在 ASP.NET MVC 中将对象的 JSON 数组发布到控制器

Question

我正在尝试通过 JSON 将一组对象发布到我的控制器。发送单个对象时，MVC 模型绑定工作正常，但是当我尝试发送对象数组时，绑定完全失败，并且我在控制器操作中收到一个空对象。

首先，这是我正在使用的 ViewModel：

public class ForecastViewModel
    {
        public int RestaurantCode { get; set; }
        public System.DateTime FiscalDate { get; set; }
        public Nullable<decimal> ForecastSales { get; set; }
        public Nullable<decimal> ForecastFOHLabour { get; set; }
        public Nullable<decimal> ForecastFOHHours { get; set; }
        public Nullable<decimal> ForecastBOHLabour { get; set; }
        public Nullable<decimal> ForecastBOHHours { get; set; }
        public Nullable<decimal> ForecastFoodSales { get; set; }

        public ForecastViewModel() { }

        public ForecastViewModel(Forecast model){...}
    }

控制器动作：

    [HttpPost]
    public ActionResult Update(List<ForecastViewModel> model){...}

这是发送到我的控制器的原始 JSON：

[{"RestaurantCode":1002,"FiscalDate":"2/24/2014","ForecastSales":"111","ForecastFOHLabour":"111.11","ForecastFOHHours":"11","ForecastBOHLabour":"111.11","ForecastBOHHours":"11","ForecastFoodSales":"111.11","FOHPercent":"100.1","BOHPercent":"100.0"},{"RestaurantCode":1002,"FiscalDate":"2/25/2014","ForecastSales":"111","ForecastFOHLabour":"111.11","ForecastFOHHours":"11","ForecastBOHLabour":"111.11","ForecastBOHHours":"11","ForecastFoodSales":"111.11","FOHPercent":"100.1","BOHPercent":"100.0"},{"RestaurantCode":1002,"FiscalDate":"2/26/2014","ForecastSales":"111","ForecastFOHLabour":"111.11","ForecastFOHHours":"11","ForecastBOHLabour":"111.11","ForecastBOHHours":"11","ForecastFoodSales":"111.11","FOHPercent":"100.1","BOHPercent":"100.0"},{"RestaurantCode":1002,"FiscalDate":"2/27/2014","ForecastSales":"111","ForecastFOHLabour":"111.11","ForecastFOHHours":"11","ForecastBOHLabour":"111.11","ForecastBOHHours":"11","ForecastFoodSales":"111.11","FOHPercent":"100.1","BOHPercent":"100.0"},{"RestaurantCode":1002,"FiscalDate":"2/28/2014","ForecastSales":"111","ForecastFOHLabour":"111.11","ForecastFOHHours":"11","ForecastBOHLabour":"111.11","ForecastBOHHours":"11","ForecastFoodSales":"111.11","FOHPercent":"100.1","BOHPercent":"100.0"},{"RestaurantCode":1002,"FiscalDate":"2/29/2014","ForecastSales":"111","ForecastFOHLabour":"111.11","ForecastFOHHours":"11","ForecastBOHLabour":"111.11","ForecastBOHHours":"11","ForecastFoodSales":"111.11","FOHPercent":"100.1","BOHPercent":"100.0"},{"RestaurantCode":1002,"FiscalDate":"2/30/2014","ForecastSales":"111","ForecastFOHLabour":"111.11","ForecastFOHHours":"11","ForecastBOHLabour":"111.11","ForecastBOHHours":"11","ForecastFoodSales":"111.11","FOHPercent":"100.1","BOHPercent":"100.0"}] 

我回过头来修改代码，将 ForecastViewModel 的单个实例发送到我的控制器而不是数组，并且绑定工作得很好：

    [HttpPost]
    public ActionResult Update(ForecastViewModel model){...}

这是我发送控制器操作的 JSON：

{"RestaurantCode":1002,"FiscalDate":"2/24/2014","ForecastSales":"111","ForecastFOHLabour":"111.11","ForecastFOHHours":"11","ForecastBOHLabour":"111.11","ForecastBOHHours":"11","ForecastFoodSales":"111.11","FOHPercent":"100.1","BOHPercent":"100.0"}

如何修改我的代码以使绑定对对象数组起作用？

更新： 这是发送请求的javascript。我正在使用 knockout.js 将我的对象数组序列化为 JSON。

self.save = function () {
    var forecasts = ko.toJSON(self.forecasts);

    console.log(forecasts)

    $.ajax({
        type: "POST",
        url: "/Tools/Forecasts/Update/",
        dataType: "application/json",
        data: forecasts
    }).done(function(data){
        alert("complete!");
    });
};

Answer 1

"application/json" 不是$.ajax 中dataType 参数的有效值（无论如何，此参数用于配置应如何解析来自服务器的数据，它与数据发送到服务器）。

你需要设置的是contentType选项：

$.ajax({
    type: "POST",
    url: "/Tools/Forecasts/Update/",
    contentType: "application/json",
    data: forecasts
}).done(function(data){
    alert("complete!");
});