Why is my ASP.NET Action looking for the wrong View?

问题

I have a simple action:

    public ActionResult CommentError(string error)
    {
        return View(error);
    }

I have a simple partial view called CommentError.ascx:

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<String>" %>

<%: Model %>

When I browse to the view directy by going to myurl.com/find/Comments/CommentError the view displays fine... no errors.

But, when I go to myurl.com/find/Comments/CommentError?error=SomeErrorString, instead of binding the querystring to string error, it looks for a view called SomeErrorString.ascx.

Why is this happening?

Edit
Note, i do have a custom global.asax as indicated by the paths I'm using (/find/Comments/CommentError ::: /find/{controler}/{action})

回答1:

As mentioned, MVC is looking for a view named the same as the string parameter. To avoid this, you need to cast it to an object...

public ActionResult CommentError(string error)
{
    return View((object)error);
}

回答2:

You generally should avoid the Model object you pass to the View() helper being of type string. This is the cause of your error.

MVC is looking for a View named what your string parameter is. Because that's what the best matching overload of View() is: the View(string) overload uses the string parameter as the name of the view to load.

You should encapsulate your Model data (the string) in a custom type, or pass that info via the ViewData collection instead.

回答3:

As an alternative answer (just for education) you could just invoke a different overload of View()

return View("CommentError", null, error);

来源：https://stackoverflow.com/questions/4522409/why-is-my-asp-net-action-looking-for-the-wrong-view