c# - 使用 Microsoft Asp.NET 依赖注入(inject)时找不到 HttpActionContext.get_Request() 方法

Question

我正在尝试添加 Microsoft Extensions Dependency Injection到现有的 ASP.NET WebApi/Owin 项目。

已关注 this blog post ，我添加了 ConfigureServices 函数，实现了 DependencyResolver，并创建了 HttpConfiguration 实例来使用它。

我还将所有非抽象 Controller 添加到 DI 中，并确保它们使用 DI 机制实例化。

但是在完成所有这些操作之后，对应用程序的请求会返回错误 500 并出现异常

Method not found: 'System.Net.Http.HttpRequestMessage System.Web.Http.Controllers.HttpActionContext.get_Request()'.

即使我只是将 Microsoft.Extensions.DependencyInjection 包添加到 NuGet 并且不更改任何其他代码，我也会得到相同的结果。删除后，一切正常。

这是我添加到 Startup.cs 中的代码:

DependcyResolver 实现:

public class DefaultDependencyResolver :
    System.Web.Http.Dependencies.IDependencyResolver, 
    System.Web.Http.Dependencies.IDependencyScope
{
    protected IServiceProvider serviceProvider;

    public DefaultDependencyResolver(IServiceProvider serviceProvider)
    {
        this.serviceProvider = serviceProvider;
    }

    public IDependencyScope BeginScope()
    {
        return this;
    }

    public void Dispose() { }

    public object GetService(Type serviceType)
    {
        return this.serviceProvider.GetService(serviceType);
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        return this.serviceProvider.GetServices(serviceType);
    }

}

将 Controller 添加到 DI:

public void ConfigureServices(IServiceCollection services)
{
    System.Diagnostics.Debugger.Launch();   
    IEnumerable<Type> controllers = typeof(Startup).Assembly.GetExportedTypes()
       .Where(t => !t.IsAbstract && !t.IsGenericTypeDefinition)
       .Where(t => typeof(IController).IsAssignableFrom(t)
          || t.Name.EndsWith("Controller", StringComparison.OrdinalIgnoreCase));

    foreach (var c in controllers)
    {
        services.AddTransient(c);
    }
}

创建ServiceCollection，调用服务配置并设置DependencyResolver:

public void Configuration(IAppBuilder app) {
    // ...
    HttpConfiguration httpConfiguration = new HttpConfiguration();

    var services = new ServiceCollection();
    ConfigureServices(services);

    httpConfiguration.DependencyResolver = 
        new DefaultDependencyResolver(services.BuildServiceProvider());

    WebApiConfig.Register(httpConfiguration);
    app.UseWebApi(httpConfiguration);
}

异常堆栈跟踪:

at myCompany.myProduct.Controllers.SomeController.Get(String id, String offline)
at lambda_method(Closure , Object , Object[] )
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n
System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()

Answer 1

您可能需要将绑定(bind)重定向添加到您的 web.config 文件中。检查以下链接以获取有关该问题的更多信息:

https://github.com/Microsoft/BotBuilder/issues/3615

https://github.com/dotnet/standard/issues/481

https://learn.microsoft.com/en-us/dotnet/framework/configure-apps/how-to-enable-and-disable-automatic-binding-redirection