.NET截取指定长度汉字超出部分以"..."代替

 1  ///   <summary> 
 2     ///   将指定字符串按指定长度进行剪切， 
 3     ///   </summary> 
 4     ///   <param   name= "oldStr "> 需要截断的字符串 </param> 
 5     ///   <param   name= "maxLength "> 字符串的最大长度 </param> 
 6     ///   <param   name= "endWith "> 超过长度的后缀 </param> 
 7     ///   <returns> 如果超过长度，返回截断后的新字符串加上后缀，否则，返回原字符串 </returns> 
 8     public static string StringTruncat(string oldStr, int maxLength, string endWith)
 9     {
10         if (string.IsNullOrEmpty(oldStr))
11             //   throw   new   NullReferenceException( "原字符串不能为空 "); 
12             return oldStr + endWith;
13         if (maxLength < 1)
14             throw new Exception("返回的字符串长度必须大于[0] ");
15         if (oldStr.Length > maxLength)
16         {
17             string strTmp = oldStr.Substring(0, maxLength);
18             if (string.IsNullOrEmpty(endWith))
19                 return strTmp;
20             else
21                 return strTmp + endWith;
22         }
23         return oldStr;
24     }