I'm trying to parameterize a RelayCommand but am getting a runtime cast exception.
Here are the relevant xaml and view model lines:
XAML
<MenuItem Header="Save Project As" Command="{Binding Main.SaveProjectAsRelayCommand}" CommandParameter="false" />
ViewModel
public RelayCommand<bool> SaveProjectAsRelayCommand { get; set; }
SaveProjectAsRelayCommand = new RelayCommand<bool>(SaveProjectAs, ProjectTaskCanExecute);
private void SaveProjectAs(bool b){...}
private bool ProjectTaskCanExecute(bool b){...}
When I click the File Menu, GalaSoft throws an
InvalidCastException ("Specified cast is not valid)
When I remove the parameter from everything, works fine.
Do I have to do something to enable "false" to be cast to a bool?
The Type Converter must be converting it to a string instead of a bool.
<MenuItem Header="Save Project As" Command="{Binding Main.SaveProjectAsRelayCommand}" >
<MenuItem.CommandParameter>
<x:Boolean>False<x:Boolean>
</MenuItem.CommandParameter>
</MenuItem>
Try the above. You will have to use the following name space in the XAML.
xmlns:x="clr-namespace:System;assembly=mscorlib"
Alternatively, you could create a property in your 'main' that you bind to
<MenuItem Header="Save Project As" Command="{Binding Main.SaveProjectAsRelayCommand}" CommandParameter="{Binding Main.IsTask}" />
In the main VM you will than have
public bool IsTask{get;set;}
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