Selectioncolor在KeyPress事件中不起作用

本文关键字：不起作用 事件 KeyPress Selectioncolor | 更新日期: 2023-09-27 17:54:38

我试图改变一些文本的颜色时按Ctrl+Z如下:

private void richTextBox1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Z && (e.Control))
    {
        if (undoList.Count > 0)
        {
            ignoreChange = true;
            richTextBox1.Text = undoList[undoList.Count - 1];
            //richTextBox1.Focus();
            richTextBox1.SelectionStart = 3;
            richTextBox1.SelectionLength = 2;
            richTextBox1.SelectionColor = Color.Green;
            undoList.RemoveAt(undoList.Count - 1);
            ignoreChange = false;
        }   
    }
}

但是，所选文本不会改变其颜色。它会保持高亮。我在Click事件中加入了相同的逻辑，它起作用了。同样，如果我去掉ichTextBox1.SelectionColor = Color.Green;，一切都能正常工作。不知道为什么。任何帮助都会很感激。

Selectioncolor在KeyPress事件中不起作用

您想要处理命令键(Control)，而这在标准KeyPress事件中不会发生。要做到这一点，你必须覆盖ProcessCmdKey方法在你的表单。

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    if (keyData == (Keys.Control|Keys.Z))
    {
        if (undoList.Count > 0)
        {
            ignoreChange = true;
            richTextBox1.Text = undoList[undoList.Count - 1];
            //richTextBox1.Focus();
            richTextBox1.SelectionStart = 3;
            richTextBox1.SelectionLength = 2;
            richTextBox1.SelectionColor = Color.Green;
            undoList.RemoveAt(undoList.Count - 1);
            ignoreChange = false;
            // Do not handle base method
            // which will revert the last action
            // that is changing the selection to green.
            return true;
        }
    }
    return base.ProcessCmdKey(ref msg, keyData);
}
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