asp.net 截取字符串代码

#region 截取字符串 
/// <summary> 
/// 截取字符串 
/// </summary> 
/// <param name="str_value"></param> 
/// <param name="str_len"></param> 
/// <returns></returns> 
public static string leftx(string str_value, int str_len) 
{ 
int p_num = 0; 
int i; 
string New_Str_value = ""; 
if (str_value == "") 
{ 
New_Str_value = ""; 
} 
else 
{ 
int Len_Num = str_value.Length; 
for (i = 0; i <= Len_Num - 1; i++) 
{ 
if (i > Len_Num) break; 
char c = Convert.ToChar(str_value.Substring(i, 1)); 
if (((int)c > 255) || ((int)c < 0)) 
p_num = p_num + 2; 
else 
p_num = p_num + 1; 
if (p_num >= str_len) 
{ 
New_Str_value = str_value.Substring(0, i + 1); 
break; 
} 
else 
{ 
New_Str_value = str_value; 
} 
} 
} 
return New_Str_value; 
} 
#endregion 
 
2，前台调用： 
 代码如下:

<%# UserInfo.DAL.SqlHelper.leftx(DataBinder.Eval(Container.DataItem,"Title").ToString(),20) %>