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• How come you cannot catch Code Contract exceptions?

  - by Finglas

  System.Diagnostics.Contracts.ContractException is not accessiable in my test project. Note this code is purely myself messing around with my shiney new copy of Visual Studio, but I'd like to know what I'm doing wrong. I'm using the professional edition of VS, therefore I do not have static checking. In order to still use code contracts (which I like) I figured the only way my method can work is to catch the exception that is thrown at runtime, but I'm not finding this possible. TestMethod [TestMethod, ExpectedException(typeof(System.Diagnostics.Contracts.ContractException))] public void returning_a_value_less_than_one_throws_exception() { var person = new Person(); person.Number(); } Method public int Number() { Contract.Ensures(Contract.Result<int>() >= 0); return -1; } Error Error 1 'System.Diagnostics.Contracts.ContractException' is inaccessible due to its protection level.

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• IDisposable: is it necessary to check for null on finally {}?

  - by BlackTigerX

  In most examples that you find on the web when explicitly not using "using", the pattern looks something like: SqlConnection c = new SqlConnection(@"..."); try { c.Open(); ... } finally { if (c != null) //<== check for null c.Dispose(); } If you do use "using" and look at the generated IL code, you can see that it generates the check for null L_0024: ldloc.1 L_0025: ldnull L_0026: ceq L_0028: stloc.s CS$4$0000 L_002a: ldloc.s CS$4$0000 L_002c: brtrue.s L_0035 L_002e: ldloc.1 L_002f: callvirt instance void [mscorlib]System.IDisposable::Dispose() L_0034: nop L_0035: endfinally I understand why the IL gets translated to check for null (doesn't know what you did inside the using block), but if you're using try..finally and you have full control of how the IDisposable object gets used inside the try..finally block, do you really need to check for null? if so, why?

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• Implementation question involving implementing an interface

  - by Vivin Paliath

  I'm writing a set of collection classes for different types of Trees. I'm doing this as a learning exercise and I'm also hoping it turns out to be something useful. I really want to do this the right way and so I've been reading Effective Java and I've also been looking at the way Joshua Bloch implemented the collection classes by looking at the source. I seem to have a fair idea of what is being done, but I still have a few things to sort out. I have a Node<T> interface and an AbstractNode<T> class that implements the Node interface. I then created a GenericNode<T> (a node that can have 0 to n children, and that is part of an n-ary tree) class that extends AbstractNode<T> and implements Node<T>. This part was easy. Next, I created a Tree<T> interface and an AbstractTree<T> class that implements the Tree<T> interface. After that, I started writing a GenericTree<T> class that extends AbstractTree<T> and implements Tree<T>. This is where I started having problems. As far as the design is concerned, a GenericTree<T> can only consist of nodes of type GenericTreeNode<T>. This includes the root. In my Tree<T> interface I have: public interface Tree<T> { void setRoot(Node<T> root); Node<T> getRoot(); List<Node<T>> postOrder(); ... rest omitted ... } And, AbstractTree<T> implements this interface: public abstract class AbstractTree<T> implements Tree<T> { protected Node<T> root; protected AbstractTree() { } protected AbstractTree(Node<T> root) { this.root = root; } public void setRoot(Node<T> root) { this.root = root; } public Node<T> getRoot() { return this.root; } ... rest omitted ... } In GenericTree<T>, I can have: public GenericTree(Node<T> root) { super(root); } But what this means is that you can create a generic tree using any subtype of Node<T>. You can also set the root of a tree to any subtype of Node<T>. I want to be able to restrict the type of the node to the type of the tree that it can represent. To fix this, I can do this: public GenericTree(GenericNode<T> root) { super(root); } However, setRoot still accepts a parameter of type Node<T>. Which means a user can still create a tree with the wrong type of root node. How do I enforce this constraint? The only way I can think of doing is either: Do an instanceof which limits the check to runtime. I'm not a huge fan of this. Remove setRoot from the interface and have the base class implement this method. This means that it is not part of the contract and anyone who wants to make a new type of tree needs to remember to implement this method. Is there a better way? The second question I have concerns the return type of postOrder which is List<Node<T>>. This means that if a user is operating on a GenericTree<T> object and calls postOrder, he or she receives a list that consists of Node<T> objects. This means when iterating through (using a foreach construct) they would have perform an explicit cast to GenericNode<T> if they want to use methods that are only defined in that class. I don't like having to place this burden on the user. What are my options in this case? I can only think of removing the method from the interface and have the subclass implement this method making sure that it returns a list of appropriate subtype of Node<T>. However, this once again removes it from the contract and it's anyone who wants to create a new type of tree has to remember to implement this method. Is there a better way?

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• AS3 TextField - unwanted carriage return when setting value to ""

  - by jevinkones

  I have an input TextField and have a KeyboardEvent.KEY_DOWN even listener on the stage to listen for the Keyboard.ENTER event. The event listener adds the entered text to an array or whatever, and then clears the TextField. The problem is that when the Enter key event fires and the TextField value is set to "", it leaves a carriage return in the TextField and the cursor positioned on the second line. WTF? I've been coding AS2 and AS3 for a LONG time and have never ran into this before. Am I losing my mind? Please help, people! :-) Example: var myTextArray:Array = new Array(); stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown); function onKeyDown(e:KeyboardEvent):void{ if(e.keyCode == Keyboard.ENTER){ if(_inputText.text != null){ myTextArray.push(_inputText.text); } _inputText.text = ""; } }

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• Calling Python from Java through scripting engine (jython)?

  - by griffin

  I'm trying to call Jython from a Java 6 application using javax.script: import javax.script.ScriptEngine; import javax.script.ScriptEngineManager; import javax.script.ScriptException; public class jythonEx { public static void main (String args[]) throws ScriptException { ScriptEngineManager mgr = new ScriptEngineManager(); ScriptEngine pyEngine = mgr.getEngineByName("python"); try { pyEngine.eval("print \"Python - Hello, world!\""); } catch (Exception ex) { ex.printStackTrace(); } } } This is causing a NullPointerException: java.lang.NullPointerException at jythonEx.main(jythonEx.java:12) Does anyone have any idea what I'm doing wrong here? Edit: Thanks for the responses! I added jython.jar to the classpath and it runs properly: java -cp "./;jython.jar" jythonEx

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• Bind NameValueCollection to GridView?

  - by Xabatcha

  What kind of collection I should use to convert NameValue collection to be bindable to GridView? When doing directly it didn't work. Code in aspx.cs private void BindList(NameValueCollection nvpList) { resultGV.DataSource = list; resultGV.DataBind(); } Code in aspx <asp:GridView ID="resultGV" runat="server" AutoGenerateColumns="False" Width="100%"> <Columns> <asp:BoundField DataField="Key" HeaderText="Key" /> <asp:BoundField DataField="Value" HeaderText="Value" /> </Columns> </asp:GridView> Any tip most welcome. Thanks. X.

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• UIPickerView not displaying

  - by 4thSpace

  I have a UIPickerView on a UIView. I've implemented its protocol and delegates in the .m file: <UIPickerViewDataSource, UIPickerViewDelegate> In IB, I've connected the above to the picker, which I also have an IBoutlet for. The methods look like this: - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView { return 1; } - (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component { return [self.arr count]; } - (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { return @"test"; } - (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component { //do something } Any ideas which piece I'm missing to get the picker working?

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• WPF, getting two way binding to work on custom control

  - by e28Makaveli

  Two way binding does not work on my custom control with the following internals: public partial class ColorInputControl { public ColorInputControl() { InitializeComponent(); colorPicker.AddHandler(ColorPicker.SelectedColorChangedEvent, new RoutedPropertyChangedEventHandler( SelectedColorChanged));; colorPicker.AddHandler(ColorPicker.CancelEvent, new RoutedPropertyChangedEventHandler(OnCancel)); } public static readonly DependencyProperty SelectedColorProperty = DependencyProperty.Register ("SelectedColor", typeof(Color), typeof(ColorInputControl), new PropertyMetadata(Colors.Transparent, null)); public Color SelectedColor { get { return (Color)GetValue(SelectedColorProperty); //return colorPicker.SelectedColor; } set { SetValue(SelectedColorProperty, value); colorPicker.SelectedColor = value; } } private void SelectedColorChanged(object sender, RoutedPropertyChangedEventArgs<Color> e) { SetValue(SelectedColorProperty, colorPicker.SelectedColor); } } SelectedColor is being bound to a property that fires INotifyPropertyChanged event control when it changes. However, I cannot get two way binding to work. Changes from the UI are pesisted to the data source. However, changes originating from the data source are not reflected on the UI. What did I miss? TIA.

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• Why does the textField not show up when I change the defaultTextFormat

  - by Leon

  I have an if/else statement which checks the length of my current title, and then is suppose to change the defaultTextFormat of the title textField and set the text. Currently the title will not show up now, no matter what character length the title is, any thoughts on what I could be doing wrong here? public function switchTitle(sentText):void { titleString = sentText; trace("---------"+"\n"); trace("Forumula testing"); trace("titleString = "+titleString); trace("titleString.length = "+titleString.length); trace("titleSize/10 = "+(titleSize/10)); trace("\n"); // If Title can fit: if (titleString.length < (titleSize/10)) { vTitle.defaultTextFormat = Fonts.VideoTitle; titleString = sentText; // If Title can't fit: } else if (titleString.length >= (titleSize/10)) { vTitle.defaultTextFormat = Fonts.VideoTitle2; titleString = sentText; } trace("---------"+"\n"); //vTitle.text = titleString; // <-- Original code, worked }

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• Displaying the Time in AM/PM format in android

  - by Rahul Varma

  Hi, I am getting the time using a time picker and displaying the time in the text view using following code... private TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener() { public void onTimeSet(TimePicker view, int hourOfDay, int minute) { Toast.makeText(SendMail.this, "Your Appointment time is "+hourOfDay+":"+minute, Toast.LENGTH_SHORT).show(); TextView datehid = (TextView)findViewById(R.id.timehidden); datehid.setText(String.valueOf(hourOfDay)+ ":"+(String.valueOf(minute))); } }; Now, the issue is when i set the time as 8:00 pm then i get the time displayed as 20:0... I want to display the time as 8:00 pm... How can i do that???

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• Create WPF TextBox that accepts only numbers

  - by Elad

  I would like to create a TextBox that only accepts numeric values, in a specific range. What is the best way to implement such TextBox? I thought about deriving TextBox and to override the validation and coercion of the TextProperty. However, I am not sure how to do this, and I understand that deriving WPF control is generally not recommended. Edit: What I needed was a very basic textbox that filters out all key presses which are not digits. The easiest way to achieve it is to handle the TextBox.PreviewTextInput event: private void textBox_PreviewTextInput(object sender, TextCompositionEventArgs e) { int result; if (!validateStringAsNumber(e.Text,out result,false)) { e.Handled = true; } } (validateStringAsNumber is my function that primarily use Int.TryParse) Some of the suggested solutions are probably better, but for the simple functionality I needed this solution is the easiest and quickest to implement while sufficient for my needs.

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• Create method to handle multiple types of controls

  - by Praesagus

  I am trying to create a method that accepts multiple types of controls - in this case Labels and Panels. The conversion does not work because IConvertible doesn't convert these Types. Any help would be so appreciated. Thanks in advance public void LocationsLink<C>(C control) { if (control != null) { WebControl ctl = (WebControl)Convert.ChangeType(control, typeof(WebControl)); Literal txt = new Literal(); HyperLink lnk = new HyperLink(); txt.Text = "If you prefer a map to the nearest facility please "; lnk.Text = "click here"; lnk.NavigateUrl = "/content/Locations.aspx"; ctl.Controls.Add(txt); ctl.Controls.Add(lnk); } }

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• code to send email

  - by Alexander

  What am I doing wrong here? private void SendMail(string from, string body) { string mailServerName = "plus.pop.mail.yahoo.com"; MailMessage message = new MailMessage(from, "[email protected]", "feedback", body); SmtpClient mailClient = new SmtpClient(); mailClient.Host = mailServerName; mailClient.Send(message); message.Dispose(); } I got the following error: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 209.191.108.191:25

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• BindData to ITemplate for GridView in code behind

  - by tbischel

  How do I programmatically bind data to a custom item template column for a GridView? So far, I've done something similar to this: TemplateField foo = new TemplateField(); foo.ItemTemplate = new bar(); this.GridView1.Columns.Add(foo); where bar is like this: public class bar : ITemplate { public bar() { } public void InstantiateIn(Control container) { DropDownList ddl = new DropDownList(); container.Controls.Add(ddl); } } (the actual dropdownlist is populated) But ITemplate doesn't contain any kind of data binding properties to implement, and the TemplateField class doesn't seem to have any either... What do I do?

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• Show UIAlertView that is same as UIRemoteNotification when app is running in foreground

  - by Sidwyn Koh

  I understand that we can handle push notifications via the method: - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo and we can check if the app was running in the foreground: if (application.applicationState == UIApplicationStateActive ) { ... } How do we show the exact same notification with localisation? NSString *message = [[[userInfo valueForKey:@"aps"] valueForKey:@"alert"] valueForKey:@"loc-key"]; NSString *trueMessage = NSLocalizedString(message, nil); UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Alert" message:trueMessage cancelButtonItem:@"OK" otherButtonItems:@"Show", nil]; [alertView show]; This shows the raw unlocalized text, e.g. "You have a new alert from %1@ on %2@." My question is, how can we place the loc-args inside the UIAlertView as well, when the app is running in the foreground?

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• Memory assignment of local variables

  - by Mask

  void function(int a, int b, int c) { char buffer1[5]; char buffer2[10]; } We must remember that memory can only be addressed in multiples of the word size. A word in our case is 4 bytes, or 32 bits. So our 5 byte buffer is really going to take 8 bytes (2 words) of memory, and our 10 byte buffer is going to take 12 bytes (3 words) of memory. That is why SP is being subtracted by 20. Why it's not ceil((5+10)/4)*4=16?

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• JComponent undock effect

  - by Christo Du Preez

  I'm trying to accomplish an undock effect for a custom Swing JComponent. By default the component is used inside a form along with other components. I want to be able to maximize this component to use the whole screen and then be able to dock it again. So far I've tested public void showDialog() { JFrame mainFrame = App.getApplication().getMainFrame(); JDialog dialog = new JDialog(mainFrame); dialog.setModal(true); dialog.setSize(800, 600); //Set to 80x660 for now dialog.add(this); //This is my JComponent dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE); dialog.setVisible(true); } This gives me desired effect but when closing the dialog my component doesn't receive events no more. How can I prevent this? Or is there perhaps a better way to accomplish this?

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• Frame Redirect in C#

  - by Simon Linder

  I would like to execute a frame redirect in C# from my managed module for the IIS 7. When I call context.Response.Redirect(@"http://www.myRedirect.org");the correct page is shown but also the address is shown in the browser. And that is exactly what I do not want. So I want something like: private void OnBeginRequest(object sender, EventArgs e) { HttpApplication app = (HttpApplication)sender; HttpContext context = app.Context; // make a frame redirect if a specified page is called if (context.Request.ServerVariable["HTTP_REFERER"].Equals(@"http://www.myPage.org/1.html")) { // perform the frame redirect here, but how? // so something like context.Response.Redirect(@"http://www.myRedirect.org"); // but as I said that doesn't redirect as I want it to be } } Any ideas about that?

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• Unmarshalling collections in JaxB

  - by Stas

  Hi, suppose I have this class: public class A { private HashMap<String, B> map; @XmlElement private void setB(ArrayList<B> col) { ... } private ArrayList<B> getB() { ... } } When trying to unmarshall an xml document to this class using JaxB I notice that instead of calling the setB() method and sending me the list of B instances JaxB actually calls the getB() and adds the B instances to the returned list. Why? The reason I want the setter to be called is that the list is actually just a temporary storage from which I want to build the map field, so I thought to do it in the setter. Thanks.

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• Unable to forward UITouch events to my view controller

  - by hyn

  I have a UISplitViewController setup with a custom view added as a subview of the view (UILayoutContainerView) of split view controller. I am trying to forward touch events from my custom view controller to the master and detail views, but the following (which was suggested here on another thread) seems to have no effect: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; // Do something [self.nextResponder touchesBegan:touches withEvent:event]; } (I couldn't get this formatted properly) As a result my custom view controller locks the events and all the UI underneath never has a chance to do anything. How can I get my master and detail view controllers to receive events?

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• Strange thing about .NET 4.0 filesystem enumeration functionality

  - by codymanix

  I just read a page of "Whats new .NET Framework 4.0". I have trouble understanding the last paragraph: To remove open handles on enumerated directories or files Create a custom method (or function in Visual Basic) to contain your enumeration code. Apply the MethodImplAttribute attribute with the NoInlining option to the new method. For example: [MethodImplAttribute(MethodImplOptions.NoInlining)] Private void Enumerate() Include the following method calls, to run after your enumeration code: * The GC.Collect() method (no parameters). * The GC.WaitForPendingFinalizers() method. Why the attribute NoInlining? What harm would inlining do here? Why call the garbage collector manually, why not making the enumerator implement IDisposable in the first place? I suspect they use FindFirstFile()/FindNextFile() API calls for the imlementation, so FindClose() has to be called in any case if the enumeration is done.

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• connect tableView + tableView

  - by totato

  Right now I have an indexed tableview that goes to a detail view but i want it to go to another tableview then a detail view. my code like this: ` - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { displyAnnController *anController = [[displyAnnController alloc] initWithNibName:@"AnnView" bundle:[NSBundle mainBundle]]; DetailViewController *dvController = [[DetailViewController alloc] initWithStyle:UITableViewStyleGrouped]; switch (indexPath.row) { case 0: [self.navigationController pushViewController:anController animated:YES]; [anController release]; anController = nil; break; case 1: [self.navigationController pushViewController:dvController animated:YES]; [dvController release]; dvController = nil; break; default: break; }` and when I press the cell with index 0 in the simulator, the program is crash! what's the problem? pleas help me ..

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• change fillColor of selected CAShapeLayer

  - by Frank

  I'm trying to change the fillColor of a CAShapeLayer when the layer it's contained in is touched. I'm able to change the background color of the tapped layer like this: -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { CALayer *layer = [(CALayer *)self.view.layer.presentationLayer hitTest:point]; layer = layer.modelLayer; layer.backgroundColor = [UIColor blueColor].CGColor; } This turns the background of "layer" blue as expected. My problem is how do I change the color of the CAShapelayer inside "layer"? Thanks!

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• How to write a virtual conditional breakpoint in java

  - by Phuong Nguyen de ManCity fan

  I'm sorry if the question title may mis-inform you, but I cannot find a proper word to explain that. If you ever working with .NET, you would know that there is Assert class that will automatically wake up and attach debugger if necessary and then have debugger (Visual Studio) pausing at the Assert command, given the Assert command failed. Given I'm running a java program and having debugger connected, then how can I have debugger to break on certain condition without manually setup a break point? I'm expecting something like that: void doSomeThing(String x){ if (x==null) breakDebuggerNow(); }

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• Objectiveflickr set properties, more than one call

  - by user295944

  I cant to set Meta and set Location in ObjectiveFlickr if I do only one it works fine, but if I do both it only does the first one - (void)flickrAPIRequest:(OFFlickrAPIRequest *)inRequest didCompleteWithResponse:(NSDictionary *)inResponseDictionary { NSLog(@"%s %@ %@", PRETTY_FUNCTION, inRequest.sessionInfo, inResponseDictionary); if (inRequest.sessionInfo == kUploadImageStep) { snapPictureDescriptionLabel.text = @"Setting properties..."; NSLog(@"%@", inResponseDictionary); NSString *photoID = [[inResponseDictionary valueForKeyPath:@"photoid"] textContent]; flickrRequest.sessionInfo = kSetImagePropertiesStep; [flickrRequest callAPIMethodWithPOST:@"flickr.photos.setMeta" arguments:[NSDictionary dictionaryWithObjectsAndKeys:photoID, @"photo_id", @"Snap and Run", @"title", @"Uploaded from my iPhone/iPod Touch", @"description", nil]]; flickrRequest.sessionInfo = kSetImagePropertiesStep; [flickrRequest callAPIMethodWithPOST:@"flickr.photos.geo.setLocation" arguments:[NSDictionary dictionaryWithObjectsAndKeys:photoID, @"photo_id",@"34" ,@"lat",@"-118",@"lon", nil]]; } else if (inRequest.sessionInfo == kSetImagePropertiesStep) { [self updateUserInterface:nil]; snapPictureDescriptionLabel.text = @"Done"; [UIApplication sharedApplication].idleTimerDisabled = NO; } }

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