DataContract模型绑定到ASP.NET MVC操作方法参数中的JSON

Question

MVC3开箱即用JsonValueProviderFactory(),它非常方便将传入的JSON绑定到模型.不幸的是,我无法弄清楚如何设置名称与传入JSON不同的模型合同.例如:

[DataContract(Name = "session")]
public class FacebookSession
{
    [DataMember(Name = "access_token")]
    public string AccessToken { get; set; }

    [DataMember(Name = "expires")]
    public int? Expires { get; set; }

    [DataMember(Name = "secret")]
    public string Secret { get; set; }

    [DataMember(Name = "session_key")]
    public string Sessionkey { get; set; }

    [DataMember(Name = "sig")]
    public string Signature { get; set; }

    [DataMember(Name = "uid")]
    public string UserId { get; set; }
}

传入表示facebook会话的json对象时,属性secret和expires正确绑定,但其余部分没有,因为属性名称与json键名称不同.我希望datacontract序列化程序可以尝试绑定到属性中提供的名称,但似乎并非如此.有没有人有任何解决方法的建议？

编辑

我将如何使用此模型的示例:

    public ActionResult Log(int? custId, FacebookSession response)
    {       
          ViewBag.Id = response.UserId;                         
          return View();
    }

Answer 1

我最终使用gt124的链接模型绑定器示例以及更好的模型绑定器来编写我自己的模型绑定逻辑.最终看起来像这样:

public interface IFilteredModelBinder : IModelBinder
    {
        bool IsMatch(Type modelType);
    }

public class SmartModelBinder : DefaultModelBinder
{
    private readonly IFilteredModelBinder[] _filteredModelBinders;

    public SmartModelBinder(IFilteredModelBinder[] filteredModelBinders)
    {
        _filteredModelBinders = filteredModelBinders;
    }

    public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        foreach (var filteredModelBinder in _filteredModelBinders)
        {
            if (filteredModelBinder.IsMatch(bindingContext.ModelType))
            {
                return filteredModelBinder.BindModel(controllerContext, bindingContext);
            }
        }

        return base.BindModel(controllerContext, bindingContext);
    }
}

public class NewtonsoftJsonModelBinder : IFilteredModelBinder
{
    public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        if (!controllerContext.HttpContext.Request.ContentType.StartsWith("application/json", StringComparison.OrdinalIgnoreCase))
        {
            // not JSON request
            return null;
        }

        var request = controllerContext.HttpContext.Request;
        request.InputStream.Position = 0;
        var incomingData = new StreamReader(request.InputStream).ReadToEnd();

        if (String.IsNullOrEmpty(incomingData))
        {
            // no JSON data
            return null;
        }
        object ret = JsonConvert.DeserializeObject(incomingData, bindingContext.ModelType); 
        return ret;
    }

    public bool IsMatch(Type modelType)
    {
        var ret = (typeof(JsonModel).IsAssignableFrom(modelType));
        return ret;
    }
}

然后我使用JSON.net属性映射到模型上的不同对象属性(而不是DataContracts).这些模型都继承自空基类JsonModel.