张贴到MVC控制器，视图模型保持空 [英] Posting to MVC Controller, ViewModel stays null

问题描述

我有这样的ASP.NET MVC控制器动作和视图模型：

I have this ASP.NET MVC controller action and viewmodel:

public JsonResult Upload(UploadModel MyModel)
{
    //do stuff with MyModel
}

public class UploadModel
{
    public string Name;
}

而在角，提交一个表单，这个动作的方法：

And in Angular, a method for submitting a form to this action:

function onSubmit() {
     console.log(vm.model);
     $http.post('/Home/Upload', vm.model).
     then(function (response) 
     { 
         // do stuff with response 
     }); 
};

当我登录vm.model，它看起来像这样：

When I log vm.model, it looks like this:

{ Name : "Some cool name" }

它看起来在请求负载完全相同。但是，当我张贴此对象上传方法，名称显示为空值。然而，当我改变上传方法，接受只是一个字符串，而不是一个视图模型：

It looks exactly the same in the request payload. But when I post this object to the Upload method, Name appears to be null. However, when I change the Upload method to accept just a string instead of a viewmodel:

public JsonResult Upload(String Name)
{
    //do stuff with Name
}

和发布完全相同的对象给它，它确实得到认可。

And post the exact same object to it, it does get recognized.

这是怎么回事？为什么不承认MVC我JS对象作为视图模型？

What is going on? Why isn't MVC recognizing my JS object as a viewmodel?

推荐答案

名称是一个领域，不是一个属性（没有的getter / setter），使 DefaultModelBinder 不能设置的值。将其更改为

Name is a field, not a property (no getter/setter) so the DefaultModelBinder cannot set the value. Change it to

public class UploadModel
{
    public string Name { get; set; }
}

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