ASP.NET5 MVC6 的模型绑定问题

我尝试将一些 JSON 数据以角度形式发布到我的 ASP.NET5 MVC6 控制器操作。模型绑定器似乎不起作用。不知道我在这里缺少什么。

我的 ASP 控制器：

public class DefaultController : Controller
{
    public IActionResult Index()
    {
        return View();
    }

    [HttpPost]
    public IActionResult SubmitTest(QTestViewModel model)
    {
        return Json("true");
    }
}

我的角度控制器：

angular.module("testActiveMq", [])
.controller("MqTestController", ["$scope", "$http", function ($scope, $http) {
    // Submit Form
    $scope.submitForm = function () {
        debugger;
        var formData = (this.data) ? angular.toJson(this.data) : null;
        if (formData && this.qForm && this.qForm.$valid) {
            $http({
                url: "/Default/SubmitTest",
                data: formData,
                method: "POST",
                dataType: "json",
                contentType: "application/json; charset=utf-8"
            })
            .then(function successCallback(response) {
                debugger;
                // this callback will be called asynchronously
                // when the response is available
            }, function errorCallback(response) {
                debugger;
                // called asynchronously if an error occurs
                // or server returns response with an error status.
            });
        }
    };
}])

我的视图模型：

public class QTestViewModel
{
    public string MqBrokerUri { get; set; }

    public string ClientId { get; set; }

    public string UserName { get; set; }

    public string Password { get; set; }

    public int TotalRequests { get; set; }

    public int MaxConcurrentRequests { get; set; }

    public int DelayBetweenThreads { get; set; }
}

当我发出请求时，HTTP 标头是..

POST /Default/SubmitTest HTTP/1.1
Host: localhost:50877
Connection: keep-alive
Content-Length: 225
Accept: application/json, text/plain, */*
Origin: http://localhost:50877
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.86 Safari/537.36
Content-Type: application/json;charset=UTF-8
Referer: http://localhost:50877/
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.8

我的表单数据看起来像这样..

{"MqBrokerUri":"ssl://broker-uri:1616?transport.acceptInvalidBrokerCert=true","ClientId":"MqLoadTest","UserName":"myunm","Password":"mypwd","TotalRequests":100,"MaxConcurrentRequests":10,"DelayBetweenThreads":1}

我觉得我错过了一些非常明显的东西。为什么我的 JSON 数据没有绑定到我的模型？我当然不需要自定义模型绑定器来完成如此简单的事情吗？

在 MVC 5 及更早版本中，您的代码足以在控制器中接收模型。 然而在 MVC 6 中你还需要设置[FromBody]控制器操作中的参数：

[HttpPost]
public IActionResult SubmitTest([FromBody]QTestViewModel model)
{
    return Json("true");
}

不确定为什么这是 MVC 6 中的要求，但如果您不添加 FromBody 属性，您的模型将保留其默认值。

• 例如检查Web API 教程 https://docs.asp.net/projects/mvc/en/latest/getting-started/first-web-api.html在官方文档中。

• 经过一番深入研究源头后，似乎BodyModelBinder https://github.com/aspnet/Mvc/blob/e2c267604214a00e36b5e4d7754dd6f248960502/src/Microsoft.AspNet.Mvc.Core/ModelBinding/BodyModelBinder.cs#L48将只接受专门启用的模型body绑定源，这是通过添加[FromBody] https://github.com/aspnet/Mvc/blob/eef6c3883a7e27b8387b0925f0b6a88df0a484c5/src/Microsoft.AspNet.Mvc.Core/FromBodyAttribute.cs属性。

  var allowedBindingSource = bindingContext.BindingSource;
  if (allowedBindingSource == null ||
      !allowedBindingSource.CanAcceptDataFrom(BindingSource.Body))
  {
      // Formatters are opt-in. This model either didn't specify [FromBody] or specified something
      // incompatible so let other binders run.
      return ModelBindingResult.NoResultAsync;
  }
  

附言。 Angular 默认情况下会字符串化 json 对象，但如果你使用 jQuery 之类的东西，你还需要手动调用JSON.stringify.