.net 后台json封装

1.数组封装json

 //封装json工具函数
 public static void setJson1(StringBuilder jsonResult, string key, string val){
           jsonResult.Append("{\"" + key + "\":\"" + val + "\"");
 }
 //封装json工具函数
 public static void setJson2(StringBuilder jsonResult, string key, string val){
        jsonResult.Append(",\"" + key + "\":" + val);
 }

StringBuilder json = new StringBuilder();

json.Append("[");
for (int i = 0; i < dt.Rows.Count; i++)
{
   Tools.setJson1(json, "id",dt.Rows[i]["Id"].ToString());
   Tools.setJson2(json,"cno",dt.Rows[i]["CNo"].ToString());
   Tools.setJson2(json,"cname",dt.Rows[i]["CName"].ToString());
   Tools.setJson2(json,"color",dt.Rows[i]["Color"].ToString());
   if (i == dt.Rows.Count - 1){
       json.Append("}");
   }
   else { json.Append("},"); }
}

json.Append("]");   

2.单个对象返回

 /*--json返回类,值均是字符串--*/
  public class JsonClass
  {
      private  Dictionary dic;
      private string toustr;
      public JsonClass() { dic = new Dictionary();toustr="{\"1\":\"1\"";}
      public void add(string key, string val) {
          dic.Add(key, val);
      }
      public string CreateJsonStr() {
          string backstr="";
          if (dic.Count < 0) return "";
          //通过键的集合取
          backstr+=toustr;
          foreach (string key in dic.Keys) {
              backstr += string.Format(",\"{0}\":\"{1}\"", key, dic[key]);
          }
          backstr += "}";
          return backstr;
      }
  }

JsonClass jc = new JsonClass();
 jc.add("imgtou", NH.getImg(dic["ImgUrl"].ToString(), SiteConfig.ERPUserPath));
 jc.add("brandname", dic["BrandName"].ToString());
 strData = jc.CreateJsonStr();
 strResult = "0";