CODEWITHSUNDEEP
wpfmvvmrelaycommand
StalkeR
StalkeR

Reputation: 13

How can I invoke relay command with parameter programmatically wpf mvvm?

I know how to invoke relay command without parameter using mvvm pattern, but how to do the same with command with parameter?

Upvotes: -1

Views: 1631

Answers (2)

Mark Diedericks
Mark Diedericks

Reputation: 321

If I understand you correctly, your command requires you to pass the TextEditor object in as a parameter, and you'd like to know how to do this in XAML. Since your TextEditor is named XMLView you'd simply bind this to the command parameter;

<KeyBinding Command="{Binding ValidateXMLCommand}" CommandParameter="{Binding ElementName=XMLView}" Modifiers="Control" Key="V" />

Notice the addition of CommandParameter="{Binding ElementName=XMLView}", this will pass the AvalonEdit TextEditor control instance as a parameter of the command.

Read more; https://stackoverflow.com/a/32064646/8520655

If you instead mean to invoke the RelayCommand from a ViewModel (in normal C#), you'd do the following;

if (ValidateXMLCommand.CanExecute(XMLView))
                ValidateXMLCommand.Execute(XMLView);

Upvotes: 0

Peregrine
Peregrine

Reputation: 4556

The control (e.g. Button / MenuItem) that you're binding your relaycommand to will have a CommandParameter property in addition to the Command property.

See here for an example of usage.

To execute a command from code behind, just call its Invoke() method, with the required parameter.

Upvotes: 0

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