如何在TextBox中写入时在ListView上聚焦箭头键？

Question

我有一个包含TextBox和ListView的简单Windows窗体。

我希望允许用户在关注ListView时将文本写入TextBox（在使用键盘箭头键控制ListView的同时在TextBox中键入文本）。

我该怎么做？

Answer 1

为您的表单实施IMessageFilter并在适当时更改目标收件人：

public partial class form1 : Form, IMessageFilter 
{

    private NativeWindow nw = null;

    public form1()
    {
        InitializeComponent();

        nw = new NativeWindow();
        nw.AssignHandle(this.listView1.Handle);
        Application.AddMessageFilter(this);

        // so you can see the selection moving when the arrow keys are pressed in the TextBox
        this.listView1.HideSelection = false;
        this.listView1.Items[0].Selected = true;
    }

    private const int WM_KEYDOWN = 0x100;
    private const int WM_KEYUP = 0x101;

    public bool PreFilterMessage(ref Message m)
    {
        if (m.HWnd.Equals(this.textBox1.Handle))
        {
            switch (m.Msg)
            {
                case WM_KEYDOWN:
                case WM_KEYUP:
                    switch ((Keys)m.WParam)
                    {
                        case Keys.Up:
                        case Keys.Down:
                        case Keys.Right:
                        case Keys.Left:                               
                            m.HWnd = this.listView1.Handle; // change the handle to the ListView
                            nw.DefWndProc(ref m); // send the message to the ListView
                            return true; // suppress handling by the TextBox
                            break;
                    }
                    break;
            }
        }
        return false;
    }

}