How to return a specific status code and no contents from Controller?

问题

I want the example controller below to return a status code 418 with no contents. Setting the status code is easy enough but then it seems like there is something that needs to be done to signal the end of the request. In MVC prior to ASP.NET Core or in WebForms that might be a call to Response.End() but how does it work in ASP.NET Core where Response.End does not exist?

public class ExampleController : Controller
{
    [HttpGet][Route("/example/main")]
    public IActionResult Main()
    {
        this.HttpContext.Response.StatusCode = 418; // I'm a teapot
        // How to end the request?
        // I don't actually want to return a view but perhaps the next
        // line is required anyway?
        return View();   
    }
}

回答1:

this.HttpContext.Response.StatusCode = 418; // I'm a teapot

How to end the request?

Try other solution, just:

return StatusCode(418);

You could use StatusCode(???) to return any HTTP status code.

Also, you can use dedicated results:

Success:

return Ok() ← Http status code 200
return Created() ← Http status code 201
return NoContent(); ← Http status code 204

Client Error:

return BadRequest(); ← Http status code 400
return Unauthorized(); ← Http status code 401
return NotFound(); ← Http status code 404

More details:

ControllerBase Class (Thanks @Technetium)
StatusCodes.cs (consts aviable in ASP.NET Core)
HTTP Status Codes on Wiki
HTTP Status Codes IANA

回答2:

If anyone wants to do this with a IHttpActionResult may be in a Web API project, Below might be helpful.

// GET: api/Default/
public IHttpActionResult Get()
{
    //return Ok();//200
    //return StatusCode(HttpStatusCode.Accepted);//202
    //return BadRequest();//400
    //return InternalServerError();//500
    //return Unauthorized();//401
    return Ok();
}

回答3:

This code might work for non-.NET Core MVC controllers:

this.HttpContext.Response.StatusCode = 418; // I'm a teapot
return Json(new { status = "mer" }, JsonRequestBehavior.AllowGet);

回答4:

Look at how the current Object Results are created. Here is the BadRequestObjectResult. Just an extension of the ObjectResult with a value and StatusCode.

https://github.com/aspnet/Mvc/blob/master/src/Microsoft.AspNetCore.Mvc.Core/BadRequestObjectResult.cs

I created a TimeoutExceptionObjectResult just the same way for 408.

/// <summary>
/// An <see cref="ObjectResult"/> that when executed will produce a Request Timeout (408) response.
/// </summary>
[DefaultStatusCode(DefaultStatusCode)]
public class TimeoutExceptionObjectResult : ObjectResult
{
    private const int DefaultStatusCode = StatusCodes.Status408RequestTimeout;

    /// <summary>
    /// Creates a new <see cref="TimeoutExceptionObjectResult"/> instance.
    /// </summary>
    /// <param name="error">Contains the errors to be returned to the client.</param>
    public TimeoutExceptionObjectResult(object error)
        : base(error)
    {
        StatusCode = DefaultStatusCode;
    }
}

Client:

if (ex is TimeoutException)
{
    return new TimeoutExceptionObjectResult("The request timed out.");
}

来源：https://stackoverflow.com/questions/37690114/how-to-return-a-specific-status-code-and-no-contents-from-controller

标签

asp.net-core

asp.net-core-mvc

asp.net-core-webapi