In which namespace is the DelegateCommand in?

I am trying to work out an example from ".NET Domain Driven Design with C#", which contains a code example where you can see declared some attributes of type DelegateCommand.

Now, I've tried googling it up, but I can't find its reference anywhere on MSDN (actually, I found this article, but not DelegateCommand's article itself).

Is the DelegateCommand something that's part of WPF or is it just something created in the boo开发者_Python百科k?

If it's part of WPF (or any other MS product), in which assembly/namespace is it?

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If you use MS Prism,downlaod the lib, add the reference to the project, then you have

using Microsoft.Practices.Prism.Commands; // for DelegateCommand & RaisePropertyChanged

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The DelegateCommand is not (yet) part of the standard library (BCL).

It is part of WPF command-binding for MVVM.

Until we get an 'official' MVVM template in VS, all the MVVM examples/toolkits define it somewhere themselves. Not always with the same name or in the same place.

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DelegateCommands is a custom implementation of ICommand. DelegateCommand was introduced(correct me if I am wrong) in prism(Composite Application framework) - http://compositewpf.codeplex.com/

You can use that or you can implement your own as done here -

https://web.archive.org/web/20101120214610/http://kentb.blogspot.com/2009/04/mvvm-infrastructure-delegatecommand.html

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I've found it called RelayCommand (I think that's the original name, to be honest). Please see here:

MVVM Routed and Relay Command

http://msdn.microsoft.com/en-us/magazine/dd419663.aspx#id0090051

Hope that helps!