ASP.Net Core 1.0 RTM – Serving Static Files

If you have been using ASP.Net Core pre RTM release then you might have been using the Microsoft.AspNetCore.StaticFiles dependency to serve up static content from your ASP.Net web application.

If you have been using the latest stable version of this dependency 1.0.0 then you may come across an issue when using the RTM release of ASP.Net Core.

With the RTM release and Update 3 for Visual Studio 2015 we now have a Program.cs with a Main() entry point to our application added to our project when we create a new web application.

public class Program
    public static void Main(string[] args)
        var host = new WebHostBuilder()


As you can see there is a .UseContentRoot extension method that gets called setting the content root of our application to the current directory.

To use static files we still need need to reference the Microsoft.AspNetCore.StaticFiles dependency but we must use the pre-release version 1.0.0-rc2-final or we will get the following error.

Error CS0121 The call is ambiguous between the following methods or properties: ‘Microsoft.AspNetCore.Hosting.WebHostBuilderExtensions.UseContentRoot(Microsoft.AspNetCore.Hosting.IWebHostBuilder, string)’ and ‘Microsoft.AspNetCore.Hosting.HostingAbstractionsWebHostBuilderExtensions.UseContentRoot(Microsoft.AspNetCore.Hosting.IWebHostBuilder, string)’

The reason is that the WebHostBuilderExtensions class that contains the UseContentRoot method has been moved to the Microsoft.AspNetCore.Hosting assembly and if you reference version 1.0.0 and not 1.0.0-rc2-final version of the Microsoft.AspNetCore.StaticFiles assembly then you will get an ambiguous reference between these namespaces.

To setup static file serving correctly with RTM just add a dependency to 1.0.0-rc2-final version of Microsoft.AspNetCore.StaticFiles and then add the following in your Startup.cs.

public void Configure(IApplicationBuilder app)

You can see the updated documentation for static files here:

Custom Tag Helpers with ASP.Net Core & MVC 6

I was playing around with the new tag helper functionality in MVC 6 and decided to put together a quick tutorial on how to create custom tag helpers for your own MVC 6 projects.

I was targeting the ASP.Net Core 1.0 framework in this video but it also applies to .Net 4.6 framework with MVC 6.

I was never really a fan of mixing markup and code within Razor views and I believe tag helpers are a much nicer way to separate out code a functionality in your web projects.