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  2. Why is it that “No HTTP resource was found that matches the request URI” here?

Why is it that “No HTTP resource was found that matches the request URI” here?

由 时光总嘲笑我的痴心妄想 提交于 2019-11-28 19:06:15
Benoit74B

Your problems have nothing to do with POST/GET but only with how to specify parameters in RouteAttribute. To ensure this, I added support for both verbs in my samples.

Let's go back to two very simple working examples.

    [Route("api/deliveryitems/{anyString}")]
    [HttpGet, HttpPost]
    public HttpResponseMessage GetDeliveryItemsOne(string anyString)
    {
        return Request.CreateResponse<string>(HttpStatusCode.OK, anyString);
    }

And 

    [Route("api/deliveryitems")]
    [HttpGet, HttpPost]
    public HttpResponseMessage GetDeliveryItemsTwo(string anyString = "default")
    {
        return Request.CreateResponse<string>(HttpStatusCode.OK, anyString);
    }

The first sample says that the "anyString" is a path segment parameter (part of the URL).

First sample example URL is:

  • localhost:xxx/api/deliveryItems/dkjd;dslkf;dfk;kkklm;oeop
    • return "dkjd;dslkf;dfk;kkklm;oeop"

The second sample says that the "anyString" is a query string parameter (optional here since a default value has been provided, but you can make it non-optional by simply removing the default value).

Second sample examples URL are:

  • localhost:xxx/api/deliveryItems?anyString=dkjd;dslkf;dfk;kkklm;oeop
    • return "dkjd;dslkf;dfk;kkklm;oeop"
  • localhost:xxx/api/deliveryItems
    • returns "default"

Of course, you can make it even more complex like with this third sample :

    [Route("api/deliveryitems")]
    [HttpGet, HttpPost]
    public HttpResponseMessage GetDeliveryItemsThree(string anyString, string anotherString = "anotherDefault")
    {
        return Request.CreateResponse<string>(HttpStatusCode.OK, anyString + "||" + anotherString);
    }

Third sample examples URL are:

  • localhost:xxx/api/deliveryItems?anyString=dkjd;dslkf;dfk;kkklm;oeop
    • return "dkjd;dslkf;dfk;kkklm;oeop||anotherDefault"
  • localhost:xxx/api/deliveryItems
    • returns "No HTTP resource was found that matches the request URI ..." (parameter anyString is mandatory)
  • localhost:xxx/api/deliveryItems?anotherString=bluberb&anyString=dkjd;dslkf;dfk;kkklm;oeop
    • returns "dkjd;dslkf;dfk;kkklm;oeop||bluberb"
    • note that parameters have been reversed, does not matter, this is not possible with "URL-style" of first example

When should you use path segment or query parameters ? Some advices have already been given here : REST API Best practices: Where to put parameters?

Have you tried using the [FromUri] attribute when sending parameters over the query string.

Here is an example:

[HttpGet]
[Route("api/department/getndeptsfromid")]
public List<Department> GetNDepartmentsFromID([FromUri]int FirstId, [FromUri] int CountToFetch)
{
    return HHSService.GetNDepartmentsFromID(FirstId, CountToFetch);
}

Include this package at the top also, using System.Web.Http;

WebApiConfig.Register(GlobalConfiguration.Configuration); should be on top.

You need to map the unique route to specify your parameters as query elements. In RouteConfig.cs (or WebApiConfig.cs) add:

config.Routes.MapHttpRoute(
            name: "MyPagedQuery",
            routeTemplate:     "api/{controller}/{action}/{firstId}/{countToFetch}",
            defaults: new { action = "GetNDepartmentsFromID" }
        );

Try this mate, you can chuck it in the body like so...

    [HttpPost]
    [Route("~/API/ChangeTheNameIfNeeded")]
    public bool SampleCall([FromBody]JObject data)
    {
        var firstName = data["firstName"].ToString();
        var lastName= data["lastName"].ToString();
        var email = data["email"].ToString();
        var obj= data["toLastName"].ToObject<SomeObject>();

        return _someService.DoYourBiz(firstName, lastName, email, obj);
    }

If it is a GET service, then you need to use it with a GET method, not a POST method. Your problem is a type mismatch. A different example of type mismatch (to put severity into perspective) is trying to assign a string to an integer variable.

I had that problem, if you are calling your REST Methods from another Assembly you must be sure that all your references have the same version as your main project references, otherwise will never find your controllers.

Regards.

Please check the class you inherited. Whether it is simply Controller or APIController.

By mistake we might create a controller from MVC 5 controller. It should be from Web API Controller.

标签
c#
controller
postman
request-uri
http-post-vars
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