前台和后台数据传递综合总结

1.前台将Json字符串数据传递到后台进行处理

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//var Json = '{"User":[{"UserName":"a","PassWord":"a"},{"UserName":"b","PassWord":"b"}]}';这是前台             string json = Request.Form["Json"];             JObject o = (JObject)JsonConvert.DeserializeObject(json);             JToken arr = (JToken)o["User"];//此地返回的是多条记录，所以要遍历             foreach (var token in arr)             {                 Person p = JsonConvert.DeserializeObject<Person>(token.ToString());                 //在此对p进行增删改操作,p已经是一个实体类的实例             }             Response.End();

对Json字符串进行后台处理，需要应用到程序集Newtonsoft.Json.dll

另外：如果是一条记录的Json，处理方式是：

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//var Json = '{"UserName":"c","PassWord":"c"}';这是前台             string json = Request.Form["Json"];             JObject o = (JObject)JsonConvert.DeserializeObject(json);             JToken arr = (JToken)o;//此地返回的是一条记录，不进行选项选择都是一条，不用遍历             Person p = JsonConvert.DeserializeObject<Person>(arr.ToString());             //在此对p进行增删改操作,p已经是一个实体类的实例             Response.End();

 2.组织对象，然后转换为Json字符串

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var opts = {                     UserName: "d",                     PassWord:"d"                 };                 var json = jsonParseString(opts);

 方法jsonParseString 代码如下

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//JSON对象转字符串 function jsonParseString(o) {     try {         if (o == undefined) { return ""; }         var r = [];         if (typeof o == "string") return "\"" + o.replace(/([\"\\])/g, "\\$1").replace(/(\n)/g, "\\n").replace(/(\r)/g, "\\r").replace(/(\t)/g, "\\t") + "\"";         if (typeof o == "object") {             if (!o.sort) {                 for (var i in o)                     r.push("\"" + i + "\":" + jsonParseString(o[i]));                 if (!!document.all && !/^\n?function\s*toString\(\)\s*\{\n?\s*\[native code\]\n?\s*\}\n?\s*$/.test(o.toString)) {                     r.push("toString:" + o.toString.toString());                 }                 r = "{" + r.join() + "}"             } else {                 for (var l = 0; l < o.length; l++)                     r.push(jsonParseString(o[l]))                 r = "[" + r.join() + "]";             }             return r;         }         return o.toString().replace(/\"\:/g, '":""');     } catch (e) { return e.Message; } }

 最终生成的json字符串为:var Json = '{"UserName":"d","PassWord":"d"}',满足传递到后台的需求

3.前台直接传递到自己的后台，添加Response.End();可以防止传递HTML到前台

4.后台将数据转换为Json传递到前台

这是后台代码:

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protected void Page_Load(object sender, EventArgs e) {     if (Request.Form["Type"] == "GetJson")     {         Person p = new Person();         p.UserName = "e";         p.PassWord = "e";         string json = JsonConvert.SerializeObject(p);//此处将对象转换为Json了         Response.Write(json);         Response.End();     } }

注意还可以将对象集合转换为Json，实例代码：

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List<Person> persons = new List<Person>(); Person p = new Person(); p.UserName = "f"; p.PassWord = "f"; persons.Add(p); persons.Add(p); string json = JsonConvert.SerializeObject(persons);//此处将对象转换为Json了 内容为 "[{\"UserName\":\"f\",\"PassWord\":\"f\"},{\"UserName\":\"f\",\"PassWord\":\"f\"}]" Response.Write(json); Response.End();

同时他还可以将DataTable转换为Json字符串，实例代码如下：

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protected void Page_Load(object sender, EventArgs e) {     if (Request.Form["Type"] == "GetJson")     {         DataTable dt = ZXGA.Utility.DbHelperOleDb.Query(App_Init.ConnStr(),"select * from jjdwb").Tables[0];         string json = JsonConvert.SerializeObject(dt);         Response.Write(json);         Response.End();     } }

 

下面是前台代码:

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$.post("test2.aspx", { Type: "GetJson" }, function (data) {     //var obj = $.parseJSON(data);//方法一     var obj = eval('(' + data + ')'); //方法二     alert(obj.UserName); });