Question

如何在一个自定义OWIN中间件中检索api控制器名称和api操作名称？我可以在消息处理程序中执行此操作：

var config = request.GetConfiguration();
var routeData = config.Routes.GetRouteData(request);
var controllerContext = new HttpControllerContext(config, routeData, request);
request.Properties[HttpPropertyKeys.HttpRouteDataKey] = routeData;
controllerContext.RouteData = routeData;
var controllerDescriptor = new
DefaultHttpControllerSelector(config).SelectController(request);
controllerContext.ControllerDescriptor = controllerDescriptor;
var actionMapping = new ApiControllerActionSelector().SelectAction(controllerContext);

//controller name
controllerDescriptor.ControllerName
//action name
actionMapping.ActionName

更新这是我目前的OWIN中间件。如何在此代码中获取controllerName和actionName？

using AppFunc = Func<IDictionary<string, object>, Task>;

public class LoggingMiddleware
{
    private readonly AppFunc _next;
    private static readonly ILog RequestApiLogger = LogManager.GetLogger("RequestApiPacketLogger");
    private static readonly ILog ResponseApiLogger = LogManager.GetLogger("ResponseApiPacketLogger");

    public LoggingMiddleware(AppFunc next)
    {
        _next = next;
    }

    public async Task Invoke(IDictionary<string, object> environment)
    {
        var correlationId = Guid.NewGuid();
        IOwinContext context = new OwinContext(environment);

        // Buffer the request (body is a string, we can use this to log the request later
        var requestBody = new StreamReader(context.Request.Body).ReadToEnd();
        var requestData = Encoding.UTF8.GetBytes(requestBody);
        context.Request.Body = new MemoryStream(requestData);

        // Buffer the response
        var responseBuffer = new MemoryStream();
        var responseStream = context.Response.Body;
        context.Response.Body = responseBuffer;

        // add the "http-tracking-id" response header so the user can correlate back to this entry
        var responseHeaders = (IDictionary<string, string[]>)environment["owin.ResponseHeaders"];
        responseHeaders["http-tracking-id"] = new[] { correlationId.ToString("d") };

        IDictionary<string, string[]> responseHeadersClone = new Dictionary<string, string[]>(responseHeaders);

        //invoke the next piece of middleware in the pipeline
        await _next.Invoke(environment);

        // rewind the request and response buffers and record their content
        responseBuffer.Seek(0, SeekOrigin.Begin);
        var reader = new StreamReader(responseBuffer);
        var responseBody = await reader.ReadToEndAsync();

        // log the request/response as long at it wasn't preflight
        if (context.Request.Method.ToUpper() != "OPTIONS")
        {
            RequestApiLogger.LogHttpRequestAsync(context, correlationId, requestBody);
            ResponseApiLogger.LogHttpResponseAsync(context, correlationId, responseBody, responseHeadersClone);
        }

        // You need to do this so that the response we buffered is flushed out to the client application.
        responseBuffer.Seek(0, SeekOrigin.Begin);
        await responseBuffer.CopyToAsync(responseStream);
    }
}

Answer 1

你真的不能。 OWIN中间件不了解Web Api。它只知道传递给它的环境。中间件的概念是它独立于托管和应用程序平台。

您没有提供您要完成的具体示例，因此可能有一种方法可以执行您要执行的操作。

更新以包含对上述声明的回复：

您可以撤消您要执行的操作。均田。使用GetOwinEnvironmentExtension方法在Web Api内的HttpRequest上可以使用OWIN环境。您可以使用控制器内部的控制器和方法的名称向字典添加环境变量，然后在web api完成后调用中间件时使用该变量。很多重复的代码，但它会工作。

在调用方法之前，可能有一种拦截方法的方法。查看来自@ mark-jones的this回答，可能会让您对此有所了解。

希望有所帮助。

Web Api 2在OWIN中间件中获取控制器和操作名称？

1 个答案: