将列表和字符串数据从Ajax传递到MVC 4中的控制器，列表是否为NULL? [英] passing List and String data from ajax to controller in mvc 4, getting NULL for list?

问题描述

我是JavaScript和MVC的新手，我正在尝试将List和string传递给我的控制器.

Hi I'm new to JavaScript and MVC, and I'm trying to pass List and string to my controller.

JavaScript如下:

JavaScript looks like:

 var parms = {
                  globalList: globalList,
                  fieldName: fieldName
              };
              $.ajax({
                  //contentType: 'application/json; charset=utf-8',
                  type: "POST",
                  traditional: true,
                  url: "/Home/SaveField",
                  async: false,
                  data: parms,
                  dataType: "json",
                  success: function (data) {
                      console.log("uspjeh");
                  },
                  error: function (errorData) {
                      console.log("errors");
                  }

              });
          });

和控制器看起来像:

public void SaveField(List<Point> globalList, String fieldName)
{
  // filedName is correctly passed
  // list is null
}

有人可以帮我吗?

积分班:

public class Point
{
  [Key]
  public int PointId { get; set; }
  public float GeoDuzina { get; set; }
  public float GeoSirina { get; set; }
  [ForeignKey("Data")]
  public int DataId { get; set; }
  public virtual Data Data { get; set; }
}

推荐答案

它将无法正常工作.如果您进行一些调试，则会看到您将这样的内容发布到服务器:

It wont work. If you debug a little then you will see that you post to server something like this:

globalList:[object Object]
globalList:[object Object]
globalList:[object Object]

它只是字符串数组.但是有一种方法可以做您想要的.您可以将数组序列化为json，然后在控制器中反序列化.只需将参数更改为:

It is just array of strings. But there is a way to do what you want. You can serialize your array to json and then deserialize it in your controller. Just change your param to:

var parms = {
    globalList: JSON.stringify(globalList),
    fieldName: fieldName
};

动作:

[HttpPost]
public void SaveField(string globalList, string fieldName)
{
    var serializer = new JavaScriptSerializer(); //use any serializer you want
    var list = serializer.Deserialize<List<Point>>(globalList);
}

或者您可以通过HTML形式使param对象看起来像

Or you can make param object looks like from HTML form:

var parms = {
     "globalList[0].GeoDuzina": 51.506760996586294, 
     "globalList[0].GeoSirina": -0.06106463202740998,
     "globalList[1].GeoDuzina": 51.516269286402846, 
     "globalList[1].GeoSirina": -0.056258113472722464,
     "globalList[2].GeoDuzina": 51.50419662363912, 
     "globalList[2].GeoSirina": -0.044413478462956846,
     fieldName: fieldName
 };

它与您的操作配合使用.

It works with your action.

还有许多其他方法可以做到这一点.我只给他们看两个.对你有好处吗?

There are many other ways to do that. I just show two of them. Is any good for you?

顺便说一句.这个数字对于浮点数来说太长了.;)

btw. This numbers are too long for floats.;)

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