Parameter Count Mismatch

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<pre lang="cs">public delegate void buttonclick(object sender, EventArgs e);
        private void button1_Click(object sender, EventArgs e)
        {

            if (button1.InvokeRequired)
                button1.Invoke(new buttonclick(button1_Click));

            if (button1.BackColor == Color.LightGreen)
            {
                move_button(condition.Text.Split(new char[] { &#39; &#39; })[0].ToString(), hold_button, button1);
            }
            else
            {
                Place_Point(button1);
            }
        }</pre>

private void sampleclick()
{
 button1_Click(this,new EventArgs());
}

When i call button_click method from sampleclick it shows an exception "Parameter Count Mismatch" what is the meaning of it and how can i overcome this exception....

Posted 10-Sep-13 2:07am

sagar.panuganti

Updated 10-Sep-13 2:08am

v2

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[no name] 10-Sep-13 8:36am

It means exactly what is says. You are trying to invoke a method with the wrong number of parameters.

Sergey Alexandrovich Kryukov 10-Sep-13 11:58am

First of all, do you call it from both UI and some other thread?
—SA

2 solutions

Solution 1

You have to check the count of the parameters in your functions what you call in your code.
I think the problem caused by your move_button or Place_Point functions.

Posted 10-Sep-13 2:37am

norbitrial

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V.Lorz · Accepted Answer · 2013-09-10T03:15:00

Solution 2

The buttonclick method takes two parameters wich you're not supplying in your call.

C#

if (button1.InvokeRequired)
      button1.Invoke(new buttonclick(button1_Click) ??????? );

Rewrite it like this:

C#

if (button1.InvokeRequired) 
      button1.Invoke(new buttonclick(button1_Click), sender, e);

Posted 10-Sep-13 3:15am

V.Lorz

Comments

Sergey Alexandrovich Kryukov 10-Sep-13 12:03pm

That is correct and should fix the immediate, but I suspect the whole idea is bad. If something is called from a non-UI thread, some semantic code should normally be called, not the method uses as an event handler for an UI event. Actually, from my CodeProject experience, using "InvokeRequired" is indicative: people using it often don't understand how to use Invoke. More usually, in a better designed code, the method having Invoke is always called from a non-UI thread.

A little problem with your resolution is: what should be put in "sender" and "e"? Those a bogus parameters, even though they are technically required. Event handler should not be invoked, that's the key.

(I voted 4.)

V.Lorz 10-Sep-13 14:16pm

I agree with you. It makes a lot of sense and the code should be, in fact, redesigned in the manner your describe. Thanks for the vote and your comments.

Sergey Alexandrovich Kryukov 10-Sep-13 14:33pm

Great. And you are very welcome.
—SA