[.NET 5RC1] How do we stream the runtime assemblies?

[ivan-prodanov]

Previously I created an issue here. It seems the change was by design. How can we add the the core runtime assemblies to Roslyn if we want to compile simple C# code in Blazor?

Let me add some context.
Prior to .NET Core 3.1 the internet is full of examples how to accomplish this by using the Location property of each assembly in order to load them using MetadataReference.FromStream(...) method. Since going forward the Location property in .NET 5 in blazor apps is going to be null, how can we accomplish this?

Previously (.NET Core 3.1)

        var client = new HttpClient
        {
            BaseAddress = new Uri(navigationManager.BaseUri)
        };

        var references = new List<MetadataReference>();

        foreach (var reference in refs.Where(x => !x.IsDynamic && !string.IsNullOrWhiteSpace(x.Location)))
        { // .NET 3.1 enters here. .NET 5 RC1 never enters.
            var stream = await client.GetStreamAsync($"_framework/_bin/{reference.Location}");
            references.Add(MetadataReference.CreateFromStream(stream));
        }

        var currentSyntaxTree = Microsoft.CodeAnalysis.CSharp.CSharpSyntaxTree.ParseText("/*Some arbitrary C# code*/");
        var compilation = CSharpCompilation.Create("Project1", new[] { _currentSyntaxTree }, references, null);

This is my only blocker to upgrading to .NET 5.

[ivan-prodanov]

I'm very disappointed that the team is ignoring this for second time...