DataTabe转JSON

代码附上：

 public static string DataTableToJSON(DataTable dt, string dtName)
    {
        StringBuilder sb = new StringBuilder();
        StringWriter sw = new StringWriter(sb);
        using (JsonWriter jw = new JsonTextWriter(sw))
        {
            JsonSerializer ser = new JsonSerializer();
            jw.WriteStartObject();
            jw.WritePropertyName(dtName);
            jw.WriteStartArray();
            foreach (DataRow dr in dt.Rows)
            {
                jw.WriteStartObject();
                foreach (DataColumn dc in dt.Columns)
                {
                    jw.WritePropertyName(dc.ColumnName);
                    ser.Serialize(jw, dr[dc].ToString());
                }
                jw.WriteEndObject();
            }
            jw.WriteEndArray();
            jw.WriteEndObject();
            sw.Close();
            jw.Close();
        }
        return sb.ToString();
    }

dt:需要转换的DataTable的数据源

dtName:附加JSON名。（YY：区分JSON传送的数据用的）

2：在Jquery使用这JSON就有些麻烦

    需要用2个for循环调出里面的数据

for (var i in json) {
        for (var j in json[i]) {
            lew += '<li><a href=News.aspx?newid=' + json[i][j].newsid + '>';
            lew += json[i][j].title + '</li>';
        }
    }