asp.net-mvc - ASP.NET MVC 请求过滤器

Question

ASP.NET MVC 不支持某种 RequestFilters - 在 Controller 和 Action 实例化之前每个请求执行一次的过滤器吗？

Answer 1

您可以创建自己的路由处理程序，这可能在管道中足够早以实现您的目标。

public class MyRoutingHandler : IRouteHandler
{
    protected virtual IHttpHandler GetHttpHandler(RequestContext requestContext)
    {
        return new InterceptingMvcHandler(requestContext);
    }

    IHttpHandler IRouteHandler.GetHttpHandler(RequestContext requestContext)
    {
        return GetHttpHandler(requestContext);
    }

}

和相应的 mvc 处理程序:

public class InterceptingMvcHandler : MvcHandler
{
    public InterceptingMvcHandler(RequestContext requestContext) : base(requestContext)
    {
    }

    protected override IAsyncResult BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, object state)
    {
        httpContext.Response.Write("<h2>BeginProcessRequest</h2>");
        return base.BeginProcessRequest(httpContext, callback, state);
    }

    protected override void EndProcessRequest(IAsyncResult asyncResult)
    {
        var context = RequestContext.HttpContext;
        base.EndProcessRequest(asyncResult);
        if (context != null)
        {
            context.Response.Write("<h2>EndProcessRequest</h2>");
        }
    }
}

然后，您可以在路由注册中注册 mvc 处理程序。