为什么不调用GetVaryByCustomString

Question

使用下面的代码在ASP.NET MVC2中实现输出缓存.

GetVaryByCustomString不调用方法:将断点放在第一行,运行应用程序显示未到达断点.达到控制器Index()中的断点.

如何VaryByCustom 在ASP.NET MVC2中使用？

控制器:

        [OutputCache(VaryByCustom = "user")]
        public ActionResult Index(string _entity, string id)
        {
...

的Global.asax.cs:

public class MvcApplication : System.Web.HttpApplication
{
    public  override string GetVaryByCustomString(HttpContext context, string arg)
    {
        if (arg == "user")
        {
            HttpCookie cookie = context.Request.Cookies["Company"];
            if (cookie != null)
                return Thread.CurrentPrincipal.Identity.Name + "," + cookie.Value;
            return Thread.CurrentPrincipal.Identity.Name;
        }
        return base.GetVaryByCustomString(context, arg);
    }

}

Answer 1

您的OutputCache定义是错误的.您必须指定Duration:

[OutputCache(VaryByCustom = "user", Duration = 50)]
public ActionResult Index(string _entity, string id)

现在GetVaryByCustomString将调用您重写的方法.另外不要忘记GetVaryByCustomString只有在控制器操作完成执行后才会调用该方法.