OutputCache on server

问题:

I define OutputCache attributes on top of my controller actions, so that the server can give the same response quickly to different users. Bu it caches the whole page. I mean the master page is also cached if I have cached an action that returns a View(). So the user account information on top of the master page gets shared by every user. I want to cache only the content page, not the master page, _Layout.cshtml. How can I exclude that?

Edit: The part where I'm having trouble is this:

@if(Request.IsAuthenticated) {
    <text>Hello <strong>@User.Identity.Name</strong>!</text>
    @: | 
    @Html.ActionLink("Index", "Index", "Account")
    @: |
    @Html.ActionLink("Logout", "Logout", "Account")
}
else
{
    @:|
   @Html.ActionLink("Login", "Login", "Account")
}

When I cache a controller action, the returned view also carries this userlogin part from the cache, so it gives wrong salutes to almost every user. How can I dynamically generate this part even if the page is cached?

回答1:

VaryByCustom is what you want.

Put this in your Global.asax:

public override string GetVaryByCustomString(HttpContext context, string custom)
{
    return "User".Equals(custom, StringComparison.OrdinalIgnoreCase)
        ? User.Identity.Name
        : base.GetVaryByCustomString(context, custom);
}

...then use an [OutputCache(VaryByCustom = "User")] attribute.

This will still cause the whole page to be cached separately, but a separate cache will be created for each user.

If you are looking for other options, search for MVC donut caching or MVC donut hole caching.

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Sounds like you want donut hole caching. See if this answer helps you.