/************************************************************************/ 
/* 
作者：覃小春 
時間：20080826 
說明：解決silverlightBeta2中TextBox中文輸入問題 
* blog:blog.csdn.net/colijian 
*/ 
/************************************************************************/ 
using System.Windows; 
using System.Windows.Controls; 
namespace TextBoxEx 
{ 
public class TextBoxEx:TextBox 
{ 
#region 屬性 
private string _OldText = ""; 
private int _RecSelectStart = 0; 
private int _RecSelectLength = 0; 
#endregion 
public TextBoxEx() 
{ 
TextChanged += new TextChangedEventHandler(TextBoxEx_TextChanged); 
SelectionChanged += new RoutedEventHandler(TextBoxEx_SelectionChanged); 
} 
void TextBoxEx_SelectionChanged(object sender, RoutedEventArgs e) 
{ 
TextBox _sender = sender as TextBox; 
if (_sender == null) 
return; 
if (_sender.SelectionLength > 0) 
{ 
//recode user select position 
_RecSelectLength = _sender.SelectionLength; 
_RecSelectStart = _sender.SelectionStart; 
} 
else 
{ 
_RecSelectLength = 0; 
} 
} 
void TextBoxEx_TextChanged(object sender, TextChangedEventArgs e) 
{ 
TextBox _sender = sender as TextBox; 
if (_sender == null) 
return; 
string textIfnor = _sender.Text; 
#region 除去先中部份 
if (_RecSelectLength != 0) 
{ 
_OldText = _OldText.Substring(0, _RecSelectStart) + _OldText.Substring(_RecSelectStart + _RecSelectLength, _OldText.Length - _RecSelectStart - _RecSelectLength); 
_RecSelectLength = 0; 
} 
#endregion 
int LengthAdd = textIfnor.Length - _OldText.Length; 
if (LengthAdd <= 0) 
{ 
_OldText = _sender.Text; 
//這種情況是刪除數據 
return; 
} 
else if (LengthAdd % 2 == 0) 
{ 
//如果當前是成雙的情況下 
//得到當前字符串 
string AddInfor = textIfnor.Substring(_sender.SelectionStart - LengthAdd, LengthAdd); 
if (!AddInfor.Substring(0, AddInfor.Length / 2).Equals(AddInfor.Substring(AddInfor.Length / 2))) 
{ 
_OldText = _sender.Text; 
return; 
} 
//得到實際新增值 
AddInfor = AddInfor.Substring(0, AddInfor.Length / 2); 
//得到實際理論值 
string DealText = textIfnor.Substring(0, _sender.SelectionStart - LengthAdd) + AddInfor + textIfnor.Substring(_sender.SelectionStart, textIfnor.Length - _sender.SelectionStart); 
int RecodeSelectSTart = _sender.SelectionStart - LengthAdd / 2; 
_sender.SelectionStart = 0; 
_sender.Text = DealText; 
_sender.SelectionStart = RecodeSelectSTart; 
_OldText = DealText; 
} 
else 
{ 
_OldText = _sender.Text; 
} 
} 
} 
} 

使用：

復制代碼代碼如下:

<UserControl x:Class="MutilTextBox.Page" 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
xmlns:CT="clr-namespace:TextBoxEx;assembly=TextBoxEx" 
Width="400" Height="300"> 
<Grid x:Name="LayoutRoot" Background="White"> 
<Grid.RowDefinitions> 
<RowDefinition Height="50"></RowDefinition> 
<RowDefinition Height="50"></RowDefinition> 
<RowDefinition Height="50"></RowDefinition> 
<RowDefinition Height="50"></RowDefinition> 
</Grid.RowDefinitions> 
<TextBox x:Name="FirstTextBox" Text="first" Grid.Row="0" TextChanged="FirstTextBox_TextChanged"></TextBox> 
<CT:TextBoxEx x:Name="SecondTextBox" Grid.Row="1"></CT:TextBoxEx> 
<CT:TextBoxEx x:Name="ThreeTextBox" Grid.Row="2"></CT:TextBoxEx> 
<TextBox x:Name="Four" Grid.Row="3" ></TextBox> 
</Grid> 
</UserControl> 