文本框驗證表單

我有一些代碼，是爲了檢查某個字符的文本框，但由於某種原因，我有「KeyChar」和「已處理」的部分代碼的問題：文本框驗證表單

private void textBox5_Validating(object sender, CancelEventArgs e) 
{ 
    string allowedCharacterSet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890.\b\n"; 

    if (allowedCharacterSet.Contains(e.KeyChar.ToString())) 
    { 
     if (e.KeyChar.ToString() == "." 
      && textBox5.Text.Contains(".")) 
     { 
      e.Handled = true; 
     } 
    } 
    else 
    { 
     e.Handled = true; 
    } 

}

.............

Error 2 'System.ComponentModel.CancelEventArgs' does not contain a definition for 'KeyChar' and no extension method 'KeyChar' accepting a first argument of type 'System.ComponentModel.CancelEventArgs' could be found (are you missing a using directive or an assembly reference?) D:\test\Form1.cs 602 48 App

來源

2011-06-20 Dan

沒有物業類型上名爲CancelEventArgs KeyChar。 –

你爲什麼要問另一個問題，而不是修復你的原始問題：http://stackoverflow.com/questions/6414699/c-using-tryparseexact-with-windowsforms-textbox ?? –

如何使用正則表達式來代替？

private void TextBox5_Validating(object sender, System.EventArgs e) 
{ 
    String AllowedChars = @"^a-zA-Z0-9.$"; 
    if(Regex.IsMatch(TextBox5.Text, AllowedChars)) 
    { 
     e.Handled = true; 
    } 
    else 
    { 
     e.Handled = false; 
    } 
}

或者沿着這些線路的東西....

來源

2011-06-20 18:06:47 Marlon