在 .NET Core 中从 HttpResponseMessage 转换为 IActionResult答案

【问题标题】：Convert from HttpResponseMessage to IActionResult in .NET Core在 .NET Core 中从 HttpResponseMessage 转换为 IActionResult
【发布时间】：2019-01-09 12:26:17
【问题描述】：

我正在将一些以前用 .NET Framework 编写的代码移植到 .NET Core。

我有这样的事情：

HttpResponseMessage result = await client.SendAync(request);
if (result.StatusCode != HttpStatusCode.OK)
{
    IHttpActionResult response = ResponseMessage(result);
    return response;
}

这个函数的返回值现在是IActionResult。

如何获取HttpResponseMessage result 对象并从中返回IActionResult？

【问题讨论】：

你运行的是 .NET Core 2.1 吗？
在不知道 ResponseMessage 做什么的情况下，我们如何为您提供帮助？
@FedericoDipuma ResponseMessage 来自将HttpResponseMessage 转换为IHttpActionResult 的Asp.Net Web API 2 ApiController。 OP 正在将以前的代码移植到当前版本。
@FedericoDipuma ResponseMessage 是System.Web.Http 库的一个函数部分。它只是从您指定的HttpResponseMessage 创建一个ResponseMessageResult。
完全不记得那个方法了。感谢您的澄清@Nkosi

标签： c# .net asp.net-core

【解决方案1】：

您可以使用诸如Ok(); 或BadRequest(); 之类的硬设置状态代码返回

或者使用动态返回使用

StatusCode(<Your status code number>,<Optional return object>);

这是using Microsoft.AspNetCore.Mvc

下面是 this.StatusCode 的详细说明：

/* "this" comes from your class being a subclass of Microsoft.AspNetCore.Mvc.ControllerBase */
StatusCodeResult scr = this.StatusCode(200);
/* OR */
Object myObject = new Object();
ObjectResult ores = this.StatusCode(200, myObject);
return scr; /* or return ores;*/

【讨论】：

您可以添加完全限定名称吗？还是“使用”声明？谢谢。
@granadaCoder 确定

【解决方案2】：

您应该能够使用Microsoft.AspNetCore.Mvc.WebApiCompatShim nuget 包将现有代码迁移到 ASP.NET Core 2.x。

那么你可以这样做：

return new ResponseMessageResult(result);

或者，作为替代方案，您可以从 ApiController 继承您的 Controller 并保留您的代码：

public class MyController : ApiController 
{
    public IActionResult Get()
    {
        // other code...
        HttpResponseMessage result = await client.SendAync(request);
        if (result.StatusCode != HttpStatusCode.OK)
        {
            IActionResult response = ResponseMessage(result);
            return response;
        }
        // other code...
    }    
}

更多信息在official documentation内

【讨论】：

ApiController 在 .Net Core 中可用吗？我认为在 .Net 核心中它只是一个 Controller 基类？
@LP13 如答案所述，ApiController 是您在使用 Microsoft.AspNetCore.Mvc.WebApiCompatShim nuget 包时获得的兼容性类。
此响应中缺少的是您必须通过在服务器Startup 类的ConfigureServices 函数中调用services.AddMvc().AddWebApiConventions(); 来启用WebApi 兼容层。（否则，服务器只会尝试将 ResponseMessage 对象序列化为 JSON。）
剃须刀页面可以吗？

【解决方案3】：

感谢大家的回答。我走了一条略有不同的路线。我想那段代码的重点是，如果SendAsync 以任何方式失败，我想返回该错误消息。因此，我将其更改为：

if (result.StatusCode != HttpStatusCode.OK)
{
    return BadRequest(result.ReasonPhrase);
}

【讨论】：

您应该编写一个错误处理中间件，它会自动为您完成。

【解决方案4】：

对于.NET v5 (erstwhile .NET Core v5) ControllerBase DLL 中的ControllerBase 类包含大量方法，这些方法返回从IActionResult 继承的对象。 IActionResult 是 HttpResponseMessage 的替代品。我移植了一个用于返回文件的 .NET Framework Web API 方法：

[HttpGet]
public IHttpActionResult GetFooBar()
{
    var fileContentByteArray = foodBarDomainService.GetExeByteArray();
    var result = new HttpResponseMessage(HttpStatusCode.OK)
    {
        Content = new ByteArrayContent(fileContentByteArray)
    };
    result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
    {
        FileName = "FooBar.exe"
    };
    result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
    return ResponseMessage(result);
}

这是我移植到 .NET Core 的代码：

[HttpGet("GetFooBar", Name = "GetFooBar")]
public IActionResult GetFooBar(string token)
{
    var fileContentByteArray = foodBarDomainService.GetExeByteArray();
    return File(fileContentByteArray, "application/octet-stream", "FooBar.exe");
}

这里是返回实现IActionResult接口的各种类以满足各种需求的所有方法的完整列表：

public virtual AcceptedResult Accepted(Uri uri, [ActionResultObjectValue] object value);
public virtual AcceptedResult Accepted(string uri, [ActionResultObjectValue] object value);
public virtual AcceptedResult Accepted(Uri uri);
public virtual AcceptedResult Accepted([ActionResultObjectValue] object value);
public virtual AcceptedResult Accepted();
public virtual AcceptedResult Accepted(string uri);
public virtual AcceptedAtActionResult AcceptedAtAction(string actionName, string controllerName, object routeValues, [ActionResultObjectValue] object value);
public virtual AcceptedAtActionResult AcceptedAtAction(string actionName, object routeValues, [ActionResultObjectValue] object value);
public virtual AcceptedAtActionResult AcceptedAtAction(string actionName);
public virtual AcceptedAtActionResult AcceptedAtAction(string actionName, string controllerName);
public virtual AcceptedAtActionResult AcceptedAtAction(string actionName, [ActionResultObjectValue] object value);
public virtual AcceptedAtActionResult AcceptedAtAction(string actionName, string controllerName, [ActionResultObjectValue] object routeValues);
public virtual AcceptedAtRouteResult AcceptedAtRoute(string routeName);
public virtual AcceptedAtRouteResult AcceptedAtRoute(object routeValues, [ActionResultObjectValue] object value);
public virtual AcceptedAtRouteResult AcceptedAtRoute(string routeName, object routeValues, [ActionResultObjectValue] object value);
public virtual AcceptedAtRouteResult AcceptedAtRoute(string routeName, object routeValues);
public virtual AcceptedAtRouteResult AcceptedAtRoute([ActionResultObjectValue] object routeValues);
public virtual BadRequestResult BadRequest();
public virtual BadRequestObjectResult BadRequest([ActionResultObjectValue] object error);
public virtual BadRequestObjectResult BadRequest([ActionResultObjectValue] ModelStateDictionary modelState);
public virtual ChallengeResult Challenge(params string[] authenticationSchemes);
public virtual ChallengeResult Challenge();
public virtual ChallengeResult Challenge(AuthenticationProperties properties);
public virtual ChallengeResult Challenge(AuthenticationProperties properties, params string[] authenticationSchemes);
public virtual ConflictResult Conflict();
public virtual ConflictObjectResult Conflict([ActionResultObjectValue] object error);
public virtual ConflictObjectResult Conflict([ActionResultObjectValue] ModelStateDictionary modelState);
public virtual ContentResult Content(string content);
public virtual ContentResult Content(string content, MediaTypeHeaderValue contentType);
public virtual ContentResult Content(string content, string contentType, Encoding contentEncoding);
public virtual ContentResult Content(string content, string contentType);
public virtual CreatedResult Created(Uri uri, [ActionResultObjectValue] object value);
public virtual CreatedResult Created(string uri, [ActionResultObjectValue] object value);
public virtual CreatedAtActionResult CreatedAtAction(string actionName, string controllerName, object routeValues, [ActionResultObjectValue] object value);
public virtual CreatedAtActionResult CreatedAtAction(string actionName, object routeValues, [ActionResultObjectValue] object value);
public virtual CreatedAtActionResult CreatedAtAction(string actionName, [ActionResultObjectValue] object value);
public virtual CreatedAtRouteResult CreatedAtRoute(object routeValues, [ActionResultObjectValue] object value);
public virtual CreatedAtRouteResult CreatedAtRoute(string routeName, object routeValues, [ActionResultObjectValue] object value);
public virtual CreatedAtRouteResult CreatedAtRoute(string routeName, [ActionResultObjectValue] object value);
public virtual FileStreamResult File(Stream fileStream, string contentType, string fileDownloadName);
public virtual VirtualFileResult File(string virtualPath, string contentType, string fileDownloadName, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag, bool enableRangeProcessing);
public virtual VirtualFileResult File(string virtualPath, string contentType, string fileDownloadName, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag);
public virtual VirtualFileResult File(string virtualPath, string contentType, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag, bool enableRangeProcessing);
public virtual VirtualFileResult File(string virtualPath, string contentType, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag);
public virtual VirtualFileResult File(string virtualPath, string contentType, string fileDownloadName, bool enableRangeProcessing);
public virtual VirtualFileResult File(string virtualPath, string contentType, string fileDownloadName);
public virtual VirtualFileResult File(string virtualPath, string contentType, bool enableRangeProcessing);
public virtual VirtualFileResult File(string virtualPath, string contentType);
public virtual FileStreamResult File(Stream fileStream, string contentType, string fileDownloadName, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag, bool enableRangeProcessing);
public virtual FileStreamResult File(Stream fileStream, string contentType, string fileDownloadName, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag);
public virtual FileStreamResult File(Stream fileStream, string contentType, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag, bool enableRangeProcessing);
public virtual FileStreamResult File(Stream fileStream, string contentType, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag);
public virtual FileStreamResult File(Stream fileStream, string contentType, string fileDownloadName, bool enableRangeProcessing);
public virtual FileStreamResult File(Stream fileStream, string contentType);
public virtual FileContentResult File(byte[] fileContents, string contentType, string fileDownloadName, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag, bool enableRangeProcessing);
public virtual FileContentResult File(byte[] fileContents, string contentType, string fileDownloadName, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag);
public virtual FileContentResult File(byte[] fileContents, string contentType, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag, bool enableRangeProcessing);
public virtual FileContentResult File(byte[] fileContents, string contentType, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag);
public virtual FileContentResult File(byte[] fileContents, string contentType, string fileDownloadName, bool enableRangeProcessing);
public virtual FileContentResult File(byte[] fileContents, string contentType, string fileDownloadName);
public virtual FileContentResult File(byte[] fileContents, string contentType, bool enableRangeProcessing);
public virtual FileContentResult File(byte[] fileContents, string contentType);
public virtual FileStreamResult File(Stream fileStream, string contentType, bool enableRangeProcessing);
public virtual ForbidResult Forbid(params string[] authenticationSchemes);
public virtual ForbidResult Forbid();
public virtual ForbidResult Forbid(AuthenticationProperties properties, params string[] authenticationSchemes);
public virtual ForbidResult Forbid(AuthenticationProperties properties);
public virtual LocalRedirectResult LocalRedirect(string localUrl);
public virtual LocalRedirectResult LocalRedirectPermanent(string localUrl);
public virtual LocalRedirectResult LocalRedirectPermanentPreserveMethod(string localUrl);
public virtual LocalRedirectResult LocalRedirectPreserveMethod(string localUrl);
public virtual NoContentResult NoContent();
public virtual NotFoundObjectResult NotFound([ActionResultObjectValue] object value);
public virtual NotFoundResult NotFound();
public virtual OkResult Ok();
public virtual OkObjectResult Ok([ActionResultObjectValue] object value);
public virtual PhysicalFileResult PhysicalFile(string physicalPath, string contentType, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag);
public virtual PhysicalFileResult PhysicalFile(string physicalPath, string contentType, string fileDownloadName, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag, bool enableRangeProcessing);
public virtual PhysicalFileResult PhysicalFile(string physicalPath, string contentType, string fileDownloadName, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag);
public virtual PhysicalFileResult PhysicalFile(string physicalPath, string contentType, DateTimeOffset? lastModified, EntityTagHeaderValue entityTag, bool enableRangeProcessing);
public virtual PhysicalFileResult PhysicalFile(string physicalPath, string contentType, string fileDownloadName, bool enableRangeProcessing);
public virtual PhysicalFileResult PhysicalFile(string physicalPath, string contentType, string fileDownloadName);
public virtual PhysicalFileResult PhysicalFile(string physicalPath, string contentType, bool enableRangeProcessing);
public virtual PhysicalFileResult PhysicalFile(string physicalPath, string contentType);
public virtual ObjectResult Problem(string detail = null, string instance = null, int? statusCode = null, string title = null, string type = null);
public virtual RedirectResult Redirect(string url);
public virtual RedirectResult RedirectPermanent(string url);
public virtual RedirectResult RedirectPermanentPreserveMethod(string url);
public virtual RedirectResult RedirectPreserveMethod(string url);
public virtual RedirectToActionResult RedirectToAction(string actionName, string controllerName, string fragment);
public virtual RedirectToActionResult RedirectToAction(string actionName, string controllerName, object routeValues);
public virtual RedirectToActionResult RedirectToAction(string actionName, string controllerName, object routeValues, string fragment);
public virtual RedirectToActionResult RedirectToAction(string actionName);
public virtual RedirectToActionResult RedirectToAction(string actionName, object routeValues);
public virtual RedirectToActionResult RedirectToAction();
public virtual RedirectToActionResult RedirectToAction(string actionName, string controllerName);
public virtual RedirectToActionResult RedirectToActionPermanent(string actionName, string controllerName, object routeValues, string fragment);
public virtual RedirectToActionResult RedirectToActionPermanent(string actionName, string controllerName, object routeValues);
public virtual RedirectToActionResult RedirectToActionPermanent(string actionName, string controllerName, string fragment);
public virtual RedirectToActionResult RedirectToActionPermanent(string actionName, string controllerName);
public virtual RedirectToActionResult RedirectToActionPermanent(string actionName, object routeValues);
public virtual RedirectToActionResult RedirectToActionPermanent(string actionName);
public virtual RedirectToActionResult RedirectToActionPermanentPreserveMethod(string actionName = null, string controllerName = null, object routeValues = null, string fragment = null);
public virtual RedirectToActionResult RedirectToActionPreserveMethod(string actionName = null, string controllerName = null, object routeValues = null, string fragment = null);
public virtual RedirectToPageResult RedirectToPage(string pageName);
public virtual RedirectToPageResult RedirectToPage(string pageName, string pageHandler, object routeValues, string fragment);
public virtual RedirectToPageResult RedirectToPage(string pageName, string pageHandler, string fragment);
public virtual RedirectToPageResult RedirectToPage(string pageName, string pageHandler, object routeValues);
public virtual RedirectToPageResult RedirectToPage(string pageName, string pageHandler);
public virtual RedirectToPageResult RedirectToPage(string pageName, object routeValues);
public virtual RedirectToPageResult RedirectToPagePermanent(string pageName, string pageHandler, string fragment);
public virtual RedirectToPageResult RedirectToPagePermanent(string pageName);
public virtual RedirectToPageResult RedirectToPagePermanent(string pageName, object routeValues);
public virtual RedirectToPageResult RedirectToPagePermanent(string pageName, string pageHandler);
public virtual RedirectToPageResult RedirectToPagePermanent(string pageName, string pageHandler, object routeValues, string fragment);
public virtual RedirectToPageResult RedirectToPagePermanentPreserveMethod(string pageName, string pageHandler = null, object routeValues = null, string fragment = null);
public virtual RedirectToPageResult RedirectToPagePreserveMethod(string pageName, string pageHandler = null, object routeValues = null, string fragment = null);
public virtual RedirectToRouteResult RedirectToRoute(string routeName);
public virtual RedirectToRouteResult RedirectToRoute(string routeName, object routeValues);
public virtual RedirectToRouteResult RedirectToRoute(string routeName, string fragment);
public virtual RedirectToRouteResult RedirectToRoute(string routeName, object routeValues, string fragment);
public virtual RedirectToRouteResult RedirectToRoute(object routeValues);
public virtual RedirectToRouteResult RedirectToRoutePermanent(string routeName, string fragment);
public virtual RedirectToRouteResult RedirectToRoutePermanent(string routeName, object routeValues);
public virtual RedirectToRouteResult RedirectToRoutePermanent(string routeName, object routeValues, string fragment);
public virtual RedirectToRouteResult RedirectToRoutePermanent(string routeName);
public virtual RedirectToRouteResult RedirectToRoutePermanent(object routeValues);
public virtual RedirectToRouteResult RedirectToRoutePermanentPreserveMethod(string routeName = null, object routeValues = null, string fragment = null);
public virtual RedirectToRouteResult RedirectToRoutePreserveMethod(string routeName = null, object routeValues = null, string fragment = null);
public virtual SignInResult SignIn(ClaimsPrincipal principal, string authenticationScheme);
public virtual SignInResult SignIn(ClaimsPrincipal principal, AuthenticationProperties properties);
public virtual SignInResult SignIn(ClaimsPrincipal principal, AuthenticationProperties properties, string authenticationScheme);
public virtual SignInResult SignIn(ClaimsPrincipal principal);
public virtual SignOutResult SignOut();
public virtual SignOutResult SignOut(AuthenticationProperties properties);
public virtual SignOutResult SignOut(params string[] authenticationSchemes);
public virtual SignOutResult SignOut(AuthenticationProperties properties, params string[] authenticationSchemes);
public virtual StatusCodeResult StatusCode([ActionResultStatusCode] int statusCode);

【讨论】：