JQuery.Ajax()的data参数传递方式

 

最近，新学c# mvc，通过ajax post方式传递数据到controller。刚开始传递参数，controller中总是为null。现记录一下，可能不全，纯粹记个学习日记。

重点在于参数的方式，代码为例子

1、这里  dataType: "json"，表示返回的格式是json

前端： 
 var saveAlbum = function () {$.ajax({url: "/Home/PostAlbum",type: "POST",dataType: "json",data: { AlbumName: "shanghai", Entered: "5/9/2013" },success: function (result) {alert(result);},error: function (xhr, status, p3, p4) {var err = "Error " + " " + status + " " + p3;if (xhr.responseText && xhr.responseText[0] == "{")err = JSON.parse(xhr.responseText).message;alert(err);}});}

 controller： 

public ActionResult PostAlbum(test test){string str = String.Format("保存成功PostAlbum：{0} {1:d}", test.AlbumName, test.Entered);return Json(str);//--------对应请求中dataType: "json"，表示需要返回json类型//return String.Format("保存成功PostAlbum：{0} {1:d}", test.AlbumName, test.Entered);//------如果是string，则会报错}

2、ajax请求中还要一个重要的参数： contentType: "application/json",表示传入参数的格式

 var saveAlbumJson = function () {$.ajax({url: "/Home/PostAlbum",type: "POST",contentType: "application/json",dataType:"json",data: JSON.stringify({ "AlbumName": "shanghai", "Entered": "5/9/2013" }),success: function (result) {alert(result);},error: function (xhr, status, p3, p4) {var err = "Error " + " " + status + " " + p3;if (xhr.responseText && xhr.responseText[0] == "{")err = JSON.parse(xhr.responseText).message;alert(err);}});}

 [HttpPost]public ActionResult PostAlbum(test test){string str = String.Format("保存成功PostAlbum：{0} {1:d}", test.AlbumName, test.Entered);//传入test实体return Json(str);//return String.Format("保存成功PostAlbum：{0} {1:d}", test.AlbumName, test.Entered);}

 public class test{public string AlbumName { get; set; }public DateTime Entered { get; set; }}

3、如果要传入list<实体>，比如List<test>,需要把传入的data做转换

   var saveAlbumJsonList = function () {$.ajax({url: "/Home/AlbumList",type: "POST",contentType: "application/json",dataType: "json",data: JSON.stringify({"input":[{ AlbumName: "shanghai", Entered: "5/9/2013" },{...},{....}]}),success: function (result) {alert(result);},error: function (xhr, status, p3, p4) {var err = "Error " + " " + status + " " + p3;if (xhr.responseText && xhr.responseText[0] == "{")err = JSON.parse(xhr.responseText).message;alert(err);}});}

  public ActionResult PostAlbumList(List<test> input)//input必须要与data中数组中的key匹配{if (input != null){string str = String.Format("保存成功PostAlbum：{0} {1:d}", input[0].AlbumName, input[0].Entered);return Json(str);}else{return Json("参数获取错误！");}//return String.Format("保存成功PostAlbum：{0} {1:d}", test.AlbumName, test.Entered);}

4、由上面三个例子，很容易想到，传入多个list<实体>的方式

  function postEmployees() {$.ajax({type: "POST",url: "/Home/Employees",contentType: "application/json",dataType: "json",async: false,data: JSON.stringify({"Employees": [{ "Id": "1", "lastName": "Gates" }, { "Id": "2", "lastName": "Bush" }, { "Id": "3", "lastName": "Carter" }],"Employers": [{ "Id": "4", "lastName": "Gates" }, { "Id": "5", "lastName": "Bush" }, { "Id": "6", "lastName": "Carter" }]}),success: function (jsonResult) {alert(jsonResult);}});}

  [HttpPost]public async Task<ActionResult> Employees(List<Employee> Employees, List<Employee> Employers){return Json("Employees", JsonRequestBehavior.AllowGet);}

 public class Employee{public int Id { get; set; }public string FirstName { get; set; }public string LastName { get; set; }}