C# 拼接json字符串以及ajax遍历二维json

Handler1.ashx

     public void ProcessRequest(HttpContext context)
     {

        context.Response.ClearContent();
        context.Response.ContentType = "text/plain";
        context.Response.Cache.SetCacheability(HttpCacheability.NoCache); //无缓存

        string UserID = context.Request.Params["UserID"];
        string Type = context.Request.Params["Type"];
        if (!string.IsNullOrEmpty(UserID)&&!string.IsNullOrEmpty(Type)) {

            switch (Type) {
                case "Select_lxl":
                    context.Response.Write(select_lxl(UserID));
                    break;
            }
        }
     }

  private string select_lxl(string UserID) {
        StringBuilder JSONstring = new StringBuilder();
        JSONstring.Append("[");//这里是开始位置
        JSONstring.Append("{");

        //已报名
        DataSet MyDataSet3 = xh.GetSetByUser(UserID);
        if (MyDataSet3 != null && MyDataSet3.Tables[0] != null && MyDataSet3.Tables[0].Rows.Count > 0)
        {

            DataTable tb = MyDataSet3.Tables[0];
            JSONstring.Append("\"yx\"");
            JSONstring.Append(":");
            JSONstring.Append("[");
            for (int i = 0; i < tb.Rows.Count; i++)
            {

                JSONstring.Append("{");
                JSONstring.Append("\"associationName\":\"" + tb.Rows[i]["associationName"] + "\",");
                JSONstring.Append("\"type\":\"" + tb.Rows[i]["type"].ToString() + "\",");
                JSONstring.Append("\"state\":\"" + tb.Rows[i]["state"].ToString() + "\",");
                JSONstring.Append("\"Signupid\":\"" + tb.Rows[i]["Signupid"].ToString() + "\"");
                JSONstring.Append("},");


            }

            JSONstring = new StringBuilder(JSONstring.ToString().TrimEnd(','));

            JSONstring.Append("],");


        }



        //可选兴趣协会
        DataSet MyDataSet = xh.GetSetByUserAndType(UserID, "1");
        if (MyDataSet != null && MyDataSet.Tables[0] != null && MyDataSet.Tables[0].Rows.Count > 0)
        {

            DataTable tb = MyDataSet.Tables[0];
            JSONstring.Append("\"兴趣协会\"");
            JSONstring.Append(":");
            JSONstring.Append("[");
            for (int i = 0; i < tb.Rows.Count; i++)
            {

                JSONstring.Append("{");
                JSONstring.Append("\"pic\":\"" + tb.Rows[i]["pic"] + "\",");
                JSONstring.Append("\"associationID\":\"" + tb.Rows[i]["associationID"].ToString() + "\",");
                JSONstring.Append("\"associationName\":\"" + tb.Rows[i]["associationName"].ToString() + "\"");
                JSONstring.Append("},");


            }

            JSONstring = new StringBuilder(JSONstring.ToString().TrimEnd(','));
            JSONstring.Append("],");


        }




        //可选兴趣协会
        DataSet MyDataSet2 = xh.GetSetByUserAndType(UserID, "2");
        if (MyDataSet2 != null && MyDataSet2.Tables[0] != null && MyDataSet2.Tables[0].Rows.Count > 0)
        {

            DataTable tb = MyDataSet2.Tables[0];
            JSONstring.Append("\"传统项目\"");
            JSONstring.Append(":");
            JSONstring.Append("[");
            for (int i = 0; i < tb.Rows.Count; i++)
            {

                JSONstring.Append("{");
                JSONstring.Append("\"pic\":\"" + tb.Rows[i]["pic"] + "\",");
                JSONstring.Append("\"associationID\":\"" + tb.Rows[i]["associationID"].ToString() + "\",");
                JSONstring.Append("\"associationName\":\"" + tb.Rows[i]["associationName"].ToString() + "\"");
                JSONstring.Append("},");


            }

            JSONstring = new StringBuilder(JSONstring.ToString().TrimEnd(','));
            JSONstring.Append("]");


        }

        if (JSONstring.ToString().EndsWith(",")) { JSONstring = new StringBuilder(JSONstring.ToString().TrimEnd(',')); }


        JSONstring.Append("}");
        JSONstring.Append("]");
        return JSONstring.ToString();
    }

jquery

    $.ajax({
    url: "ajax/Handler1.ashx?time=" + new Date().getTime(),
    contentType: "application/json; charset=utf-8",
    data: { UserID: 222, Type: "Select_lxl" },
    dataType: "json",
    success: function (data) {
        //alert(data);
        var html_yx = "";
        $.each(data, function (index, item) {

            $.each(item, function (i, t) {
                html_yx = "";
                if (i == "yx") {

                    $.each(t, function (n, t) {

                        html_yx += " <div class=\"div_yx\">";
                        html_yx += "               <p class=\"p_up\">";
                        html_yx += "                     <span>" + t.associationName + "</span>";
                        html_yx += "          </p>";
                        html_yx += "              <p class=\"p_down\">";
                        html_yx += t.type == "1" ? "<input type='checkbox' name='xqxh' value='0' checked='checked' style='display:none' />" : "";
                        html_yx += "                     <span>" + (t.state == "1" ? "<span class='yx_zt'>审批中</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type='button' class='but_del' onclick=\"yxbut(" + t.Signupid + ", 'delete')\" value='删除' />" : "<span>已通过</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type='button' class='but_del'  onclick=\"yxbut(" + t.Signupid + ",'update')\" value='退出' />") + "</span>";
                        html_yx += "                  </p>";
                        html_yx += "             </div>";
                    });
                    $(".yx").html(html_yx);
                }
                else {

                    html_yx += "<div class=\"xqxh_div\">";
                    html_yx += " <h2>" + i + "</h2>";
                    html_yx += "<div class=\"xqxh_list\">";

                    $.each(t, function (n, t) {

                        html_yx += " <a><i style=\"background:url(image/icon/" + t.pic + ");background-size: 100%;\"></i><span>";
                        html_yx += "            <input type=\"checkbox\" name=\"" + (i == "传统项目" ? "ctxm" : "xqxh") + "\" value=" + t.associationID + " />";
                        html_yx += "            &nbsp;" + t.associationName + "</span></a>";

                    })

                    html_yx += "</div>";
                    html_yx += "</div>";


                    $(".kxxh").append(html_yx);
                }
            });
        });
    },
    error: function () {
        //alert("错误");
    }
});