Microsoft.AspNet.Mvc
Microsoft.AspNet.Mvc.Core
Microsoft.AspNet.Mvc.ModelBinding
Microsoft.AspNet.Mvc.Razor
Microsoft.AspNet.Mvc.Razor.Host
Microsoft.AspNet.Mvc.TagHelpers
Microsoft.AspNet.Mvc.Xml
Microsoft.AspNet.PageExecutionInstrumentation.Interfaces

public interface IAssemblyProvider
{
 IEnumerable<Assembly> CandidateAssemblies { get; }
}

services.AddMvc().WithControllersAsServices(new[]
{
 typeof(MyController).Assembly,
 typeof(ExternalPocoController).Assembly
});

var col = this.Resolver.GetRequiredService<ILibraryManager>();
var data = col.GetReferencingLibraries("Microsoft.AspNet.Mvc");

protected virtual IEnumerable<ILibraryInformation> GetCandidateLibraries()
{
 if (ReferenceAssemblies == null)
 {
  return Enumerable.Empty<ILibraryInformation>();
 }

 // GetReferencingLibraries returns the transitive closure of referencing assemblies
 // for a given assembly.
 return ReferenceAssemblies.SelectMany(_libraryManager.GetReferencingLibraries)
        .Distinct()
        .Where(IsCandidateLibrary);
}

public interface IControllerTypeProvider
{
 IEnumerable<TypeInfo> ControllerTypes { get; }
}

protected internal virtual bool IsController([NotNull] TypeInfo typeInfo,
            [NotNull] ISet<Assembly> candidateAssemblies)
{
 if (!typeInfo.IsClass) // 该类型必须是一个类
 {
  return false;
 }
 if (typeInfo.IsAbstract) // 该类必须不是抽象类
 {
  return false;
 }
 // We only consider public top-level classes as controllers. IsPublic returns false for nested
 // classes, regardless of visibility modifiers
 if (!typeInfo.IsPublic) // 该类必须是一个Public类（并且不嵌套），嵌套类不能作为Controller
 {
  return false;
 }
 if (typeInfo.ContainsGenericParameters) // 该类不能是泛型类
 {
  return false;
 }
 if (!typeInfo.Name.EndsWith(ControllerTypeName, StringComparison.OrdinalIgnoreCase) &&
  !DerivesFromController(typeInfo, candidateAssemblies)) // 该类以Controller结尾，或继承于Controller基类，或其父类也是Controller。
 {
  return false;
 }
 if (typeInfo.IsDefined(typeof(NonControllerAttribute))) // 该类不能设置NonControllerAttribute特性
 {
  return false;
 }

 return true;
}

services.AddMvc().WithControllersAsServices(new[]
 {
  typeof(MyController),
  typeof(ExternalPocoController)
 });

public Task<ActionDescriptor> SelectAsync([NotNull] RouteContext context)
{
 // ...
}

public IEnumerable<ActionModel> BuildActionModels([NotNull] TypeInfo typeInfo,
             [NotNull] MethodInfo methodInfo)
{
 if (!IsAction(typeInfo, methodInfo))
 {
  return Enumerable.Empty<ActionModel>();
 }
 // ....省略其它代码
}

protected virtual bool IsAction([NotNull] TypeInfo typeInfo, [NotNull] MethodInfo methodInfo)
{
 // The SpecialName bit is set to flag members that are treated in a special way by some compilers
 // (such as property accessors and operator overloading methods).
 if (methodInfo.IsSpecialName) // 不能是特殊名称（如重载的操作符或属性访问器）
 {
  return false;
 }

 if (methodInfo.IsDefined(typeof(NonActionAttribute))) // 不能声明NonActionAttribute特性
 {
  return false;
 }

 // Overriden methods from Object class, e.g. Equals(Object), GetHashCode(), etc., are not valid.
 if (methodInfo.GetBaseDefinition().DeclaringType == typeof(object)) //不能是重载的方法，比如Equals和GetHashCode
 {
  return false;
 }

 // Dispose method implemented from IDisposable is not valid
 if (IsIDisposableMethod(methodInfo, typeInfo)) // 不能是Dispose方法
 {
  return false;
 }

 if (methodInfo.IsStatic) // 不能是静态方法
 {
  return false;
 }

 if (methodInfo.IsAbstract) // 不能是抽象方法
 {
  return false;
 }

 if (methodInfo.IsConstructor) // 不能是构造函数
 {
  return false;
 }

 if (methodInfo.IsGenericMethod) // 不能是泛型方法
 {
  return false;
 }

 return
  methodInfo.IsPublic; // 必须是Public方法
}