我有一个 webforms 项目,但正在使用 WebAPI 来提供 Web 服务。我正在尝试实施 Autofac。我正进入(状态:
'MyController' does not have a default constructor
根据 Autofac 文档,我的配置是正确的,但显然存在问题。我正在使用 Visual Studio 2010/.Net 4。这是我的 Application_Start
private void Application_Start(object sender, EventArgs e)
{
//This enables api controllers in a separate class library
GlobalConfiguration.Configuration.Services.Replace(typeof(IAssembliesResolver), new AssembliesResolver());
GlobalConfiguration.Configuration.IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Always;
//Elmah for webapi
GlobalConfiguration.Configuration.Filters.Add(new ElmahHandleErrorApiAttribute());
var json = GlobalConfiguration.Configuration.Formatters.JsonFormatter;
json.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.Objects;
GlobalConfiguration.Configuration.Formatters.Remove(GlobalConfiguration.Configuration.Formatters.XmlFormatter);
var builder = new ContainerBuilder();
//Register DbContext
builder.RegisterType<MyDbContext>()
.As<IMyDbContext>()
.InstancePerRequest();
//Register service layer
var businessLayer = Assembly.GetExecutingAssembly();
builder.RegisterAssemblyTypes(AppDomain.CurrentDomain.GetAssemblies())
.Where(t => t.Name.EndsWith("Service"))
.AsImplementedInterfaces();
builder.RegisterApiControllers(Assembly.GetExecutingAssembly());
builder.RegisterWebApiFilterProvider(GlobalConfiguration.Configuration);
var container = builder.Build();
_containerProvider = new ContainerProvider(container);
var webApiResolver = new AutofacWebApiDependencyResolver(container);
GlobalConfiguration.Configuration.DependencyResolver = webApiResolver;
}
典型的 api 控制器如下所示:
[Authorize]
public class MyController : ApiController
{
public IMyService context { get; set; }
public MyController(IMyService context)
{
this.context = context;
}
// GET api/dostuff
/// <summary>
/// Get a list of all dtos
/// </summary>
/// <returns></returns>
public IEnumerable<MyDto> Get()
{
try
{
return context.MyDtos.ToList();
}
catch (Exception ex)
{
var message = string.Format("{0} {1} HTTP/1.1 {2} Exception: {3}", Request.Method, Request.RequestUri, HttpStatusCode.MethodNotAllowed, ex.Message);
var errorMessage = new System.Web.Http.HttpError(message) { { "ErrorCode", 405 } };
throw new HttpResponseException(ControllerContext.Request.CreateErrorResponse(HttpStatusCode.MethodNotAllowed, errorMessage));
}
}
}
如果你的 api 控制器与你的 web 项目位于不同的程序集中,那么你需要告诉 Autofac 在哪里可以使用 changning 找到你的控制器:
builder.RegisterApiControllers(Assembly.GetExecutingAssembly());
To
builder.RegisterApiControllers(typeof(MyController).Assembly);
这将指示 Autofac 扫描程序集MyController
and 全部注册 ApiController
派生类型它在那里找到的东西。
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