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C# Event Handling

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C# Event Handling
webwired
1 Oct, 2008 - 05:54 AM
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One of the things that I'm having difficulty understanding, trying to learn C# is Event Handling in comparison to VB .NET... I get VB .NET's way

For example, here in this event I can simply change the .CellClick event to any number of events that I want to use, .DoubleClick, etc.
CODE
Private Sub CustomersDataGridView_CellSingleClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles CustomersDataGridView.CellClick


But, how do I do it in C# when it doesn't define the particular event?
CODE
private void CustomersDataGridView_CellContentClick(object sender, DataGridViewCellEventArgs e)


Please help, this has been one of my major problems trying to pick up on C#... I wrote a program in VB .NET and figured I would try to duplicate it in C# to help me learn.
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modi123_1
RE: C# Event Handling
1 Oct, 2008 - 06:04 AM
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QUOTE(webwired @ 1 Oct, 2008 - 08:54 AM) *

One of the things that I'm having difficulty understanding, trying to learn C# is Event Handling in comparison to VB .NET... I get VB .NET's way

For example, here in this event I can simply change the .CellClick event to any number of events that I want to use, .DoubleClick, etc.
CODE
Private Sub CustomersDataGridView_CellSingleClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles CustomersDataGridView.CellClick


But, how do I do it in C# when it doesn't define the particular event?
CODE
private void CustomersDataGridView_CellContentClick(object sender, DataGridViewCellEventArgs e)


Please help, this has been one of my major problems trying to pick up on C#... I wrote a program in VB .NET and figured I would try to duplicate it in C# to help me learn.



It's all about event handlers! VB.net does event handlers, but they also have the nice short hand where you put the "handles <event name>" after the subroutine.

Check this out:
http://www.csharphelp.com/archives/archive253.html
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webwired
RE: C# Event Handling
1 Oct, 2008 - 06:17 AM
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QUOTE(modi123_1 @ 1 Oct, 2008 - 07:04 AM) *

It's all about event handlers! VB.net does event handlers, but they also have the nice short hand where you put the "handles <event name>" after the subroutine.

Check this out:
http://www.csharphelp.com/archives/archive253.html


Thank you for your reply, but from what I can tell, that is all using one particular Event Handler, what I'd like to know is how to change a particular Event for a control... Like you said, VB .NET you just put ""handles <event name>" after the subroutine."
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JackOfAllTrades
RE: C# Event Handling
1 Oct, 2008 - 07:06 AM
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I think you want something like this to tie the CellClick event of the CustomersDataGridView component to the event handler you've created:
csharp
CustomersDataGridView.CellClick += new EventHandler(this.CustomersDataGridView_CellContentClick);


This post has been edited by JackOfAllTrades: 1 Oct, 2008 - 07:07 AM
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webwired
RE: C# Event Handling
1 Oct, 2008 - 07:33 AM
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Oh, I think I see... You can define a different Event Handler by adding that step to the end of the sub, ie.
CODE
CustomersDataGridView.ANY_EVENT += new EventHandler(this.CustomersDataGridView_CellContentClick);


Whereas in VB .NET you just put it at the end sub...
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eclipsed4utoo
RE: C# Event Handling
1 Oct, 2008 - 07:42 AM
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QUOTE(webwired @ 1 Oct, 2008 - 11:33 AM) *

Oh, I think I see... You can define a different Event Handler by adding that step to the end of the sub, ie.
CODE
CustomersDataGridView.ANY_EVENT += new EventHandler(this.CustomersDataGridView_CellContentClick);


Whereas in VB .NET you just put it at the end sub...


you would put that in the form load
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modi123_1
RE: C# Event Handling
1 Oct, 2008 - 07:43 AM
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Yes... essentially when your form starts up - in your constructor you would tied all your controls' events to a specific function.

Now say you create a new c# windows form with a button on it. If you are in the designer and double click that button the windows generated code that ties the control's event to the windows generated sub routine "button1_Click" is in the designer file. You can easily just pull that out of the designer and put that into main constructor.
cpp

    public partial class Form1 : Form
    {
        // form's main
        public Form1()
        {
            //init
            InitializeComponent();
            //where i tie the button's click event to the subroutine I want the event to fire.
            this.button1.Click += new System.EventHandler(this.button1_Click);
        }

        //sub routine that I want to access when the button is clicked
        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("yo");
        }
    }


This post has been edited by modi123_1: 1 Oct, 2008 - 07:46 AM
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webwired
RE: C# Event Handling
1 Oct, 2008 - 08:56 AM
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Excellent, good stuff... I think I got it...
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webwired
RE: C# Event Handling
2 Oct, 2008 - 08:54 AM
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Well guys, I tried it out and I can't seem to make it work... here's my code...

CODE

    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
            customersDataGridView.CellContentDoubleClick += new EventHandler(customersDataGridView_CellContentClick);
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            customersDataGridView.DataSource = DataAccess.GetAllCustomers();
        }

        private void customersDataGridView_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            MessageBox.Show("It worked!");
        }
    }


I get this error... I did some more researching on it, and from what I can tell, it should be working... any ideas?

QUOTE
No overload for 'customersDataGridView_CellContentClick' matches delegate 'System.EventHandler'
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girasquid
RE: C# Event Handling
2 Oct, 2008 - 08:58 AM
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Try changing your DataGridViewCellEventArgs to EventArgs, and seeing if that solves the problem - if it does, then you it's not a DataGridViewCellEventArgs variable you should be expecting.
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webwired
RE: C# Event Handling
2 Oct, 2008 - 09:03 AM
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QUOTE(girasquid @ 2 Oct, 2008 - 09:58 AM) *

Try changing your DataGridViewCellEventArgs to EventArgs, and seeing if that solves the problem - if it does, then you it's not a DataGridViewCellEventArgs variable you should be expecting.


Just tried it, came up with error, "Cannot implicitly convert type 'System.EventHandler' to 'System.Windows.Forms.DataGridViewCellEventHandler'"
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gabehabe
RE: C# Event Handling
2 Oct, 2008 - 09:57 AM
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Your answer is right there.

Try this:
dataGridView1.<event> += new DataGridViewCellEventHandler(dataGridView1_CellClick);
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