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• I made a 2D ENGINE for Android, looking for cooperation.

  - by Roger Travis

  My name is Robert, I am an Android programmer and wanted to show off my latest project - a 2d game engine. You can see it in action here - https://play.google.com/store/apps/details?id=engineDemo.com My engine's main advantage is its ease of use. To have your level up and running, you'll need only 3 lines of code. ABoxView aboxView = new ABoxView(this); setContentView(aboxView); aboxView.loadLevel("level/level02"); Level are created in a special level constructor and object physical properties are stored in a corresponding XML file. I am looking to cooperate with those, who might be interesting in using my engine in their games. You can email me at [email protected] or post here. Thanks, Robert

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• Defining InputBindings within a Style

  - by Brent

  I'm creating a WPF app using the MVVM design pattern, and I'm trying to extend the TabItem control so that it closes the tab when the user clicks the middle mouse button. I'm trying to achieve this using InputBindings, and it works very well until I try to define it within a style. I've learned that you cannot add InputBindings to a style unless you attach it using a DependencyProperty. So I followed this similar post here... and it works... almost. I can close one tab using the middle mouse button, but it won't work on any of the other tabs (all of the tabs are added at runtime and inherit the same style). So I need some help. Why would this only be working the first time, and not after? Obviously I could create a custom control that inherits from a TabItem and make it work, but I'd like to figure this out as I can see this being expanded in my projects. I'm no expert on DependencyProperties, so please help me out. Thanks! Style: <Style TargetType="{x:Type TabItem}"> <Setter Property="w:Attach.InputBindings"> <Setter.Value> <InputBindingCollection> <MouseBinding MouseAction="MiddleClick" Command="{Binding CloseCommand}"/> </InputBindingCollection> </Setter.Value> </Setter> ... </Style> Class public class Attach { public static readonly DependencyProperty InputBindingsProperty = DependencyProperty.RegisterAttached("InputBindings", typeof(InputBindingCollection), typeof(Attach), new FrameworkPropertyMetadata(new InputBindingCollection(), (sender, e) => { var element = sender as UIElement; if (element == null) return; element.InputBindings.Clear(); element.InputBindings.AddRange((InputBindingCollection)e.NewValue); })); public static InputBindingCollection GetInputBindings(UIElement element) { return (InputBindingCollection)element.GetValue(InputBindingsProperty); } public static void SetInputBindings(UIElement element, InputBindingCollection inputBindings) { element.SetValue(InputBindingsProperty, inputBindings); } }

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• Configure IIS 7.0 to enable webservices in classic mode

  - by intermension

  What are the configuration file settings to enable webservices on IIS 7.0 in classic mode? The site has to be in a classic mode application pool because the Report Viewer controls crash when running in Integrated Mode. However in a classic mode application pool, webservices produce the following error message: The requested content appears to be script and will not be served by the static file handler. •If you want to serve this content as a static file, add an explicit MIME map EDIT - Additional Error Message Info: HTTP Error 404.17 - Not Found Module: StaticFileModule Notification: ExecuteRequestHandler Handler: StaticFile Error Code: 0x80070032 Note: This particular instance of the application will be running in a customers account on a shared hosting enviroment so access to IIS UI is not/will not be available. Specifically seeking configuration file adjustments.

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• .NET 1.0 ThreadPool Question

  - by dotnet-practitioner

  I am trying to spawn a thread to take care of DoWork task that should take less than 3 seconds. Inside DoWork its taking 15 seconds. I want to abort DoWork and transfer the control back to main thread. I have copied the code as follows and its not working. Instead of aborting DoWork, it still finishes DoWork and then transfers the control back to main thread. What am I doing wrong? class Class1 { /// <summary> /// The main entry point for the application. /// </summary> /// private static System.Threading.ManualResetEvent[] resetEvents; [STAThread] static void Main(string[] args) { resetEvents = new ManualResetEvent[1]; int i = 0; resetEvents[i] = new ManualResetEvent(false); ThreadPool.QueueUserWorkItem(new WaitCallback(DoWork),(object)i); Thread.CurrentThread.Name = "main thread"; Console.WriteLine("[{0}] waiting in the main method", Thread.CurrentThread.Name); DateTime start = DateTime.Now; DateTime end ; TimeSpan span = DateTime.Now.Subtract(start); //abort dowork method if it takes more than 3 seconds //and transfer control to the main thread. do { if (span.Seconds < 3) WaitHandle.WaitAll(resetEvents); else resetEvents[0].Set(); end = DateTime.Now; span = end.Subtract(start); }while (span.Seconds < 2); Console.WriteLine(span.Seconds); Console.WriteLine("[{0}] all done in the main method",Thread.CurrentThread.Name); Console.ReadLine(); } static void DoWork(object o) { int index = (int)o; Thread.CurrentThread.Name = "do work thread"; //simulate heavy duty work. Thread.Sleep(15000); //work is done.. resetEvents[index].Set(); Console.WriteLine("[{0}] do work finished",Thread.CurrentThread.Name); } }

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• Opposite method of math power adding numbers

  - by adopilot

  I have method for converting array of Booleans to integer. It looks like this class Program { public static int GivMeInt(bool[] outputs) { int data = 0; for (int i = 0; i < 8; i++) { data += ((outputs[i] == true) ? Convert.ToInt32(Math.Pow(2, i)) : 0); } return data; } static void Main(string[] args) { bool[] outputs = new bool[8]; outputs[0] = false; outputs[1] = true; outputs[2] = false; outputs[3] = true; outputs[4] = false; outputs[5] = false; outputs[6] = false; outputs[7] = false; int data = GivMeInt(outputs); Console.WriteLine(data); Console.ReadKey(); } } Now I want to make opposite method returning array of Booleans values As I am short with knowledge of .NET and C# until now I have only my mind hardcoding of switch statement or if conditions for every possible int value. public static bool[] GiveMeBool(int data) { bool[] outputs = new bool[8]; if (data == 0) { outputs[0] = false; outputs[1] = false; outputs[2] = false; outputs[3] = false; outputs[4] = false; outputs[5] = false; outputs[6] = false; outputs[7] = false; } //After thousand lines of coed if (data == 255) { outputs[0] = true; outputs[1] = true; outputs[2] = true; outputs[3] = true; outputs[4] = true; outputs[5] = true; outputs[6] = true; outputs[7] = true; } return outputs; } I know that there must be easier way.

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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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• Getting problem in accessing web cam.

  - by Chetan

  Hi... I have written code in Java to access web cam,and to save image... I am getting following exceptions : Exception in thread "main" java.lang.NullPointerException at SwingCapture.(SwingCapture.java:40) at SwingCapture.main(SwingCapture.java:66) how to remove this exceptions. here is the code: import javax.swing.*; import javax.swing.event.; import java.io.; import javax.media.; import javax.media.format.; import javax.media.util.; import javax.media.control.; import javax.media.protocol.; import java.util.; import java.awt.; import java.awt.image.; import java.awt.event.; import com.sun.image.codec.jpeg.; public class SwingCapture extends Panel implements ActionListener { public static Player player = null; public CaptureDeviceInfo di = null; public MediaLocator ml = null; public JButton capture = null; public Buffer buf = null; public Image img = null; public VideoFormat vf = null; public BufferToImage btoi = null; public ImagePanel imgpanel = null; public SwingCapture() { setLayout(new BorderLayout()); setSize(320,550); imgpanel = new ImagePanel(); capture = new JButton("Capture"); capture.addActionListener(this); String str1 = "vfw:iNTEX IT-308 WC:0"; String str2 = "vfw:Microsoft WDM Image Capture (Win32):0"; di = CaptureDeviceManager.getDevice(str2); ml = di.getLocator(); try { player = Manager.createRealizedPlayer(ml); player.start(); Component comp; if ((comp = player.getVisualComponent()) != null) { add(comp,BorderLayout.NORTH); } add(capture,BorderLayout.CENTER); add(imgpanel,BorderLayout.SOUTH); } catch (Exception e) { e.printStackTrace(); } } public static void main(String[] args) { Frame f = new Frame("SwingCapture"); SwingCapture cf = new SwingCapture(); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { playerclose(); System.exit(0);}}); f.add("Center",cf); f.pack(); f.setSize(new Dimension(320,550)); f.setVisible(true); } public static void playerclose() { player.close(); player.deallocate(); } public void actionPerformed(ActionEvent e) { JComponent c = (JComponent) e.getSource(); if (c == capture) { // Grab a frame FrameGrabbingControl fgc = (FrameGrabbingControl) player.getControl("javax.media.control.FrameGrabbingControl"); buf = fgc.grabFrame(); // Convert it to an image btoi = new BufferToImage((VideoFormat)buf.getFormat()); img = btoi.createImage(buf); // show the image imgpanel.setImage(img); // save image saveJPG(img,"\test.jpg"); } } class ImagePanel extends Panel { public Image myimg = null; public ImagePanel() { setLayout(null); setSize(320,240); } public void setImage(Image img) { this.myimg = img; repaint(); } public void paint(Graphics g) { if (myimg != null) { g.drawImage(myimg, 0, 0, this); } } } public static void saveJPG(Image img, String s) { BufferedImage bi = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_RGB); Graphics2D g2 = bi.createGraphics(); g2.drawImage(img, null, null); FileOutputStream out = null; try { out = new FileOutputStream(s); } catch (java.io.FileNotFoundException io) { System.out.println("File Not Found"); } JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi); param.setQuality(0.5f,false); encoder.setJPEGEncodeParam(param); try { encoder.encode(bi); out.close(); } catch (java.io.IOException io) { System.out.println("IOException"); } } }

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• IE6 Hacks: Getting jQuery tools expose to work properly on my site

  - by Wild Thing

  Hi, I am trying to get the jQuery tools 'expose' function to work properly in IE6. The page is http://204.51.246.10:12123/ You will need IE6 to reproduce the bug (obviously :)). If you click 'Sign In' on the top-right corner (below the 'Join Today!' button), you will notice that the sign in panel (fieldset#login-controls) is getting covered by the background of its parent element (.signinPanel), which is very weird. It is not on the top of z-index, and I can't figure out why. Please note that in order to get fieldset#login-controls positioned correctly, I have applied the following hack for IE6: $("#header, #header div, #header table, #header td, #header tr").css("position", "static"); $("fieldset#login-controls *").css("position", "static"); This might be the reason for the above. I am pretty lost at this point, as I can't figure what's going on - any advise would be appreciated. Cheers, Wild Thing

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• ICommand.CanExecute being passed null even though CommandParameter is set...

  - by chaiguy

  I have a tricky problem where I am binding a ContextMenu to a set of ICommand-derived objects, and setting the Command and CommandParameter properties on each MenuItem via a style: <ContextMenu ItemsSource="{Binding Source={x:Static OrangeNote:Note.MultiCommands}}"> <ContextMenu.Resources> <Style TargetType="MenuItem"> <Setter Property="Header" Value="{Binding Path=Title}" /> <Setter Property="Command" Value="{Binding}" /> <Setter Property="CommandParameter" Value="{Binding Source={x:Static OrangeNote:App.Screen}, Path=SelectedNotes}" /> ... However, while ICommand.Execute( object ) gets passed the set of selected notes as it should, ICommand.CanExecute( object ) (which is called when the menu is created) is getting passed null. I've checked and the selected notes collection is properly instantiated before the call is made (in fact it's assigned a value in its declaration, so it is never null). I can't figure out why CanEvaluate is getting passed null.

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• ASP.Net MVC view unable to see HtmlHelper extension method

  - by larryq

  Hi everyone, We're going through an ASP.Net MVC book and are having trouble with using an extenstion method within our view. The Extension method looks like this: using System; using System.Runtime.CompilerServices; using System.Web.Mvc; namespace MvcBookApplication { public static class HtmlHelperExtensions { public static string JQueryGenerator(this HtmlHelper htmlHelper, string formName, object model); } } We use the extension method in our view like this: <%=Html.JQueryGenerator("createmessage", ViewData.Model)%> The problem is, that line of code says JQueryGenerator isn't a recognized method of HtmlHelper. I believe we've got the correct references set in the web project, but are there other things we can check? There's no using statement for views, is there?

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• XAML trigger as StaticResource

  - by adrianm

  Why can't I create a trigger and use it as a static resource in XAML? <Window.Resources> <Trigger x:Key="ValidationTrigger" x:Shared="False" Property="Validation.HasError" Value="true"> <Setter Property="FrameworkElement.ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors)/ErrorContent}"/> </Trigger> <Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource {x:Type TextBox}}"> <Style.Triggers> <StaticResource ResourceKey="ValidationTrigger"/> </Style.Triggers> </Style> </Window.Resources> I get an errormessage at runtime "Value cannot be null. Parameter name: triggerBase Error at object 'System.Windows.Markup.StaticResourceHolder' in markup file"

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• Java - short and casting

  - by chr1s

  Hi all, I have the following code snippet. public static void main(String[] args) { short a = 4; short b = 5; short c = 5 + 4; short d = a; short e = a + b; // does not compile (expression treated as int) short z = 32767; short z_ = 32768; // does not compile (out of range) test(a); test(7); // does not compile (not applicable for arg int) } public static void test(short x) { } Is the following summary correct (with regard to only the example above using short)? direct initializations without casting is only possible using literals or single variables (as long as the value is in the range of the declared type) if the rhs of an assignment deals with expressions using variables, casting is necessary But why exactly do I need to cast the argument of the second method call taking into account the previous summary?

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• WPF WIN32 hwndhost WM_MOUSEMOVE WM_MOUSEHOVER

  - by Neil B

  I have a WPF app with a usercontrol that contains a HwndHost. The HwndHost is created as follows: hwndHost = CreateWindowEx(0, "static", "", WS_CHILD | WS_VISIBLE, 0, 0, hostHeight, hostWidth, hwndParent.Handle, (IntPtr)HOST_ID, IntPtr.Zero, 0); hwndControl = CreateWindowEx(0, "Static", "", WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN , 0, 0, hostHeight, hostWidth, hwndHost, (IntPtr)PICTUREBOX_ID, IntPtr.Zero, 0); I then hook into the message pump using HwndSourceHook and loads of messages come through. Except the ones I want i.e. WM_MOUSEMOVE, WM_MOUSEHOVER, WM_LBUTTONDOWN and WM_LBUTTONUP Also the OnMouseLeftButtonDown event is not fired in the WPF code on the main window or the control, I assume because windows is trapping it and throwing it away. Anybody know how I can get these to come through, either with or without using the WIN32 window messages?

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• What does it take to prove this Contract.Requires?

  - by John Gietzen

  I have an application that runs through the rounds in a tournament, and I am getting a contract warning on this simplified code structure: public static void LoadState(IList<Object> stuff) { for(int i = 0; i < stuff.Count; i++) { // Contract.Assert(i < stuff.Count); // Contract.Assume(i < stuff.Count); Object thing = stuff[i]; Console.WriteLine(thing.ToString()); } } The warning is: contracts: requires unproven: index < @this.Count What am I doing wrong? How can I prove this on an IList<T>? Is this a bug in the static analyzer? How would I submit a bug report to Microsoft?

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• How to display image in grails GSP?

  - by Walter

  I'm still learning Grails and seem to have hit a stumbling block. Here are the 2 domain classes: class Photo { byte[] file static belongsTo = Profile } class Profile { String fullName Set photos static hasMany = [photos:Photo] } The relevant controller snippet: class PhotoController { ..... def viewImage = { def photo = Photo.get( params.id ) byte[] image = photo.file response.outputStream << image } ...... } Finally the GSP snippet: <img class="Photo" src="${createLink(controller:'photo', action:'viewImage', id:'profileInstance.photos.get(1).id')}" /> Now how do I access the photo so that it will be shown on the GSP? I'm pretty sure that profileInstance.photos.get(1).id is not correct. Thanks!!

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• What's the convention for extending Linq with set based helper operations

  - by Luke Rohde

  Hi All I might be vaguing out here but I'm looking for a nice place to put set based helper operations in linq so I can do things like; db.Selections.ClearTemporary() which does something like db.DeleteAllOnSubmit(db.Selections.Where(s => s.Temporary)) Since I can figure out how to extend Table<Selection> the best I can do is create a static method in partial class of Selection (similar to Ruby) but I have to pass in the datacontext like; Selection.ClearTemporary(MyDataContext) This kind of sucks because I have two conventions for doing set based operations and I have to pass the data context to the static class. I've seen other people recommending piling helper methods into a partial of the datacontext like; myDataContext.ClearTemporarySelections(); But I feel this makes the dc a dumping ground for in-cohesive operations. Surely I'm missing something. I hope so. What's the convention? TIA

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• How to dispose NHibernate ISession in an ASP.NET MVC App

  - by Joe Young

  I have NHibernate hooked up in my asp.net mvc app. Everything works fine, if I DON'T dispose the ISession. I have read however that you should dispose, but when I do, I get random "Session is closed" exceptions. I am injecting the ISession into my other objects with Windsor. Here is my current NHModule: public class NHibernateHttpModule : IHttpModule { public void Init(HttpApplication context) { context.BeginRequest += context_BeginRequest; context.EndRequest += context_EndRequest; } static void context_EndRequest(object sender, EventArgs e) { CurrentSessionContext.Unbind(MvcApplication.SessionFactory); } static void context_BeginRequest(object sender, EventArgs e) { CurrentSessionContext.Bind(MvcApplication.SessionFactory.OpenSession()); } public void Dispose() { // do nothing } } Registering the ISession: container .Register(Component.For<ISession>() .UsingFactoryMethod(() => MvcApplication.SessionFactory.GetCurrentSession()).LifeStyle.Transient); The error happens when I tack the Dispose on the unbind in the module. Since I keep getting the session is closed error I assume this is not the correct way to do this, so what is the correct way? Thanks, Joe

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• How to programmatically answer "Yes" to WebBrowser control security alert

  - by ih8ie8

  I am using WebBrowser control to programmatically access a single website, but whenever I login, I receive this certificate security alert: Since I trust that website and since I need to programmatically automate the login as well, this dialog box gets in the way. I searched SO for a solution and found a question similar to mine, but the accepted answer does not work! I defined a static member in the form that contains the WebControl: public static bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true; } In my form's constructor I added: ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(ValidateServerCertificate); But that didn't get rid of the certificate security alert. Is there any way to get rid of this warning? Is there an IE equivalent to Firefox's Add Security Exception??? Note: The owner's certificate works perfectly fine (without exhibiting this security alert) with standalone browsers (IE, FF, Chrome, Safari). It only exhibits the problem with the WebBroswer control.

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• Trying to change variables in a singleton using a method

  - by Johnny Cox

  I am trying to use a singleton to store variables that will be used across multiple view controllers. I need to be able to get the variables and also set them. How do I call a method in a singleton to change the variables stored in the singleton. total+=1079; [var setTotal:total]; where var is a static Singleton *var = nil; I need to update the total and send to the setTotal method inside the singleton. But when I do this the setTotal method never gets accessed. The get methods work but the setTotal method does not. Please let me know what should. Below is some of my source code // // Singleton.m // Rolo // // Created by on 6/28/12. // Copyright (c) 2012 Johnny Cox. All rights reserved. // #import "Singleton.h" @implementation Singleton @synthesize total,tax,final; #pragma mark Singleton Methods + (Singleton *)sharedManager { static Singleton *sharedInstance = nil; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ sharedInstance = [[Singleton alloc] init]; // Do any other initialisation stuff here }); return sharedInstance; } +(void) setTotal:(double) tot { Singleton *shared = [Singleton sharedManager]; shared.total = tot; NSLog(@"hello"); } +(double) getTotal { Singleton *shared = [Singleton sharedManager]; NSLog(@"%f",shared.total); return shared.total; } +(double) getTax { Singleton *shared = [Singleton sharedManager]; NSLog(@"%f",shared.tax); return shared.tax; } @end // // Singleton.h // Rolo // // Created by on 6/28/12. // Copyright (c) 2012 Johnny Cox. All rights reserved. // #import <Foundation/Foundation.h> @interface Singleton : NSObject @property (nonatomic, assign) double total; @property (nonatomic, assign) double tax; @property (nonatomic, assign) double final; + (id)sharedManager; +(double) getTotal; +(void) setTotal; +(double) getTax; @end

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• Is this good C# style?

  - by burnt1ce

  Consider the following method signature: public static bool TryGetPolls(out List<Poll> polls, out string errorMessage) This method performs the following: accesses the database to generate a list of Poll objects. returns true if it was success and errorMessage will be an empty string returns false if it was not successful and errorMessage will contain an exception message. Is this good style? Update: Lets say i do use the following method signature: public static List<Poll> GetPolls() and in that method, it doesn't catch any exceptions (so i depend the caller to catch exceptions). How do i dispose and close all the objects that is in the scope of that method? As soon as an exception is thrown, the code that closes and disposes objects in the method is no longer reachable.

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• .NET sendkeys to calculator

  - by user203123

  The sendkeys code below works well for Notepad but it doesn't work for Calculator. What is the problem? (It's another problem compared to what I sent here http://stackoverflow.com/questions/2604486/c-sendkeys-problem) [DllImport("user32.dll", CharSet = CharSet.Unicode)] public static extern IntPtr FindWindow(string lpClassName,string lpWindowName); [DllImport("User32")] public static extern bool SetForegroundWindow(IntPtr hWnd); private void button1_Click(object sender, EventArgs e) { IntPtr calculatorHandle = FindWindow("SciCalc", "Calculator"); //IntPtr calculatorHandle = FindWindow("Notepad", "Untitled - Notepad"); if (calculatorHandle == IntPtr.Zero) { MessageBox.Show("Calculator is not running."); return; } SetForegroundWindow(calculatorHandle); System.Threading.Thread.Sleep(1000); SendKeys.SendWait("111*11="); //SendKeys.SendWait("{ENTER}"); //cnt++; SendKeys.Flush(); }

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• C# GridView dynamically built columns with textboxes ontextchanged

  - by tnriverfish

  My page is a bulk order form that has many products and various size options. I've got a gridview that has a 3 static columns with labels. There are then some dynamically built columns. Each of the dynamically built columns have a textbox in them. The textbox is for quantity. Trying to either update the server with the quantity entered each time a textbox is changed (possibly ontextchanged event) or loop though each of the rows column by column and gather all the items that have a quantity and process those items and their quantities all at once (via button onclick). If I put the process that builds the GridView behind a if(!Page.IsPostBack) then the when a textchanged event fires the gridview only gets the static fields and the dynamic ones are gone. If I remove the if(!Page.IsPostBack) the process to gather and build the page is too heavy on processing and takes too long to render the page again. Some advice would be appreciated. Thanks

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• Objective C message dispatch mechanism

  - by Dolphin

  I am just staring to play around with Objective C (writing toy iPhone apps) and I am curious about the underlying mechanism used to dispatch messages. I have a good understanding of how virtual functions in C++ are generally implemented and what the costs are relative to a static or non-virtual method call, but I don't have any background with Obj-C to know how messages are sent. Browsing around I found this loose benchmark and it mentions IMP cached messages being faster than virtual function calls, which are in turn faster than a standard message send. I am not trying to optimize anything, just get deeper understanding of how exactly the messages get dispatched. How are Obj-C messages dispatched? How do Instance Method Pointers get cached and can you (in general) tell by reading the code if a message will get cached? Are class methods essentially the same as a C function (or static class method in C++), or is there something more to them? I know some of these questions may be 'implementation dependent' but there is only one implementation that really counts.

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• how to see my managed objects on the stack?

  - by smwikipedia

  I use SOS.dll in VisualStudio to debug my C# program. The program is as below. The debug command is !DumpStackObjects. class Program { static void Main() { Int32 result = f(1); } static Int32 f(Int32 i) { Int32 j = i + 1; return j; <===========BreakPoint is here } } After I input the "!dso" command in the immediate window of Visual Studio, the result is as below: OS Thread Id: 0xf6c (3948) ESP/REG Object Name Why there's nothing? I thought there should be the args i and local variable j. Thanks for my answering my naive questions...

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• Big smart ViewModels, dumb Views, and any model, the best MVVM approach?

  - by Edward Tanguay

  The following code is a refactoring of my previous MVVM approach (Fat Models, skinny ViewModels and dumb Views, the best MVVM approach?) in which I moved the logic and INotifyPropertyChanged implementation from the model back up into the ViewModel. This makes more sense, since as was pointed out, you often you have to use models that you either can't change or don't want to change and so your MVVM approach should be able to work with any model class as it happens to exist. This example still allows you to view the live data from your model in design mode in Visual Studio and Expression Blend which I think is significant since you could have a mock data store that the designer connects to which has e.g. the smallest and largest strings that the UI can possibly encounter so that he can adjust the design based on those extremes. Questions: I'm a bit surprised that I even have to "put a timer" in my ViewModel since it seems like that is a function of INotifyPropertyChanged, it seems redundant, but it was the only way I could get the XAML UI to constantly (once per second) reflect the state of my model. So it would be interesting to hear anyone who may have taken this approach if you encountered any disadvantages down the road, e.g. with threading or performance. The following code will work if you just copy the XAML and code behind into a new WPF project. XAML: <Window x:Class="TestMvvm73892.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:TestMvvm73892" Title="Window1" Height="300" Width="300"> <Window.Resources> <ObjectDataProvider x:Key="DataSourceCustomer" ObjectType="{x:Type local:CustomerViewModel}" MethodName="GetCustomerViewModel"/> </Window.Resources> <DockPanel DataContext="{StaticResource DataSourceCustomer}"> <StackPanel DockPanel.Dock="Top" Orientation="Horizontal"> <TextBlock Text="{Binding Path=FirstName}"/> <TextBlock Text=" "/> <TextBlock Text="{Binding Path=LastName}"/> </StackPanel> <StackPanel DockPanel.Dock="Top" Orientation="Horizontal"> <TextBlock Text="{Binding Path=TimeOfMostRecentActivity}"/> </StackPanel> </DockPanel> </Window> Code Behind: using System; using System.Windows; using System.ComponentModel; using System.Threading; namespace TestMvvm73892 { public partial class Window1 : Window { public Window1() { InitializeComponent(); } } //view model public class CustomerViewModel : INotifyPropertyChanged { private string _firstName; private string _lastName; private DateTime _timeOfMostRecentActivity; private Timer _timer; public string FirstName { get { return _firstName; } set { _firstName = value; this.RaisePropertyChanged("FirstName"); } } public string LastName { get { return _lastName; } set { _lastName = value; this.RaisePropertyChanged("LastName"); } } public DateTime TimeOfMostRecentActivity { get { return _timeOfMostRecentActivity; } set { _timeOfMostRecentActivity = value; this.RaisePropertyChanged("TimeOfMostRecentActivity"); } } public CustomerViewModel() { _timer = new Timer(CheckForChangesInModel, null, 0, 1000); } private void CheckForChangesInModel(object state) { Customer currentCustomer = CustomerViewModel.GetCurrentCustomer(); MapFieldsFromModeltoViewModel(currentCustomer, this); } public static CustomerViewModel GetCustomerViewModel() { CustomerViewModel customerViewModel = new CustomerViewModel(); Customer currentCustomer = CustomerViewModel.GetCurrentCustomer(); MapFieldsFromModeltoViewModel(currentCustomer, customerViewModel); return customerViewModel; } public static void MapFieldsFromModeltoViewModel(Customer model, CustomerViewModel viewModel) { viewModel.FirstName = model.FirstName; viewModel.LastName = model.LastName; viewModel.TimeOfMostRecentActivity = model.TimeOfMostRecentActivity; } public static Customer GetCurrentCustomer() { return Customer.GetCurrentCustomer(); } //INotifyPropertyChanged implementation public event PropertyChangedEventHandler PropertyChanged; private void RaisePropertyChanged(string property) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(property)); } } } //model public class Customer { public string FirstName { get; set; } public string LastName { get; set; } public DateTime TimeOfMostRecentActivity { get; set; } public static Customer GetCurrentCustomer() { return new Customer { FirstName = "Jim", LastName = "Smith", TimeOfMostRecentActivity = DateTime.Now }; } } }

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