private static CommandWrapper GetCommandWrapperInstance(IDictionary <ICommand, CommandWrapper> commandWrappers, ICommand command)
{
lock (commandWrappers)
{
if (commandWrappers.ContainsKey(command))
{
return(commandWrappers[command]);
}
else
{
CommandWrapper Wrapper = new CommandWrapper(command);
commandWrappers.Add(command, Wrapper);
return(Wrapper);
}
}
}
/// <summary>
/// Converts a value.
/// </summary>
/// <returns>
/// A converted value. If the method returns null, the valid null value is used.
/// </returns>
/// <param name="value">The value produced by the binding source.</param><param name="targetType">The type of the binding target property.</param><param name="parameter">The converter parameter to use.</param><param name="culture">The culture to use in the converter.</param>
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
object Command = value;
if (Command == null)
{
return(null);
}
else if (Command is ICommand)
{
return(CommandWrapper.GetCommandWrapperInstance((ICommand)Command));
}
else
{
throw new InvalidOperationException("Collection to wrap is either not enumerable or does not support INotifyCollectionChanged");
}
}