c# - 如果 TextBox 为空或已经为 0，如何禁止用户在 TextBox 上插入 0？

Question

我需要检查如果我的 TextBox (txtmoney) 为空或等于 0，则不允许按 0 键键盘或数字 0。

我该怎么做？

Answer 1

Before implementing please refer TextChanged & KeyPress

如果你不想让0被输入那么

 private void txtBox_KeyPress(object sender, KeyPressEventArgs e)
 {
    e.Handled = (e.KeyChar == '0');
 }

要处理您可以尝试的文本框文本是

 private void txtBox_TextChanged(object sender, KeyPressEventArgs e)
 {
    if (String.IsNullOrEmpty(textbox.Text) || txtmoney.Text == "0")
    {
        // Do Something 
    }
 }

Note: if you are using winform don't forget to subscribe those event in your code. Example:-

txtBox.KeyPress += txtBox_KeyPress;
txtBox.TextChanged += txtBox_TextChanged;