c# - 禁用 RichTextBox WF 上的删除按钮

Question

我试图禁止人们删除富文本框中的文本框。该项目使用的是windows窗体。

这是我的代码:

    private void Form1_Load(object sender, EventArgs e)
    {

        richTextBox1.KeyPress += new KeyPressEventHandler(richTextBox1_KeyPress);
    }


    void richTextBox1_KeyPress(object sender, KeyPressEventArgs e)
    {
        if (e.KeyChar == (char)8)
        {
            e.Handled = true;
            MessageBox.Show("Try not to delete... write freely and openly");
            //The msgbox shows, but the delete still happens within the form.

        }
    }

不显示消息框并且不停止删除:

    private void Form1_Load(object sender, EventArgs e)
    {
        richTextBox1.KeyDown += new KeyEventHandler(richTextBox1_KeyDown);
    }
    private void richTextBox1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Delete)
        {
            e.Handled = true;
            MessageBox.Show("Delete Pressed");
            // Does not show message box...
        }
    }

Answer 1

根据 KeyPressEventArgs.KeyChar 上的 MSDN 文档，您无法使用该事件获取或设置 DELETE 键。您将需要使用 KeyEventArgs.KeyCode相反，订阅 KeyDown 和 KeyUp 事件。