private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
switch(e.KeyValue)
{
case 110:
case 190:
...........
break; }
{
switch(e.KeyValue)
{
case 110:
case 190:
...........
break; }
{
MessageBox.Show("已经有点了。")!
e.Handle=true;
}
{
if((char)e.KeyValue!='.')
e.Handled=true;
}