1 public class TextBoxInt : TextBox
2 {
3 public TextBoxInt()
4 {
5 KeyDown += TextBoxInt_KeyDown;
6 TextChanged += TextBoxInt_TextChanged;
7 }
8
9 private void TextBoxInt_TextChanged(object sender, TextChangedEventArgs e)
10 {
11 //屏蔽非法字符粘贴
12 var textBox = sender as TextBox;
13 if (textBox != null)
14 {
15 var change = new TextChange[e.Changes.Count];
16 e.Changes.CopyTo(change, 0);
17
18 int offset = change[0].Offset;
19 if (change[0].AddedLength > 0)
20 {
21 int num;
22 if (!int.TryParse(textBox.Text, out num))
23 {
24 textBox.Text = textBox.Text.Remove(offset, change[0].AddedLength);
25 textBox.Select(offset, 0);
26 }
27 }
28 }
29 }
30
31 private void TextBoxInt_KeyDown(object sender, KeyEventArgs e)
32 {
33 if (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9)
34 {
35 // 允许输入数字小键盘上的数字0-9
36 e.Handled = false;
37 }
38 else if ((e.Key >= Key.D0 && e.Key <= Key.D9) && e.KeyboardDevice.Modifiers != ModifierKeys.Shift)
39 {
40 // 允许输入数字0-9，并且不能同时按着Shift键
41 e.Handled = false;
42 }
43 else if (e.Key == Key.Enter)
44 {
45 // 允许输入回车
46 e.Handled = false;
47 }
48 else
49 {
50 e.Handled = true;
51 }
52 }
53 }
