C# 取文本左边

        /// <summary>
        /// 取左边文本
        /// </summary>
        /// <param name="SumString">总文本</param>
        /// <param name="LeftString">左边文本</param>
        /// <returns>找到返回取出的左边文本，没找到返回空</returns>
        public static string GetLeftString(string SumString, string LeftString)
        {
            if (string.IsNullOrEmpty(SumString)) return "";
            if (string.IsNullOrEmpty(LeftString)) return "";

            int LeftIndex = SumString.IndexOf(LeftString);
            if (LeftIndex == -1) return "";
            return SumString.Substring(0, LeftIndex + LeftString.Length-1);
        }