区分GET方法中的ASP.NET Web API包含查询字符串 [英] Differentiating Get Method Containing Query String in ASP.NET WEB API

问题描述

我有一个ASP.NET网页API包含以下get方法：

I have a ASP.NET Web Api Containing following Get Methods:

[RoutePrefix("api/contact")]
public class ContactController : ApiController
{
    private ContactContext db = new ContactContext();

    public IEnumerable<Contact> Get()
    {
        return db.Contacts.AsEnumerable();
    }



    [Route("{id:int}")]
    public Contact Get(int id)
    {
        var result = db.Contacts.Find(id);
        if (result == null)
        {


            throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.NotFound));
        }
        return result;
    }

    public IEnumerable<Contact> GetContacts([FromUri]Filter filter)
    {
        return db.Contacts.Where(c => c.DepartmentId == filter.DepartmentId && c.City == filter.City).ToList();
    }
}

在功能公开的IEnumerable＆LT;联系与GT; GetContactsfilter（[FromUri]过滤器过滤器） DepartementId＆安培;城市在查询字符串

In function public IEnumerable<Contact> GetContactsfilter([FromUri]Filter filter) DepartementId & City are in Query String like

localhost:12345/api/Contact?DepartmentId=2&city=Mumbai

我的问题是我怎么加属性的路由查询，因为
目前，它不能get方法区分并返回错误

My Question is how do I add Attribute Routing for Query,because Currently it cannot differentiate between the Get Methods and is returning error

{"Message":"An error has occurred.","ExceptionMessage":"Multiple actions were found that match the request: \r\nSystem.Collections.Generic.IEnumerable`1[MyFirstWebApi.Models.Contact] Get() on type MyFirstWebApi.Controllers.ContactController\r\nSystem.Collections.Generic.IEnumerable`1[MyFirstWebApi.Models.Contact] GetContacts(MyFirstWebApi.Models.Filter) on type MyFirstWebApi.Controllers.ContactController","ExceptionType":"System.InvalidOperationException","StackTrace":" at System.Web.Http.Controllers.ApiControllerActionSelector.ActionSelectorCacheItem.SelectAction(HttpControllerContext controllerContext)\r\n at System.Web.Http.Controllers.ApiControllerActionSelector.SelectAction(HttpControllerContext controllerContext)\r\n at System.Web.Http.ApiController.ExecuteAsync(HttpControllerContext controllerContext, CancellationToken cancellationToken)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.d__0.MoveNext()"}

我尝试添加路由属性来获取包含方法 ID 但是，这并不奏效。

推荐答案

属性路由或常规路由不支持模板中的查询参数。相反，你可以修改你的控制器只是有如下两个动作：

Attribute routing or regular routing does not support query parameters in the templates. Instead you could modify your controller to just have two actions as below:

// Here if no DepartmentId or City are provided, then the 'filter' parameter would be null
[Route]
public IEnumerable<Contact> GetContacts([FromUri]Filter filter)

[Route("{id:int}")]
public Contact Get(int id)

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