.Net Core MVC中过滤器简介 - .NET

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.Net Core MVC中过滤器简介(二)

2019-09-30 16:48:51 【大中小】浏览:176次

{ string header = request.Headers["X-Requested-With"]; return "XMLHttpRequest".Equals(header); } } View Code

定义完ExceptionFilter，该怎么注册到全局呢？在Stratup.cs中ConfigureServer中，进行注册

services.AddMvc(o =>
{
    o.Filters.Add(typeof(CustomExceptionFilterAttribute));// 这里就是全局注册Filter

}).SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

Action 过滤器，包装了对单个Action方法的调用，可以将参数传递给Action并从中获得Action Result。继承IActionFilter

 /// <summary>
 /// Action的Filter`
 /// </summary>
 public class CustomActionFilterAttribute : Attribute, IActionFilter
 {
     private ILogger<CustomActionFilterAttribute> _logger = null;
     public CustomActionFilterAttribute(ILogger<CustomActionFilterAttribute> logger)
     {
         this._logger = logger;
     } 
     public void OnActionExecuted(ActionExecutedContext context)
     {
         //context.HttpContext.Response.WriteAsync("ActionFilter Executed!");
         Console.WriteLine("ActionFilter Executed!");
         //this._logger.LogDebug("ActionFilter Executed!");
     } 
     public void OnActionExecuting(ActionExecutingContext context)
     {
         //context.HttpContext.Response.WriteAsync("ActionFilter Executing!");
         Console.WriteLine("ActionFilter Executing!");
         //this._logger.LogDebug("ActionFilter Executing!");
     }
 }

在Startup.cs中ConfigureServices进行注册

 //允许使用ServiceFilter 标记特性
 services.AddScoped<CustomActionFilterAttribute>();

标记到Controller的ActionFilter

/// <summary>
/// 标记到Controller
/// </summary>
public class CustomControllerActionFilterAttribute : Attribute, IActionFilter
{
    private ILogger<CustomControllerActionFilterAttribute> _logger = null;
    public CustomControllerActionFilterAttribute(ILogger<CustomControllerActionFilterAttribute> logger)
    {
        this._logger = logger;
    }
    public void OnActionExecuted(ActionExecutedContext context)
    {
        //context.HttpContext.Response.WriteAsync("ActionFilter Executed!");
        Console.WriteLine("ActionFilter Executed!");
        //this._logger.LogDebug("ActionFilter Executed!");
    }
    public void OnActionExecuting(ActionExecutingContext context)
    {
        //context.HttpContext.Response.WriteAsync("ActionFilter Executing!");
        Console.WriteLine("ActionFilter Executing!");
        //this._logger.LogDebug("ActionFilter Executing!");
    }
}

 [TypeFilter(typeof(CustomControllerActionFilterAttribute),Order =-1)]
 public class ThirdController : Controller
 {
}

注册到全局的ActionFilter

public class CustomGlobalActionFilterAttribute : Attribute, IActionFilter
{
    private ILogger<CustomGlobalActionFilterAttribute> _logger = null;
    public CustomGlobalActionFilterAttribute(ILogger<CustomGlobalActionFilterAttribute> logger)
    {
        this._logger = logger;
    }
    public void OnActionExecuted(ActionExecutedContext context)
    {
        //context.HttpContext.Response.WriteAsync("ActionFilter Executed!");
        Console.WriteLine("ActionFilter Executed!");
        //this._logger.LogDebug("ActionFilter Executed!");
    }
    public void OnActionExecuting(ActionExecutingContext context

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