KeyPress event with controls in Windows

batel hodefi

I created a Form and put some controls in it like: button, textBox. I tried to connect all the controls to KeyPressEvent, but when it's run the count of the collection is 0. I don't understand why? my code: public Form1() { InitializeComponent(); ControlCollection C = new ControlCollection(this); for (int i = 0; i < C.Count; i++) { C[i].KeyPress += new KeyPressEventHandler(funcionName); } }

15 Replies

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Kirtan Patel17y ago
Accepted answer
Friend,

Here is Code that you need .

if my answer helps you then check "do you like this answer" check box :)

you dont have to loop through all controls for that .

private void Form1_Load(object sender, EventArgs e)

        {

            this.KeyPreview = true;

        }

        private void Form1_KeyDown(object sender, KeyEventArgs e)

        {

            if (e.KeyCode == Keys.A || e.KeyCode == Keys.Tab)

            {

                SendKeys.Send("{TAB}");

            }

        }

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batel hodefi17y ago
But aoutomatically when I drag a control to the form it has the right TabIndex.
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Kirtan Patel17y ago
Friend ,
you need to set tab order to move to next control . then my code will move focus to next control automatically

Just Set TabIndex properties of every control in form as starting from 0 to ...n

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theLizard17y ago
There is a lot more to what you are trying to do than you think, accepting an answer to your question when you don't know what the answer should be makes you write code that leads you no where, what you want to do is a very complex task.

You need to know which control you came from and which control you need to go to in the order you want to go in, I have written a control (lizardControlAgent) that does this for you but for this control to work I also created controls inherited from standard controls with additional properties to handle these types of situations.

this is the code I write when I need to shift focus to the next control in specified order.

private void KeyDowNHandlerForAllControls(object sender, KeyPressEventArgs e)
{
//an example only.
if(e.KeyCode == Keys.A && lizardControlAgent.MoveNextAllowed(object sender, KeyPressEventArgs e)
     {
lizardControlAgent.FocusNext();
     }
}

Don't be so quick to accept answers...
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batel hodefi17y ago
thank you! your code helped me a lot. but, when I have Button control and I press A, it's not advance to the next control. Do you have a solution for this?
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Kirtan Patel17y ago
Friend ,

No Code is Needed to Advance the control as When you Press A it will take A as Tab Button Of KeyBorad and Cursor will move to Next Control in Form
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batel hodefi17y ago
Can you explain? where you advance to the next control?
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batel hodefi17y ago
thank you, but I didn't succeed open it..
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batel hodefi17y ago
I try to pass over the controls by a specific key. I mean, I want that when I press 'a' or enter or another key the next control will be active..like we have with the Tab key..
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Kirtan Patel17y ago
Friend,

Can you tell me What you exactly trying to do by this code i will provide code for yout question .

just tell me the task you want to perform :)
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batel hodefi17y ago
I tried something like that: private void LoadMainForm(object sender, EventArgs e) { ControlCollection C = new ControlCollection(this); for (int i = 0; i < C.Count; i++) { C[i].KeyPress += new KeyPressEventHandler(PassControls); } } private void PassControls(object sender, KeyPressEventArgs e) { if (e.KeyChar== 'a') { Control C = sender as Control; this.GetNextControl(C, true); } } but it's still don't work for me..- Althought I entered controls C.count=0.. I try to pass between the controls when I press the key 'a'..
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Hiren Soni17y ago
In above post i send u a code as per your question....dont 4get to check do you like this
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Hiren Soni17y ago
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Hiren Soni17y ago
To count controls you can use this.controls.count method
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theLizard17y ago
Try doing that what you have done in the Form_load event or try the following

1. go to the events on the properties pane
2. give the keypress event a a name like groupNameKeyPress, it will then generate    private void groupNameKeyPress(object sender, KeyPressEventArgs e)

then for each control that has a keypress event link it to the groupNameKeyPress by selecting it from the drop down list of the key press event.

You can then do things like this.

        private void groupNameKeyPress(object sender, KeyPressEventArgs e)
           {

           if(sender.GetType().Name == "TextBox")
               {
               TextBox t = (TextBox)sender; //cast sender to a text box assigning it to t, then access it's properties, methods and events.
               t.Text = "Hello";
               }
           }
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