Prevent double-click from double firing a command

Question

Given that you have a control that fires a command:

Is there a way to prevent the command from being fired

Answer 1

I'm using Xamarin and MVVMCross, although is not WPF I think the following solution applies, I created a solution which is viewmodel specific (doesn't deal with platform specific UI) which I think is very handy, using a helper or base class for the viewmodel create a List that keeps track of the commands, something like this:

private readonly List Commands = new List();

        public bool IsCommandRunning(string command)
        {
            return Commands.Any(c => c == command);
        }

        public void StartCommand(string command)
        {
            if (!Commands.Any(c => c == command)) Commands.Add(command);
        }

        public void FinishCommand(string command)
        {
            if (Commands.Any(c => c == command))  Commands.Remove(command);
        }

        public void RemoveAllCommands()
        {
            Commands.Clear();
        }

Add the command in the action like this:

public IMvxCommand MyCommand
        {
            get
            {
                return new MvxCommand(async() =>
                {
                    var command = nameof(MyCommand);
                    if (IsCommandRunning(command)) return;

                    try
                    {
                        StartCommand(command);

                        await Task.Delay(3000);
                       //click the button several times while delay
                    }
                    finally
                    {
                        FinishCommand(command);
                    }
                });
            }
        }

The try/finally just ensures the command is always finished.

Tested it by setting the action async and doing a delay, first tap works second one returns in the condition.