CODEWITHSUNDEEP
c#
Clem
Clem

Reputation: 11824

How to pass function as parameter

Ok, I already passing function as parameter to another function like this:

someFunction(..., passFunc);
passFunc(){ MessageBox.Show("Message"); }
private void someFunction(..., Func<int> f) { f(); }

This works just fine. I pass "passFunc" to "someFunction" as parameter and then call this parameter("f()"). Then I got messagebox with text "message". Ok.

In later version of program, function "passFunc" is called when I click on specific button's... Then I wish to get text. I normally do this so: ((Button)sender).Text;. But in this case I cant do this, because I have no parameters in this "passFunc".

How can I do this? So, that "passFunc" will look like: passFunc(object sender, EventArgs e)

Then I'll be able to do this:

passFunc(object sender, EventArgs e)
{
    MessageBox.Show(((Button)sender).Text);
}

here is code: http://pastie.org/6079188

Upvotes: 1

Views: 196

Answers (2)

Marius
Marius

Reputation: 1072

If you want to pass input to a func use this generic type overload:

Func<string, int> passFunc

EDIT:

You call passFunc like this

passFunc("some input");

EDIT2:

passFunc(object sender, EventArgs e) cannot be used with a Func because it probably has a void return type. You then have to use Action<object, EventArgs>.

Upvotes: 1

Twiltie
Twiltie

Reputation: 572

Why don't you subscribe passFunc to the event handler for that button? It would look something like this button1.Click += new EventHandler(passFunc) and then passFunc would be

void passFunc(object sender, EventArgs e)
{
     MessageBox.Show((sender as Button).Text); 
}

I don't know if this is exactly what you want to achieve but it might work.

Upvotes: 0

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