HttpControllerDescriptor封装了某个HttpController类型的元数据，我们可以将它视为某个HttpController类型的描述对象。HttpActionDescriptor也类似。上一篇中说到Abp将ApiControler与Action信息分别封装于DynamicApiControllerInfo，DynamicApiActionInfo。Abp种HttpControllerDescriptor与HttpActionDescriptor有新的实现DynamicHttpControllerDescriptor，DyanamicHttpActionDescriptor。
Action的执行
Action方法的执行最终实现在HttpActionDescriptor的ExecuteAsync方法中。DyanamicHttpActionDescriptor也重写了ExecuteAsync，并且将Action的返回值类型定义为AjaxResponse。
public override Type ReturnType
{
get
{
return typeof(AjaxResponse);
}
}
public override System.Threading.Tasks.Task<object> ExecuteAsync(HttpControllerContext controllerContext, System.Collections.Generic.IDictionary<string, object> arguments, System.Threading.CancellationToken cancellationToken)
{
return base
.ExecuteAsync(controllerContext, arguments, cancellationToken)
.ContinueWith(task =>
{
try
{
if (task.Result == null)
{
return new AjaxResponse();
}
if (task.Result is AjaxResponse)
{
return task.Result;
}
return new AjaxResponse(task.Result);
}
catch (AggregateException ex)
{
ex.InnerException.ReThrow();
throw; // The previous line will throw, but we need this to makes compiler happy
}
});
}