winforms - C# capture main form keyboard events

Question

How to catch keyboard events of the WinForm main form, where other controls are. So I want to catch one event Ctrl + S and doesn't matter where focus is. But without Pinvoke (hooks and such ...) Only .NET managed internal power.

Answer 1

Try this code. Use the interface IMessageFilter you can filter any ctrl+key.

public partial class Form1 : 
    Form,
    IMessageFilter
{
    public Form1()
    {
        InitializeComponent();

        Application.AddMessageFilter(this);
        this.FormClosed += new FormClosedEventHandler(this.Form1_FormClosed);
    }

    private void Form1_FormClosed(object sender, FormClosedEventArgs e)
    {
        Application.RemoveMessageFilter(this);
    }

    public bool PreFilterMessage(ref Message m)
    {
        //here you can specify  which key you need to filter

        if (m.Msg == 0x0100 && (Keys)m.WParam.ToInt32() == Keys.S &&
            ModifierKeys == Keys.Control) 
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

I tested this and worked for me.