securing a string method - controller

I return "~/Error/Unauthorized" page if a user is not admin and tries to access certain controllers. Here is how I return the error page:

            if (!Models.Authorization.AdminPageCheck(this.User))
            return 开发者_如何学编程new RedirectResult("~/Error/Unauthorized");

I am able to do it for ActionResult methods, but not for string methods as it doesn't return a view. How can I secure a string method?

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It's preferable to use ASP.NET MVC's built-in capability, and just annotate your Controller (either at the class level, for all actions, or at the action method level) with

[Authorize]

In the event that someone tries to call a method and they are not logged in, they'll be forced to authenticate using the method configured in web.config.

Or, if you use

[Authorize(Roles = "AdminRole")]

They'll be forced to authenticate, if they're not already, then they'll be granted or denied access based on them having the relevant role.

It's a very common requirement and thankfully, the ASP.NET MVC Team have dealt with it very comprehensively!

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You should change those methods to return ActionResults.
You can then return Content(someText, "content/type")

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If you sometimes have a different outcome than just a string, then the preferred "fix" there would be: don't return string; return ActionResult, and when it is the string,

return Content(yourString);

Optionally specifying a content-type / encoding.

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As SLaks mentioned, you can change the return type of the string methods to ActionResult, then use the ContentResult class to return a string.