataBuffer requestMsg; object requestContext; ManualResetEvent responseArrivedEvent; ResponseArrivedCallback responseArrivedCallback; } I use this code to send data back and forth to an HTTP server.

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  • .net activeX object

    - by Ali YILDIRIM
    Hi, I am trying to use my .net image editor user control as an activeX object in a web form. After internet search, I created a asp.net web site from VS2008 and added the following code <object classid="res/ImageEditor.dll#ImageEditor.Editor" height="400" width="400" id="myControl1" name="myControl1" > </object> <INPUT id="Button1" type="button" value="Btn" name="Btn" onclick="return Button1_onclick()"> </script> <script language=javascript> function Button1_onclick() { alert(document.getElementById("myControl1").WatermarkText); } </script> I have two problems 1-) When i first create the project i see the user control on browser but, after rebuilding the user control and changing the dll file at web site, the object no more appears on browser. Instead i see something like an error image. 2-) i can not access public properties. The user control is marked as "make com visible", and register for com is checked at properties.

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  • How to select one object from a NSArray?

    - by 0SX
    First of all Merry Christmas to everyone!!! Currently I have a NSArray that has parsed content in it. When I do a NSLog of the array it prints out 20 objects with the parsed content that I needed. Like so: 2010-12-24 20:27:32.170 TestProject[48914:298] SomeContent 2010-12-24 20:27:32.172 TestProject[48914:298] SomeContent1 2010-12-24 20:27:32.172 TestProject[48914:298] SomeContent2 2010-12-24 20:27:32.173 TestProject[48914:298] SomeContent3 2010-12-24 20:27:32.173 TestProject[48914:298] SomeContent4 2010-12-24 20:27:32.173 TestProject[48914:298] SomeContent5 2010-12-24 20:27:32.174 TestProject[48914:298] SomeContent6 2010-12-24 20:27:32.175 TestProject[48914:298] SomeContent7 2010-12-24 20:27:32.176 TestProject[48914:298] SomeContent8 2010-12-24 20:27:32.176 TestProject[48914:298] SomeContent9 2010-12-24 20:27:32.177 TestProject[48914:298] SomeContent10 2010-12-24 20:27:32.177 TestProject[48914:298] SomeContent11 2010-12-24 20:27:32.177 TestProject[48914:298] SomeContent12 2010-12-24 20:27:32.179 TestProject[48914:298] SomeContent13 2010-12-24 20:27:32.179 TestProject[48914:298] SomeContent14 2010-12-24 20:27:32.180 TestProject[48914:298] SomeContent15 2010-12-24 20:27:32.180 TestProject[48914:298] SomeContent16 2010-12-24 20:27:32.181 TestProject[48914:298] SomeContent17 2010-12-24 20:27:32.181 TestProject[48914:298] SomeContent18 2010-12-24 20:27:32.190 TestProject[48914:298] SomeContent19 However, I don't need every object at once. I need to be able to pick out one object at a time so I can put each object into a string of it's own. If anyone knows a easier way to do this then what I'm trying to please let me know. Anyways, I need to be able to choose just one object depending on what object I need. For example, let's say I only need object #5 and not all the array, how can this be done so I can put it into a string? I'm thinking I might have to use the index feature but I'm not sure how to set it up properly. Here is my NSArray that I'm working with: NSArray* myArray = [document selectElements: @"div.someContent"]; NSMutableArray* results = [NSMutableArray array]; for (Element* element in myArray){ NSString* snipet = [element contentsSource]; [results addObject: snipet]; NSLog(@"%@", snipet); } NSLog(@"%i",myArray.count); I've already spent several hours trying to achieve this but my knowledge with array's is limited even with me reading the documentation. :-( Any help is much appreciated. Thanks

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  • Derby vs PostgreSql Performance Comparison

    - by Austin
    We are doing research right now on whether to switch our postgresql db to an embedded Derby db. Both would be using glassfish 3 for our data layer. Anybody have any opinions or knowledge that could help us decide? Thanks! edit: we are writing some performance tests ourselves right now. Looking for answers more based on experience / first hand knowledge

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  • Should i repeat person name in alt text of <img> if name is already in source under image?

    - by metal-gear-solid
    if I'm already having person name under/over image then should i use same name in ALT text? <p><img width="125" height="157" alt="George Washington" src="media/gw.jpg"><span>George Washington</span><p> <p><span>George Washington</span> <img width="125" height="157" alt="George Washington" src="media/gw.jpg"><p> Should i repeat <span> in alt in both condition ? image has no link.

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  • how to assign an object to smarty templates?

    - by keisimone
    i created a model object in PHP class User { public $title; public function changeTitle($newTitle){ $this->title = $newTitle; } } How do i expose the property of a User object in smarty just by assigning the object? I know i can do this $smarty->assign('title', $user->title); but my object has something like over 20 plus properties. Please advise. EDIT 1 the following didn't work for me. $smarty->assign('user', $user); OR $smarty->register_object('user', $user); then i try to {$user->title} nothing came out. Thank you.

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  • Maintaining both sides of self-referential many-to-many relationship in Grails domain object

    - by Ali G
    I'm having some problems getting a many-to-many relationship working in grails. Is there anything obviously wrong with the following: class Person { static hasMany = [friends: Person] static mappedBy = [friends: 'friends'] String name List friends = [] String toString() { return this.name } } class BootStrap { def init = { servletContext -> Person bob = new Person(name: 'bob').save() Person jaq = new Person(name: 'jaq').save() jaq.friends << bob println "Bob's friends: ${bob.friends}" println "Jaq's friends: ${jaq.friends}" } } I'd expect Bob to be friends with Jaq and vice-versa, but I get the following output at startup: Running Grails application.. Bob's friends: [] Jaq's friends: [Bob] (I'm using Grails 1.2.0)

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  • Javascript: Calling a function written in an anonymous function from String with the function's name

    - by Kai barry yuzanic
    Hello. I've started using jQuery and am wondering how to call functions in an anonymous function dynamically from String. Let's say for instance, I have the following functions: function foo() { // Being in the global namespace, // this function can be called with window['foo']() alert("foo"); } jQuery(document).ready(function(){ function bar() { // How can this function be called // by using a String of the function's name 'bar'?? alert("bar"); } // I want to call the function bar here from String with the name 'bar' } I've been trying to figure out what could be the counterpart of 'window', which can call functions from the global namespace such as window["foo"]. In the small example above, how I can call the function bar from a String "bar"? Thank you for your help.

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  • SharePoint SPListItem.ContentType.Name - "Message" vs "Discussion" ?

    - by Christopher
    I am writing a C# code to find all of our SharePoint Sites that have emails contained in the Email List page. It appears that some of our email messages are SPListItem.ContentType.Name = "Message" and some of our email messages are SPListItem.ContentType.Name = "Discussion" Aside from the confusion, this is forcing my to cycle through mylist.Folders and mylist.Items in two separate loops, so that I don't miss any of the emails. Is this normal? Any idea why this could be happening? There are threads that contains messages of both types.

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  • .NET: Serializing object to a file from a 3rd party assembly

    - by MacGyver
    Below is a link that describes how to serialize an object. But it requires you implement from ISerializable for the object you are serializing. What I'd like to do is serialize an object that I did not define--an object based on a class in a 3rd party assembly (from a project reference) that is not implementing ISerializable. Is that possible? How can this be done? http://www.switchonthecode.com/tutorials/csharp-tutorial-serialize-objects-to-a-file Property (IWebDriver = interface type): private IWebDriver driver; Object Instance (FireFoxDriver is a class type): driver = new FirefoxDriver(firefoxProfile); ================ 3/21/2012 update after answer posted Why would this throw an error? It doesn't like this line: serializedObject.DriverInstance = (FirefoxDriver)driver; ... Error: Cannot implicitly convert type 'OpenQA.Selenium.IWebDriver' to 'OpenQA.Selenium.Firefox.FirefoxDriver'. An explicit conversion exists (are you missing a cast?) Here is the code: FirefoxDriverSerialized serializedObject = new FirefoxDriverSerialized(); Serializer serializer = new Serializer(); serializedObject = serializer.DeSerializeObject(@"C:\firefoxDriver.qa"); driver = serializedObject.DriverInstance; if (driver == null) { driver = new FirefoxDriver(firefoxProfile); serializedObject.DriverInstance = (FirefoxDriverSerialized)driver; serializer.SerializeObject(@"C:\firefoxDriver.qa", serializedObject); } Here are the two Serializer classes I built: public class Serializer { public Serializer() { } public void SerializeObject(string filename, FirefoxDriverSerialized objectToSerialize) { Stream stream = File.Open(filename, FileMode.Create); BinaryFormatter bFormatter = new BinaryFormatter(); bFormatter.Serialize(stream, objectToSerialize); stream.Close(); } public FirefoxDriverSerialized DeSerializeObject(string filename) { FirefoxDriverSerialized objectToSerialize; Stream stream = File.Open(filename, FileMode.Open); BinaryFormatter bFormatter = new BinaryFormatter(); objectToSerialize = (FirefoxDriverSerialized)bFormatter.Deserialize(stream); stream.Close(); return objectToSerialize; } } [Serializable()] public class FirefoxDriverSerialized : FirefoxDriver, ISerializable { private FirefoxDriver driverInstance; public FirefoxDriver DriverInstance { get { return this.driverInstance; } set { this.driverInstance = value; } } public FirefoxDriverSerialized() { } public FirefoxDriverSerialized(SerializationInfo info, StreamingContext ctxt) { this.driverInstance = (FirefoxDriver)info.GetValue("DriverInstance", typeof(FirefoxDriver)); } public void GetObjectData(SerializationInfo info, StreamingContext ctxt) { info.AddValue("DriverInstance", this.driverInstance); } } ================= 3/23/2012 update #2 - fixed serialization/de-serialization, but having another issue (might be relevant for new question) This fixed the calling code. Because we're deleting the *.qa file when we call the WebDriver.Quit() because that's when we chose to close the browser. This will kill off our cached driver as well. So if we start with a new browser window, we'll hit the catch block and create a new instance and save it to our *.qa file (in the serialized form). FirefoxDriverSerialized serializedObject = new FirefoxDriverSerialized(); Serializer serializer = new Serializer(); try { serializedObject = serializer.DeSerializeObject(@"C:\firefoxDriver.qa"); driver = serializedObject.DriverInstance; } catch { driver = new FirefoxDriver(firefoxProfile); serializedObject = new FirefoxDriverSerialized(); serializedObject.DriverInstance = (FirefoxDriver)driver; serializer.SerializeObject(@"C:\firefoxDriver.qa", serializedObject); } However, still getting this exception: Acu.QA.Main.Test_0055_GiftCertificate_UserCheckout: SetUp : System.Runtime.Serialization.SerializationException : Type 'OpenQA.Selenium.Firefox.FirefoxDriver' in Assembly 'WebDriver, Version=2.16.0.0, Culture=neutral, PublicKeyToken=1c2bd1631853048f' is not marked as serializable. TearDown : System.NullReferenceException : Object reference not set to an instance of an object. The 3rd line in this code block is throwing the exception: public void SerializeObject(string filename, FirefoxDriverSerialized objectToSerialize) { Stream stream = File.Open(filename, FileMode.Create); BinaryFormatter bFormatter = new BinaryFormatter(); bFormatter.Serialize(stream, objectToSerialize); // <=== this line stream.Close(); }

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  • How does Garbage Collection in Java work?

    - by Bright010957
    I was wondering how the garbage collector in Java deals with the following situation. Object A has a reference to Object B and Object B has a reference to Object C. The main program has a reference to Object A. So you can use Object B trough Object A, and Object C trough Object B trough Object A. What happens to Object B and Object C, if the link between Object A and Object B is set to null? Should Object B and Object C now been collected by the Garbage Collector? I mean there is still a connection between Object B and Object C.

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  • Html helper to show display name attribute without label

    - by Pedre
    I have this: [Display(Name = "Empresa")] public string Company{ get; set; } In my aspx I have: <th><%: Html.LabelFor(model => model.Company)%></th> And this generates: <th><label for="Company">Empresa</label></th> Are there any html helper extensions to only show the display attribute without label, only plain text? My desired output is this: <th>Empresa</th> Thanks! EDIT I tried DisplayFor or DisplayTextFor as suggested, but they are not valid because they generate: <th>Amazon</th> They return the value of the property... I want the name from the Display attribute.

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  • Variables versus constants versus associative arrays in PHP

    - by susmits
    I'm working on a small project, and need to implement internationalization support somehow. I am thinking along the lines of using constants to define a lot of symbols for text in one file, which could be included subsequently. However, I'm not sure if using variables is faster, or if I can get away with using associative arrays without too much of a performance hit. What's better for defining constant values in PHP, performance-wise -- constants defined using define("FOO", "..."), or simple variables like $foo = "...", or associative arrays like $symbols["FOO"]?

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  • How to implement Object Databases in Asp.net MVC

    - by amexn
    I started my project in Asp.net MVC(c#) & SQL Server 2005.I want to implement Object Databases in my project. While searched in google i found "MongoDb" & db4o I didn't have enough knowledge in Object Databases & which one best suited for SQL Server 2005. Please suggest a good example/reference regarding Object Databases implementation in Asp.net MVC application

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