Datatable转换为Json 然后把Json数据放入 js 文件中

C#中把Datatable转换为Json的5个代码实例

        /// <summary>
        /// Datatable转换为Json
        /// </summary>
        /// <param name="table">Datatable对象</param>
        /// <returns>Json字符串</returns>
        public static string ToJson(DataTable dt)
        {
            StringBuilder jsonString = new StringBuilder();
            jsonString.Append("[");
            DataRowCollection drc = dt.Rows;
            for (int i = 0; i < drc.Count; i++)
            {
                jsonString.Append("{");
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    string strKey = dt.Columns[j].ColumnName;
                    string strValue = drc[i][j].ToString();
                    Type type = dt.Columns[j].DataType;
                    jsonString.Append("\"" + strKey + "\":");
                    strValue = StringFormat(strValue, type);
                    if (j < dt.Columns.Count - 1)
                    {
                        jsonString.Append(strValue + ",");
                    }
                    else
                    {
                        jsonString.Append(strValue);
                    }
                }
                jsonString.Append("},");
            }
            jsonString.Remove(jsonString.Length - 1, 1);
            jsonString.Append("]");
            return jsonString.ToString();
        }
        /// <summary>
        /// 格式化字符型、日期型、布尔型
        /// </summary>
        /// <param name="str"></param>
        /// <param name="type"></param>
        /// <returns></returns>
        private static string StringFormat(string str, Type type)
        {
            if (type == typeof(string))
            {
                str = String2Json(str);
                str = "\"" + str + "\"";
            }
            else if (type == typeof(DateTime))
            {
                str = "\"" + str + "\"";
            }
            else if (type == typeof(bool))
            {
                str = str.ToLower();
            }
            else if (type != typeof(string) && string.IsNullOrEmpty(str))
            {
                str = "\"" + str + "\"";
            }
            return str;
        }
        /// <summary>
        /// 过滤特殊字符
        /// </summary>
        /// <param name="s">字符串</param>
        /// <returns>json字符串</returns>
        private static string String2Json(String s)
        {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < s.Length; i++)
            {
                char c = s.ToCharArray()[i];
                switch (c)
                {
                    case '\"':
                        sb.Append("\\\""); break;
                    case '\\':
                        sb.Append("\\\\"); break;
                    case '/':
                        sb.Append("\\/"); break;
                    case '\b':
                        sb.Append("\\b"); break;
                    case '\f':
                        sb.Append("\\f"); break;
                    case '\n':
                        sb.Append("\\n"); break;
                    case '\r':
                        sb.Append("\\r"); break;
                    case '\t':
                        sb.Append("\\t"); break;
                    default:
                        sb.Append(c); break;
                }
            }
            return sb.ToString();
        }  

<2>

//从数据库里查询出省名
            var sql = "select top 35 locid,locname,parentid from location where loctype=1";
            var dt_pro = SQLHelper.Get_DataTable(sql, SQLHelper.GetCon(), new Dictionary<string, DBParam>());
            //将dt_pro这个DataTable转换成json
            var tt_pro = ToJson(dt_pro);

            //查询出城市的名称
            var vsql = "select locid,locname,parentid from location where parentid in (select top 35 locId from location where loctype=1) ";

            var dt_city = SQLHelper.Get_DataTable(vsql, SQLHelper.GetCon(), new Dictionary<string, DBParam>());
            //将dt_city这个DataTable转换成json
            var tt_city = ToJson(dt_city);

<3> 建立一个js 文件 在文件里  写两个变量 var cn_pro，和var cn_city 将 tt_pro的值赋值给 cn_pro ,将tt_city的值赋值 cn_city 就成了一个js 文件了

js内如入 var cn_pro = [{ "locid": 1, "locname": "北京", "parentid": 0 }, { "locid": 673, "locname": "上海", "parentid": 0 }];

var cn_city = [{ "locid": 2, "locname": "北京", "parentid": 1 }, { "locid": 674, "locname": "上海", "parentid": 673 }]

当然我这是简写的，里面的内如大多都去掉了。就保留了前面2条数据做示例

================================================================

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/MemberCenter.Master"
     Inherits="System.Web.Mvc.ViewPage<bigtree.Model.MemberDetail>"%>
    <%@ Import Namespace="bigtree" %>
<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">

    <% using (Html.BeginForm()) {%>

    <div class="rightCon">
        <div class="nowTil">
            <h3>
                个人资料</h3>
        </div>
        <ul class="memForm">
            <li>
                <p class="setterTil">
                    手机：</p>
                <div class="setterBd">
                    <%--<input type="text" class="setterInput fl" value="" readonly="">--%>
                    <%: Html.TextBoxFor(x => x.Mobile, new { @class = "setterInput fl" ,@readonly=""})%>

                    <div class="setterExplain">
                        (请填写真实入住人姓名，每间房只填写以为即可)</div>
                </div>
            </li>
            <li>
                <p class="setterTil">
                    姓名：</p>
                <div class="setterBd">
                    <%--<input type="text" class="setterInput fl" value="张小凡" readonly="">--%>
                    <%: Html.TextBoxFor(x => x.Name, new { @class = "setterInput fl"})%>
                </div>
            </li>
            <li>
                <p class="setterTil">
                    邮箱：</p>
                <div class="setterBd">
                   <%-- <input type="text" class="setterInput fl">--%>
                    <%: Html.TextBoxFor(x => x.Email, new { @class = "setterInput fl" })%>

                        <% var i = Model.EmailFlag;
                           if (i == true)
                           { %>

                            <div class="setterExplain">已验证</div>

                           <% }%> 

                           <% else {%>
                              <div class="setterExplain">未验证</div>
                           <% }%>               

                </div>
            </li>
            <li>
                <p class="setterTil">
                    昵称：</p>
                <div class="setterBd">
                    <%--<input type="text" class="setterInput fl">--%>
                    <%: Html.TextBoxFor(x=>x.UserName,new {@class="setterInput fl"}) %>
                </div>
            </li>
            <li>
                <p class="setterTil">
                    性别：</p>
                <div class="setterBd">
                    <label class="sex">
                        <%--<input type="radio" name="sex">--%>
                        <%:Html.RadioButtonFor(x=>x.Sex,"男", new{@name="sex"})%>
                        男</label>
                    <label class="sex">
                        <%--<input type="radio" name="sex">--%>
                        <%: Html.RadioButtonFor(x=>x.Sex,"女", new{@name="sex"})%>
                        女</label>
                </div>
            </li>
            <% var province = ViewData["province"] as System.Data.DataTable;%>
            <li>
                <p class="setterTil">
                    常用出发城市：</p>
                <div class="setterBd">
                    <div class="selectBox sp1 fl">
                        <p id="displyPro" class="getNum sp3">
                            北京</p>
                        <div class="xjt">
                        </div>
                        <ul id="proList" class="selectSlideBox none sp3" style="">
                        </ul>
                    </div>
                    <div class="setterExplain sp">
                        省</div>
                    <div class="selectBox sp1 fl">
                        <p id="displyCity" class="getNum sp3">
                            北京</p>
                        <div class="xjt">
                        </div>
                        <ul id="cityList" class="selectSlideBox none sp3" style="">
                        </ul>
                    </div>
                    <div class="setterExplain">
                        市</div>
                </div>
            </li>
        </ul>
        <input type="hidden" id="selectCityId" value="1" />
        <input type="hidden" id="selectCityName" value="北京" />
        <input type="submit" value="保存" class="saveBtn">
    </div>
    <% } %>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="head" runat="server">

    <script type="text/javascript">
        $(function () {
            $(".navList > :contains('个人资料')").addClass("cur");

            // set province
            var proList = "";
            $.each(cn_pro, function (i, kv) {
                proList += "<li data-id='" + kv.locid + "'>" + kv.locname + "</li>";
            });

            $("#proList").html(proList);

            $("#proList li").bind("click", function () {
                var li = $(this);
                var cityList = "";
                $.each(cn_city, function (i, kv) {
                    if (kv.parentid == li.attr("data-id")) {
                        cityList += "<li data-id='" + kv.locid + "'>" + kv.locname + "</li>";
                    }
                });
                $("#cityList").html(cityList);
                $("#displyPro").text(li.text());
                $("#displyCity").text($("#cityList").children().first().text());

                $("#selectCityId").val($("#cityList").children().first().attr("data-id"));
                $("#selectCityName").val($("#cityList").children().first().text());

                $("#cityList li").bind("click", function () {

                    $("#displyCity").text($(this).text());

                    $("#selectCityId").val($(this).attr("data-id"));
                    $("#selectCityName").val($(this).text());

                });
            });

        })
    </script>
    <script type="text/javascript" src="../../Scripts/Location.js"></script>
</asp:Content>