Pass different commandparameters to same command using RelayCommand WPF

问题

So, what I am trying to achieve here is to use the same command to execute some different kind of code. The way I want to distinguish between the code I want to be executed can be done using commandparameters. I just don't see how I can do it the way I want to, when I have to use the RelayCommand.

This means, that I have 2 different buttons, that both uses the same command, just with different commandparameters.

This is my XAML so far:

<RibbonButton SmallImageSource="../Images/whatever.png" Label="Attribute" Command="{Binding AddItemToNodeCommand}" CommandParameter="Attribute"/>

<RibbonButton SmallImageSource="../Images/whatever.png" Label="Method" Command="{Binding AddItemToNodeCommand}" CommandParameter="Method" />

This is what I have in my ViewModel:

public ICommand AddItemToNodeCommand { get; private set; }

and of course:

AddItemToNodeCommand = new RelayCommand(AddItemToNode);

Is there some way that I can be able to use that commandparameter when calling the relayCommand?

If you need any more information, or code please just ask.

回答1:

You can use a lambda expression to give you access to the CommandParameter... try this:

AddItemToNodeCommand = new RelayCommand(parameter => AddItemToNode(parameter));

Please note that (as with all lambda expressions) the name parameter here could be anything... this would work just the same:

AddItemToNodeCommand = new RelayCommand(p => AddItemToNode(p));

This is because we are simply setting the input parameter name for it before the =>.

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UPDATE >>>

Have you tried it like this?:

AddItemToNodeCommand = new RelayCommand<object>(parameter => AddItemToNode(parameter));

The last option is just to call it in the same way as you started with:

AddItemToNodeCommand = new RelayCommand(AddItemToNode);

来源：https://stackoverflow.com/questions/19573380/pass-different-commandparameters-to-same-command-using-relaycommand-wpf