https://www.jb51.net/article/63086.htm

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/// <summary> 
/// 擷取文字，區分中英文字元，中文算兩個長度，英文算一個長度
/// </summary>
/// <param name="str">待擷取的字串</param>
/// <param name="length">需計算長度的字串</param>
/// <returns>string
 
</returns>
public static string GetSubString(string str,int length)
{
  string temp = str;
  int j = 0;
  int k = 0;
  for (int i = 0; i < temp.Length; i++)
  {
 if (Regex.IsMatch(temp.Substring(i,1),@"[\u4e00-\u9fa5]+"))
 {
   j += 2;
 }
 else
 {
   j += 1;
 }
 if (j <= length)
 {
   k += 1;
 }
 
 
if (j > length)
 {
   return temp.Substring(0,k) + "..";
 }
  }
  return temp;
}