Call a function into another using Action C#

Question

I have a function with a parameter and i want to call it as a parameter into another function using Action . this is the code :

    public void msg(string name)
    {
        MessageBox.Show("Hello " + name);
    }

    public void CallMethod(Action<object> Function)
    {

        Function();

    }

it gives me an error when call Method function with msg parameter :

    private void Form1_Load(object sender, EventArgs e)
    {
        CallMethod(msg("John"));
    }

I don't want to send the parameter in Method function like this :

    public void CallMethod(Action<object> Function)
    {

        Function("John");

    }

any help?

When you do CallMethod(msg("Jhon")) you are passing the result of calling msg("Jhon") into the CallMethod method. The result of msg("Jhon") is void - i.e. nothing. So it doesn't make sense. Question...why do you want/need to do this? If we understand the overall purpose of trying to create this CallMethod method, then we might be able to suggest a good way to achieve it. At the moment it doesn't seem to do anything useful, because you could just call the same method directly. — ADyson
– ADyson, Commented Nov 20, 2019 at 9:22
What is the purpose of CallMethod? You need parameter, if you don't want to hardcode "Jhon", but why not calling msg("Jhon") directly? — Sinatr
– Sinatr, Commented Nov 20, 2019 at 9:23
for example, i want to create a function with Try - Catch for all functions and just pass the function name to it. — Borkan
– Borkan, Commented Nov 20, 2019 at 9:24

Sinatr · Accepted Answer · 2019-11-20 09:30:05Z

7

You can create generic method with parameter:

public void CallMethod<T>(Action<T> Function, T parameter)
{
    ...
    Function(parameter);
    ...
}

and use it like this:

CallMethod(msg, "John");

Another possibility is to pass delegate using lambda:

public void CallMethod(Action action)
{
    ...
    action();
    ...
}

the usage:

 CallMethod(() => msg("John"));

edited Nov 20, 2019 at 9:30

answered Nov 20, 2019 at 9:25

Sinatr

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