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C# Determine when F3 key is pressed

Posted on 2007-04-11
12
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Last Modified: 2008-02-01
Hi guys 'n gals,

I need to determine when a user presses the F3 key, how would I do that? Would I need to add it to the Form KeyPress event?


Cheers!
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Question by:Cyber-Drugs
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12 Comments
 
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Accepted Solution

by:
Babycorn-Starfish earned 300 total points
ID: 18893369
hi,

try this in the KeyDown event

if (e.KeyCode == Keys.F3)
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Author Comment

by:Cyber-Drugs
ID: 18893415
Hi,

Just tried this:

        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.F3)
            {
                MessageBox.Show("F3 pressed");
            }
        }


and it doesn't work...
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Expert Comment

by:Babycorn-Starfish
ID: 18893456
hmmm...

is your form focussed when you press the key?
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Author Comment

by:Cyber-Drugs
ID: 18893546
Is it, I even clicked onto the Form multiple times to make sure.
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Expert Comment

by:Babycorn-Starfish
ID: 18893620
thats odd.

recreatred my project just to make sure i didn't do anything i hadn't mentioned but i just add the event handler via the properties tab on for the form and put in the code above.

Is the event hooked up? Look in the Form.Designer.cs file in the solution explorer, mine is as follows

/// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.SuspendLayout();
            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Name = "Form1";
            this.Text = "Form1";
            this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyDown); //<-----this line here
            this.ResumeLayout(false);
        }

if you have this, set a break point in the event handler and see whether you actually enter that method at all.

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Author Comment

by:Cyber-Drugs
ID: 18894119
Just tried this, and it didn't even detect that...

        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.F3)
            {
                MessageBox.Show("F3 pressed");
            }
            else
            {
                MessageBox.Show(e.KeyCode.ToString());
            }
        }


This one has confused me, any ideas of what else I could try?
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Expert Comment

by:Babycorn-Starfish
ID: 18894147
Hi,

Are you handling any other events? or do you still have any code in there from your earlier attempts?
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Expert Comment

by:Babycorn-Starfish
ID: 18894154
also...

if you try creating a new project with aform and add the event handler in this new project and run it.. does that work - just trying to eliminate other causes :)

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LVL 16

Assisted Solution

by:AlexNek
AlexNek earned 200 total points
ID: 18894169
Don't forget to set KeyPreview property for the form to true; When you have form with the controls then focus /and keyboard events/ come to the active control.
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Expert Comment

by:Babycorn-Starfish
ID: 18894193
always something simple !
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Expert Comment

by:AlexNek
ID: 18894291
No, only somitimes :)
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Author Comment

by:Cyber-Drugs
ID: 18896153
That seems ot have done the trick, cheers!
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