将以逗号分隔的列表绑定到List< int>.在ASP.NET Web API中 [英] Binding a comma separated list to a List<int> in asp.net web api

问题描述

Web api expecst中的默认活页夹

The default binder in web api expecst

http://url.com/webapi/Report/?PageIds= 3243& PageIds = 2365

绑定到

public IHttpActionResult Report(List<int> PageIds){ // exciting webapi code}

我希望绑定 http://url.com/webapi/Report/?PageIds=3243,2365

由于我的URL空间不足，无法执行GET.

as I am running out of space in my URL to do a GET.

我创建了一个课程 公共类CommaSeparatedModelBinder:

I have created a class public class CommaSeparatedModelBinder :

System.Web.Http.ModelBinding.IModelBinder
    {
        public bool BindModel(HttpActionContext actionContext, ModelBindingContext bindingContext)
        {
           //Binding in here
        }
     }

并将其注册到我的WebApiConfig.cs

 var provider = new SimpleModelBinderProvider(
           typeof(List<int>), new CommaSeparatedModelBinder());
            config.Services.Insert(typeof(ModelBinderProvider), 0, provider);

我已经更改了方法签名以使用模型绑定器

I have altered my method signature to use the model binder like so

 public IHttpActionResult Report( [ModelBinder] List<int> PageIds){ // exciting webapi code}

但是我的活页夹中的断点没有被击中(并且列表没有被绑定).

However a break point in my binder is not being hit (and the list does not get bound).

我还需要配置什么?

推荐答案

请确保遵循本文的所有步骤所有:

Make sure to follow all of the steps in this article: Parameter Binding in ASP.NET Web API

您似乎错过了最后一步:

It appears you are missing the last step:

对于模型绑定提供程序，您仍然需要向参数添加[ModelBinder]属性，以告知Web API它应该使用模型绑定程序而不是媒体类型格式化程序.但是现在您无需在属性中指定模型联编程序的类型:

With a model-binding provider, you still need to add the [ModelBinder] attribute to the parameter, to tell Web API that it should use a model binder and not a media-type formatter. But now you don’t need to specify the type of model binder in the attribute:

   public HttpResponseMessage Get([ModelBinder] GeoPoint location) { ... }

此外，我从未尝试绑定到List<int>.您可能无法对绑定模型化，因为它是内置类型.如果是这样，只需将其与自定义类类型一起包装，并确保将[ModelBinder]属性添加到该类中即可.

Also, I've never tried binding to List<int>. You may not be able to model bind to it because it is a build-in type. If so, just box it with a custom class type and make sure to add the [ModelBinder] attribute to the class.

OR ....

更好的解决方案:吻

public IHttpActionResult Report(string PageIds)
{
     var ids = PageIds.Split(',');
     // exciting web api code and/or more robust checking of the split
}

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