Asp.net 在没有 [服务筛选器] 或 [类型筛选器] 的筛选器中注入核心依赖项

Question

我需要将一些具有依赖关系注入的服务注入到操作过滤器中。我熟悉[ServiceFilter]和[TypeFilter]的方法，但它有点丑陋，混乱和不清楚。

有没有办法以正常方式设置过滤器？ 无需包装我正在使用的过滤器[ServiceFilter]或[TypeFilter]？

例如我想要的：

[SomeFilterWithDI]
[AnotherFilterWithDI("some value")]
public IActionResult Index()
{
return View("Index");
}

而不是：

[ServiceFilter(typeof(SomeFilterWithDI))]
[TypeFilter(typeof(AnotherFilterWithDI), Arguments = new string[] { "some value" })]
public IActionResult Index()
{
return View("Index");
}

它看起来很不同，这种方法对我来说似乎不对。

Answer 1

对于[SomeFilterWithDI]，你可以参考@Kirk larkin的评论。

对于[AnotherFilterWithDI("some value")]，您可以尝试从TypeFilterAttribute传递Arguments。

• ParameterTypeFilter定义接受参数。

  public class ParameterTypeFilter: TypeFilterAttribute
  {
  public ParameterTypeFilter(string para1, string para2):base(typeof(ParameterActionFilter))
  {
  Arguments = new object[] { para1, para2 };
  }
  }
  

• ParameterActionFilter接受传递的参数。

  public class ParameterActionFilter : IActionFilter
  {
  private readonly ILogger _logger;
  private readonly string _para1;
  private readonly string _para2;
  public ParameterActionFilter(ILoggerFactory loggerFactory, string para1, string para2)
  {
  _logger = loggerFactory.CreateLogger<ParameterTypeFilter>();
  _para1 = para1;
  _para2 = para2;
  }
  public void OnActionExecuting(ActionExecutingContext context)
  {
  _logger.LogInformation($"Parameter One is {_para1}");
  // perform some business logic work
  }
  public void OnActionExecuted(ActionExecutedContext context)
  {
  // perform some business logic work
  _logger.LogInformation($"Parameter Two is {_para2}");
  }
  }
  

  正如Arguments的描述，ILoggerFactory loggerFactory由dependency injection container解决。para1和para2由ParameterTypeFilter解决。

  //
  // Summary:
  //     Gets or sets the non-service arguments to pass to the Microsoft.AspNetCore.Mvc.TypeFilterAttribute.ImplementationType
  //     constructor.
  //
  // Remarks:
  //     Service arguments are found in the dependency injection container i.e. this filter
  //     supports constructor injection in addition to passing the given Microsoft.AspNetCore.Mvc.TypeFilterAttribute.Arguments.
  public object[] Arguments { get; set; }
  

• 用途

  [ParameterTypeFilter("T1","T2")]
  public ActionResult Parameter()
  {
  return Ok("Test");
  }