1 public class TextBoxDouble : TextBox
2 {
3 public TextBoxDouble()
4 {
5 KeyDown += TextBoxDouble_KeyDown;
6 TextChanged += TextBoxDouble_TextChanged;
7 }
8
9 private void TextBoxDouble_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 double num;
22 if (!Double.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 TextBoxDouble_KeyDown(object sender, KeyEventArgs e)
32 {
33 var txt = sender as TextBox;
34 if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key == Key.Decimal)
35 {
36 // 允许输入小键盘数字0-9或者点号
37 if (txt != null && (txt.Text.Contains(".") && e.Key == Key.Decimal))
38 {
39 // 不允许输入多个点号
40 e.Handled = true;
41 return;
42 }
43 e.Handled = false;
44 }
45 else if (((e.Key >= Key.D0 && e.Key <= Key.D9) || e.Key == Key.OemPeriod) &&
46 e.KeyboardDevice.Modifiers != ModifierKeys.Shift)
47 {
48 // 允许输入数字0-9或者点号 并且不能按着Shift
49 if (txt != null && (txt.Text.Contains(".") && e.Key == Key.OemPeriod))
50 {
51 // 不允许输入多个点号
52 e.Handled = true;
53 return;
54 }
55 e.Handled = false;
56 }
57 else if (e.Key == Key.Enter)
58 {
59 // 允许输入回车
60 e.Handled = false;
61 }
62 else
63 {
64 e.Handled = true;
65 }
66 }
67 }
