通过Filter来支持;分别有IResourceFilter AuthorizeFilter ActionFilter ExceptionFilter ResultFilter,Filter也被称为拦截器。
那么 ASP.NET Core Filter如何支持依赖注入?可以通过全局注册,支持依赖注入。通过TypeFilter(typeof(Filter)) 标记在方法,标记在控制器。通过ServiceType(typeof(Filter))标记在方法,标记在控制器,必须要注册Filter这类;TypeFilter和ServiceType的本质是实现了一个IFilterFactory接口;
代码如下:
public class HomeController : Controller
{
private readonly ILoggerFactory _loggerFactory;
// 堆代码 duidaima.com
public HomeController(ILoggerFactory factory)
{
_loggerFactory = factory;
}
//[TestActionFilter]
// [TypeFilter(typeof(TestActionFilterAttribute))]
// [ServiceFilter(typeof(TestActionFilterAttribute))]
public IActionResult Index()
{
return View();
}
public IActionResult Privacy()
{
return View();
}
public class TestActionFilterAttribute : Attribute, IActionFilter
{
private readonly ILogger _logger;
public TestActionFilterAttribute(ILoggerFactory logger)
{
_logger = logger.CreateLogger("TestActionFilterAttribute");
}
public void OnActionExecuted(ActionExecutedContext context)
{
_logger.LogDebug($"11111");
if (context.HttpContext.Request.Query.TryGetValue("id", out StringValues value))
{
Console.WriteLine(value.First());
}
else
{
context.HttpContext.Response.Redirect("/Error/404");
}
}
public void OnActionExecuting(ActionExecutingContext context)
{ }
}