我正在尝试添加Microsoft 扩展依赖注入 https://www.nuget.org/packages/Microsoft.Extensions.DependencyInjection/到现有的 ASP.NET WebApi/Owin 项目。
下列的这篇博文 https://scottdorman.github.io/2016/03/17/integrating-asp.net-core-dependency-injection-in-mvc-4/，我添加了ConfigureServices功能，已实现DependencyResolver，并做了HttpConfiguration实例来使用它。
此外，我将所有非抽象控制器添加到 DI 中，并确保使用 DI 机制实例化它们。
但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
找不到方法：“System.Net.Http.HttpRequestMessage System.Web.Http.Controllers.HttpActionContext.get_Request()”。
即使我只是添加，我也会得到相同的结果Microsoft.Extensions.DependencyInjection打包到 NuGet 并且不要更改任何其他代码。我删除它后，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);
}
}
将控制器添加到 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()
