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Questions tagged [delegatecommand]

WPF design pattern that provides a generic reusable implementation of ICommand. Versions of this object can be found in the versions of Microsoft Prism.

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How can I simplify the implementation of Commands in ViewModels for WPF/MVVM?

I have noticed that I am repeating a lot of code when implementing Commands on ViewModels for a MVVM-WPF scenario. The standard implementation, as shown below, consists of a public readonly field of type ICommand, a private DelegateCommand field and…
sammarcow
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ContextMenu command binding

I have inherited a WPF application developed against an older version of Prism (Composite Application Guidance 1.0). The general pattern in this app is to use Microsoft.Practices.Composite.Wpf.DelegateCommand in the ViewModel and avoids code-behind…
grinder22
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How can I make Prism's DelegateCommand observe a child view-model's property?

My "parent" view-model (AnalyzeVm) has a child view-model (ScanVm) that represents something that can be saved to disk. I want to give the parent a command (SaveCmd) that is enabled only when the ScanVm.IsDirty property is true. I already use…
Joe
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How to unit test CanExecuteChanged and RaisePropertyChanged

I am trying to practice strict TDD and have run into issue related to DelegateCommands and testing that CanExecute has been called. These are my two test titles: "When I select an item from the list I should be able to add child items" "When no…
Damian
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CommandParameter of event trigger using InvokeDelegateCommandAction

I am using the class InvokeDelegateCommandAction from AlexeyZakharov's weblog on the basis of some advice from guys that this is the best way to send back a parameter from a View to a ViewModel from an EventTrigger. Here's what I have. In the View…
tigerswithguitars
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AutoProperties doesn't work with DelegateCommand.ObservesCanExecute in prism?

There is something under the hood that I don't understand with ObservesCanExecute on DelegateCommand in prism. It has something to see with AutoProperties ... I think I have a View with a button which is bound to a DelegateCommand in my…
Belight
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Async CanExecute method using DelegateCommand in MVVM

I have a simple DelegateCommand class that looks like this: public class DelegateCommand : System.Windows.Input.ICommand where T : class { public event EventHandler CanExecuteChanged; private readonly Predicate _canExecute; …
Maxim Gershkovich
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Using .delegate in jQuery

I've got a function that works great on creating the custom tooltips I need for an event calendar. The problem is that when a user clicks to go to the next month on the calendar, a new set of links is made and jQuery is no longer selecting those…
Jarrod
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DelegateCommand in separate class first call of CanExecute parameter is null

I have the following problem. I have moved the DelegateCommand from the ViewModel to a separate class. And observe a property in the ViewModel. That works so far. Then CanExecute will call the first one with NULL when the view is initialized. Which…
ascholz
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Prism DelgateComand throws an exception

I have a static delegate command. I'm passing a bool to the constructor. However, it is throwing a runtime exception. public static class myViewModel { public static ICommand myCommand {get; private set;} static myViewModel { …
John
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WPF and MVVM problem

if try implemnt my first MVVM in WPF app. I have old app based on winforms and I want use my logic (class) from this project. I have Model, it consist with these classes: public class FriendData { //... } public class PingData { //... } public…
user481758
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Prism: have to call RaiseCanExecuteChanged() explicitly

Below is a very simple Prism.Wpf example with a DelegateCommand that has both Execute and CanExecute delegates. Suppose that CanExecute depends on some property. It seems that Prism's DelegateCommand doesn't re-evaluate CanExecute condition…
mechanic
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Delegate command not executing on property change

I am currently trying to make a slider in ViewA change the font size of text in viewA and viewB. I have everything bound correctly, but the delegate command is not calling the execute method when the font size property is changed. If I manually call…
Methalous
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How to make the CanExecute trigger properly using Prism 6

I have a Model public class Irritant : BindableBase { private short _id; private string _name; private string _description; public short Id { get { return _id; } set { SetProperty(ref _id, value); } } …
Pamingkas Sevada
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RaiseCanExecuteChanged not Working In Compiled exe But Does Work when Debugging

I have absolutely no idea what's causing this. Background: Using the Prism Framework I have a button bound to a DelegateCommand I call RaiseCanExecuteChanged When I start the app in debugging mode in Visual Studio, everything works perfectly.…
Bryant
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