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How to use key pressing on a form (Escape, Control and Help F1) (Windows and Linux)

By , 4 Jul 2011
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There are various ways to use key pressing on a form using C#.
Here is an example:
 
Select properties of Form and select 'KeyPreview' and change it from 'false' to 'true'. By default, its value is false. Then write the below code in the KeyUp event of the Form:
 
public static string HelpPath = Application.StartupPath + Path.DirectorySeparatorChar + "Help" // Help Folder Name

// Folders Structure
// Exe File
//    |-> Help Folder
//            | -> HelpFile.chm

private void frmMain_KeyUp(object sender, KeyEventArgs e)
        {
            try
            {
                if (e.KeyCode == Keys.Escape) // Escape button
                {
                    This.Close;
                }
 
                if (e.KeyData == (Keys.Control  | Keys.S)) // Control + S
                {
                    if (boolIPWrite == true) // Permission to write
                    {
                        BtSave_Click(sender, e); // Save button
                    }
                }
 
                if (e.KeyCode == Keys.F1) // F1 - Help Information
                {
                    try
                    {
                        System.Diagnostics.Process.Start(strHelpPath + Path.DirectorySeparatorChar + System.Reflection.Assembly.GetExecutingAssembly().GetName().Name.ToString() + ".chm");
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show("ERROR # " + ex.Message.ToString() + Environment.NewLine + Environment.NewLine + strHelpPath + Path.DirectorySeparatorChar + System.Reflection.Assembly.GetExecutingAssembly().GetName().Name.ToString() + ".chm", this.Text.ToString(), MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    }
                }
            }
            catch
            { }
        }
 

 
Note: Works in Windows and Linux (with mono installed).

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Nelson Kosta Souto
Engineer
Portugal Portugal
My name is Nelson Souto, I develop software for fun and profit since 1992.

Comments and Discussions

 
QuestionArticle? Hardly. Snippet at best. Pinmembertlhintoq12-Jul-11 6:39 

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