In WPF, how to pass a parameter to ICommand.CanExecute()

Question

public bool SelectAll { get { return this.Get<bool>("SelectAll"); } set { this.Set<bool>("SelectAll", value); if (this.SelectAllCommand.CanExecute(null)) this.SelectAllCommand.Execute(value); } }

As my code, I want to a checkbox - select all function. When I manually click the "select all", I want to execute the SelectAllCommand, but if the checkbox is selected automtically, the CanExecute should return false to me....

I don't how to pass a parameter to CanExecute... How can I perfectly do that ...?

Thanks in advance

Why not bind to CheckBox.Command and CheckBox.CommandParameter? — user7116
– user7116, Commented Mar 13, 2013 at 2:46

Tim · Accepted Answer · 2013-03-13 02:45:01Z

1

Well, in your code, you're currently passing a parameter, that parameter just happens to be null. So don't you more accurately want to do

if (this.SelectAllCommand.CanExecute(value))

?

answered Mar 13, 2013 at 2:45

Tim

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2 Comments

Miyazaki Over a year ago

yes, I know, but I have to declare a variable, e.g. bool isAuto to control ? and then pass the variable to CanExecute() ? is that a good code style ... ? thanks :)

Tim Over a year ago

Sorry, I'm not sure what you mean. Perhaps some more explanation would be helpful.

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