C# 删除字符串中的中文

 /// <summary>
 /// 删除字符串中的中文
 /// </summary>
 public static string Delete中文(string str)
 {
     string retValue = str;
     if (System.Text.RegularExpressions.Regex.IsMatch(str, @"[\u4e00-\u9fa5]"))
     {
         retValue = string.Empty;
         var strsStrings = str.ToCharArray();
         for (int index = ; index < strsStrings.Length; index++)
         {
             if (strsStrings[index] >= 0x4e00 && strsStrings[index] <= 0x9fa5)
             {
                 continue;
             }
             retValue += strsStrings[index];
         }
     }
     return retValue;
 }