silverlight2.0Beta版TextBox输入中文解决方法

新写一个textboxex控件，继承于textbox，并对textbox的选择事件及字符改变事件做处理，以下是原代码

/************************************************************************/
/*
作者：覃小春
时间：20080826
说明：解决silverlightbeta2中textbox中文输入问题
* blog:blog.csdn.net/colijian
*/
/************************************************************************/
using system.windows;
using system.windows.controls;
namespace textboxex
{
public class textboxex:textbox
{
#region 属性
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;
//这种情况是删除数据
return;
}
else if (lengthadd % 2 == 0)
{
//如果当前是成双的情况下
//得到当前字符串
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;
}
//得到实际新增值
addinfor = addinfor.substring(0, addinfor.length / 2);
//得到实际理论值
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：

<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>

注意：要先加入名称空间，具体的值是：
clr-namespace:名称空间全名;assembly=程序集名称
不清楚怎样上传程序集！否则将程序集上传
若发此控件有问题，或是不足，请给我留言