How Can I Customize View Locations in ASP.NET MVC to Find Views in Non-Standard Folders?

Finding views in non-standard folders: ASP.NET MVC view location customization

ASP.NET MVC searches for views at specific locations in the file system by default. However, customizing these search locations can be useful when projects are organized in a non-standard way. This article explores how to specify custom view positions.

Problem Overview

Suppose the project structure is as follows: the controller is located at /Controllers/Demo and the view is located at /Views/Demo. The following controller code may cause an error:

public class DemoArea1Controller : Controller
{
    public ActionResult Index()
    {
        return View();
    }
}

The default search location does not include the /Views/Demo folder, so an error will be reported, indicating that the view "Index" cannot be found.

Solution

To specify a custom view position, you can extend the WebFormViewEngine class and modify the PartialViewLocationFormats and ViewLocationFormats attributes:

public class CustomViewEngine : WebFormViewEngine
{
    public CustomViewEngine()
    {
        var viewLocations = new[] {
            "~/Views/{1}/{0}.aspx",
            "~/Views/{1}/{0}.ascx",
            "~/Views/Shared/{0}.aspx",
            "~/Views/Shared/{0}.ascx",
            "~/Demo/Views/{1}/{0}.aspx",
            "~/Demo/Views/{1}/{0}.ascx"
        };

        this.PartialViewLocationFormats = viewLocations;
        this.ViewLocationFormats = viewLocations;
    }
}

This updated view engine includes /Demo/Views folders in search locations.

Configuration

Finally, register the custom view engine in the Global.asax.cs method of Application_Start:

protected void Application_Start()
{
    ViewEngines.Engines.Clear();
    ViewEngines.Engines.Add(new CustomViewEngine());
}

With these modifications, ASP.NET MVC will now search for views in default locations and custom /Demo/Views folders.

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