Question

I try to understand the ICommand from wpf.

In my Event class I implement the ICommand and their methods.

one method is the Execute:

public void Execute(object parameter)
{
    //Do something
}

now is my question: what value contains the parameter parameter from Execute?

Answer 1

That value depends on the value you pass to the command.

like a sniplet:

Command="{Binding CalculateCommand}" CommandParameter="LCM"/>

Look here: Command Binding with Parameter Passing for more details.