下面是WPF中用于数字输入的库

它具有NumberStyles和regexpattern等用于验证的属性。

WPF文本框的子类

我允许数字键盘号码和退格:

    private void TextBox_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        int key = (int)e.Key;

        e.Handled = !(key >= 34 && key <= 43 || 
                      key >= 74 && key <= 83 || 
                      key == 2);
    }

我们可以对文本框更改事件进行验证。下面的实现可以防止除数字和一个小数点以外的按键输入。

private void textBoxNumeric_TextChanged(object sender, TextChangedEventArgs e) 
{         
      TextBox textBox = sender as TextBox;         
      Int32 selectionStart = textBox.SelectionStart;         
      Int32 selectionLength = textBox.SelectionLength;         
      String newText = String.Empty;         
      int count = 0;         
      foreach (Char c in textBox.Text.ToCharArray())         
      {             
         if (Char.IsDigit(c) || Char.IsControl(c) || (c == '.' && count == 0))             
         {                 
            newText += c;                 
            if (c == '.')                     
              count += 1;             
         }         
     }         
     textBox.Text = newText;         
     textBox.SelectionStart = selectionStart <= textBox.Text.Length ? selectionStart :        textBox.Text.Length;     
} 

e.Handled = (int)e.Key >= 43 || (int)e.Key <= 34;

在预览文本框的按键事件。

当检查数字值时，您可以使用VisualBasic。IsNumeric函数。

这个怎么样?很适合我。希望我没有漏掉任何边缘情况……

MyTextBox.PreviewTextInput += (sender, args) =>
{
    if (!int.TryParse(args.Text, out _))
    {
        args.Handled = true;
    }
};

DataObject.AddPastingHandler(MyTextBox, (sender, args) =>
{
    var isUnicodeText = args.SourceDataObject.GetDataPresent(DataFormats.UnicodeText, true);
    if (!isUnicodeText)
    {
        args.CancelCommand();
    }

    var data = args.SourceDataObject.GetData(DataFormats.UnicodeText) as string;
    if (!int.TryParse(data, out _))
    {
        args.CancelCommand();
    }
});