c# 数据拼接成键值对格式

  public static object FindLayoutTypes()
        {
            //地鼓、地裂、墙裂、井水、泉水
            var sb = new StringBuilder();
            sb.Append(getlayoutType("DG", "地鼓"));
            sb.Append(getlayoutType("DL", "地裂"));
            sb.Append(getlayoutType("QL", "墙裂"));
            sb.Append(getlayoutType("JS", "井水"));
            sb.Append(getlayoutType("QS", "泉水"));

            string str = sb.ToString();
            if (str.EndsWith(",")) str = str.TrimEnd(',');
            return "[" + str + "]";//输出结果[{"key":"DG","value":"地鼓"},{"key":"DL","value":"地裂"},{"key":"QL","value":"墙裂"},{"key":"JS","value":"井水"},{"key":"QS","value":"泉水"}]
        }

        private static string getlayoutType(string key, string name)
        {
            return "{" + string.Format("\"key\":\"{0}\",\"value\":\"{1}\"", key, name) + "},";

        }