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OnClick Variables
Posted on 2011-03-08
Hello, I am using C# to create an ASP.NET website. Here's my issue:
I have a standard button on one page. This button has an onclick setup to fire a method. I have a second button on this page. When the user clicks on this button, its onclick setup fires another method which does some stuff, BUT at the end of this method, I would like it to fire the first button's onclick method.
Currently when I add the name of the first button's onclick method ( button1_Click() ) to the end of the second button's onclick method, this error is displayed: "No overload method for..takes 0 arguments".
I know what this error means: the system wants me to include two variables when calling button1_click, which are the default: object sender, EventArgs e
What are object sender, EventArgs e and how do I include them in my call to button1_Click from the button2_click method?
Thank you in advance.
I have a standard button on one page. This button has an onclick setup to fire a method. I have a second button on this page. When the user clicks on this button, its onclick setup fires another method which does some stuff, BUT at the end of this method, I would like it to fire the first button's onclick method.
Currently when I add the name of the first button's onclick method ( button1_Click() ) to the end of the second button's onclick method, this error is displayed: "No overload method for..takes 0 arguments".
I know what this error means: the system wants me to include two variables when calling button1_click, which are the default: object sender, EventArgs e
What are object sender, EventArgs e and how do I include them in my call to button1_Click from the button2_click method?
Thank you in advance.
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4 Comments
"Sender" refers to the control that raised the event. "EventArgs" will is an object that contains data about the event, in the case of a button click event eventargs doesn't tell you anything useful. If you want to manually call the method associated with the click event you can safely pass null for both arguments:
button1_Click(null, null);
carl_tawn is absolutely correct, I would only expand on his response slightly to say that it is usually safe to pass null for both arguments - it certainly seems to be the case you could safely do so given your current example, just wanted to point out it's not always safe (99% safe, 1% not safe).
Also, I would suggest moving the code that actually does "stuff" into it's own method(s), and then calling those methods from the button event handlers:
Also, I would suggest moving the code that actually does "stuff" into it's own method(s), and then calling those methods from the button event handlers:
private void Button1_Click(object sender, EventArgs e)
{
// Button 1 just does stuff.
DoStuff();
}
private void Button2_Click(object sender, EventArgs e)
{
// Button 2 does stuff, and also does other stuff
DoStuff();
DoOtherStuff();
}
private void DoStuff()
{
// Do some stuff
}
private void DoOtherStuff()
{
// Do some other stuff
}
@tgerbert - You are of course correct - just figured it wasn't likely to be an issue in this scenario so skimmed over it :)
Just to expand a little. It is possible to use a single event handler as the target for an event on multiple controls. In a scenario like that you may want to cast "sender" in order to find out which control raised the event and act accordingly.
Just to expand a little. It is possible to use a single event handler as the target for an event on multiple controls. In a scenario like that you may want to cast "sender" in order to find out which control raised the event and act accordingly.
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