C# 通過KeyPress事件，限制TextBox僅能輸入數字

…

撰寫KeyPress事件，實現限制輸入數字功能

(char)48 --> 數字 0    (char)49 --> 數字 1
(char)50 --> 數字 2    (char)51 --> 數字 3
(char)52 --> 數字 4    (char)53 --> 數字 5
(char)54 --> 數字 6    (char)55 --> 數字 7
(char)56 --> 數字 8    (char)57 --> 數字 9
(char) 8 --> backspace (char)46 --> . (point)
更多相關對應參考Ascii table



private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if (e.KeyChar == (Char)48 || e.KeyChar == (Char)49 ||
        e.KeyChar == (Char)50 || e.KeyChar == (Char)51 ||
        e.KeyChar == (Char)52 || e.KeyChar == (Char)53 ||
        e.KeyChar == (Char)54 || e.KeyChar == (Char)55 ||
        e.KeyChar == (Char)56 || e.KeyChar == (Char)57 ||
        e.KeyChar == (Char)8  || e.KeyChar == (Char)46)
    {
        e.Handled = false;  //允許textBox1物件接受按鍵
    }
    else
    {
        e.Handled = true;   //不允許textBox1物件接受按鍵
    }
}