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(/(
)/g, "\n").replace(/(
)/g, "\r").replace(/( )/g, "\t") + """; if (typeof o == "object") { if (!o.sort) { for (var i in o) r.push(""" + i + "":" + jsonParseString(o[i])); if (!!document.all && !/^
?functions*toString()s*{
?s*[native code]
?s*}
?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);}); |