我有一个文本框,希望只能输入数字。但如果我输入错误的数字,我无法使用退格键进行更正。如何允许使用退格键进行更正?谢谢。
private void amount_PaidTextBox_KeyPress(object sender, KeyPressEventArgs e)
{
if (Char.IsNumber(e.KeyChar) != true)
{
e.Handled = true;
}
}
if (Char.IsControl(e.KeyChar) != true && Char.IsNumber(e.KeyChar) != true)
{
e.Handled = true;
}
if (!Char.IsControl(e.KeyChar) && !Char.IsNumber(e.KeyChar))
{
e.Handled = true;
}
正确答案是:
private void amount_PaidTextBox_KeyPress(object sender, KeyPressEventArgs e)
{
e.Handled = !сhar.IsNumber(e.KeyChar) && (e.KeyChar != '\b');
}
你也可以覆盖TextChanged事件:
private void textBox1_TextChanged(object sender, EventArgs e)
{
string text = (sender as TextBox).Text;
StringBuilder builder = new StringBuilder(String.Empty);
foreach (char character in text)
{
if (Char.IsDigit(character))
{
builder.Append(character);
}
}
(sender as TextBox).Text = builder.ToString();
}
private void amount_PaidTextBox_KeyPress(object sender, KeyPressEventArgs e)
{
if (!Char.IsNumber(e.KeyChar) && e.KeyCode != Keys.Back)
e.Handled = True;
}
private void amount_PaidTextBox_KeyPress(object sender, KeyPressEventArgs e)
{
e.Handled = !(Char.IsNumber(e.KeyChar) || (e.KeyChar==Keys.Back));
}
private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if (!Char.IsDigit(e.KeyChar) & (e.KeyChar != 8)) e.Handled = true;
}
private void txt_KeyPress(object sender, KeyPressEventArgs e)
{
if (Char.IsDigit(e.KeyChar) || e.KeyChar == '\b')
{
// Allow Digits and BackSpace char
}
else
{
e.Handled = true;
}
}
参考链接:文本框掩码只接受小数 小数/12209854#12209854
点击您的文本框,然后输入事件 从事件中双击KeyPress 然后编写此代码
if( e.KeyChar <'0' || e.KeyChar > '9' )
if(e.KeyChar!=08)
e.Handled=true;