如何取消先前聚焦的文本框的焦点

本文关键字：聚焦 文本 焦点 何取消 取消 | 更新日期: 2023-09-27 18:12:32

我有一个文本框，应该只包含数字。检查在Leave事件中进行。如果文本框中包含字符而不是数字，则提示用户检查其输入并再次尝试，同时保持对文本框的关注。

问题是，如果用户按下取消，文本框仍然保持焦点，不能在表单的其他地方单击。如果他删除文本框的内容，也会发生同样的情况。我做错了什么?希望能得到一些帮助!提前感谢!

private void whateverTextBox_Leave(object sender, EventArgs e)
    {
        //checks to see if the text box is blank or not. if not blank the if happens
        if (whateverTextbox.Text != String.Empty)
        {
            double parsedValue;
            //checks to see if the value inside the checkbox is a number or not, if not a number the if happens
            if (!double.TryParse(whateverTextbox.Text, out parsedValue))
            {
                DialogResult reply = MessageBox.Show("Numbers only!" + "'n" + "Press ok to try again or Cancel to abort the operation", "Warning!", MessageBoxButtons.OKCancel, MessageBoxIcon.Exclamation);
                //if the user presses ok, textbox gets erased, gets to try again
                if (reply == DialogResult.OK)
                {
                    whateverTextbox.Clear();
                    whateverTextbox.Focus();
                }
                //if the user presses cancel, the input operation will be aborted
                else if (reply == DialogResult.Cancel)
                {
                    whateverTextbox.Clear();
                    //whateverTextbox.Text = String.Empty;
                    //nextTextBox.Focus();
                }
            }
        }
    }

如何取消先前聚焦的文本框的焦点

为什么不这样做呢:

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if (!char.IsDigit(e.KeyChar) && e.KeyChar != (char)Keys.Back)
    {
        e.Handled = true;
        MessageBox.Show("Numbers only!" + "'n" + "Press ok to try again or Cancel to abort the operation", "Warning!");
    }
}
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