Passing an Action with Different Parameters

Question

I have a class in C# named Button and I want the Button have a functionality that can be passed through its constructor and whenever the Button was pressed the Action executes.

Button(Rect rect, string text, Action Func);

I have used Action and It worked perfectly until I found out that I can't pass a void Action with arguments.

For example:

void DoSomething(string str);

How can I be able to pass any void Action with any arguments?

Answer 1

The button doesn't have to care about the argument, but it still needs to be passed a delegate with no arguments and returning void. This is easily done:

new Button(rect, text, () => YourMethod(whateverArgument))

Depending on what you're trying to do, whateverArgument can be a local, a constant or a field. Just think about when it's supposed to read the value to pass to the inner method.

Answer 2

确保可以传递参数，只需使用以下命令：

Button b = new Button(.., .., () => DoSomething("YourString");

Answer 3

I advice you to use simplefied command pattern : Create base class or interface Command

interface ICommand
{
    void Execute();
}

//Create secific command and pass parameters in constructor:
class Command : ICommand
{
    public Command(string str)
    {
        //do smth
    }
    void Execute()
    {
        //do smth
    }
}

Button(Rect rect, string text, ICommand cmd)
{
    cmd.Execute();
}