自定义模型绑定的复杂的复合对象帮助 [英] Custom Model Binder for Complex composite objects HELP

问题描述

我想写一个自定义的模型绑定，但我有很大的困难试图弄清楚如何绑定复杂的复合对象。

I am trying to write a custom model binder but I'm having great difficulty trying to figure how to bind complex composite objects.

这是我想要绑定到类：

public class Fund
{
        public int Id { get; set; }
        public string Name { get; set; }
        public List<FundAllocation> FundAllocations { get; set; }
}

这就是我在编写定制绑定尝试的样子：

and this is how my attempt at writing the custom binder looks like:

public class FundModelBinder : IModelBinder
{
    public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        throw new NotImplementedException();
    }

    public object GetValue(ControllerContext controllerContext, string modelName, Type modelType, ModelStateDictionary modelState)
    {
        var fund = new Fund();

        fund.Id = int.Parse(controllerContext.HttpContext.Request.Form["Id"]);
        fund.Name = controllerContext.HttpContext.Request.Form["Name"];

        //i don't know how to bind to the list property :(
        fund.FundItems[0].Catalogue.Id = controllerContext.HttpContext.Request.Form["FundItem.Catalogue.Id"];
        return fund;
    }
}

任何想法

谢谢
托尼

推荐答案

你真的需要在这里实现自定义ModelBinder的？默认的粘结剂可以做你的需要（因为它可以填充集合和复杂的对象）：

Do you really need to implement a custom ModelBinder here? The default binder may do what you need (as it can populate collections and complex objects):

比方说你的控制器动作看起来是这样的：

Lets say your controller action looks like this:

public ActionResult SomeAction(Fund fund)
{
  //do some stuff
  return View();
}

和你的HTML包含此：

And you html contains this:

<input type="text" name="fund.Id" value="1" />
<input type="text" name="fund.Name" value="SomeName" />

<input type="text" name="fund.FundAllocations.Index" value="0" />
<input type="text" name="fund.FundAllocations[0].SomeProperty" value="abc" />

<input type="text" name="fund.FundAllocations.Index" value="1" />
<input type="text" name="fund.FundAllocations[1].SomeProperty" value="xyz" />

默认的模型粘合剂应该与FundAllocations列表2项初始化你的基金的对象（我不知道你的FundAllocation类是什么样子，所以我做了一个单一的财产SomeProperty）。只是一定要包括那些fund.FundAllocations.Index元素（这默认粘结剂看它自己使用），这让我当我试图得到这个工作）。

The default model binder should initialise your fund object with 2 items in the FundAllocations List (I don't know what your FundAllocation class looks like, so I made up a single property "SomeProperty"). Just be sure to include those "fund.FundAllocations.Index" elements (which the default binder looks at for it's own use), that got me when I tried to get this working).

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