判断一个字符串在另一个字符串中出现的次数 .

        /// <summary>
        /// 返回字符串在字符串中出现的次数
        /// </summary>
        /// <param name="Char">要检测出现的字符</param>
        /// <param name="String">要检测的字符串</param>
        /// <returns>出现次数</returns>

       public static int GetCharInStringCount(string Char, string String)
        {
            string str = String.Replace(Char, "");
            return (String.Length - str.Length) / Char.Length;

        }