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[] == "{")
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[] == "{")
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[] == "{")
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[].AlbumName, input[].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": "", "lastName": "Gates" }, { "Id": "", "lastName": "Bush" }, { "Id": "", "lastName": "Carter" }],
"Employers": [{ "Id": "", "lastName": "Gates" }, { "Id": "", "lastName": "Bush" }, { "Id": "", "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; }
}