Using own diagnostics in a command line program

Question

I'm writing a command line program witch is intended to open a solution and scan the documents for errors and warnings. I'm using the following code:

private static async void testDocument(Document document)
{
    var syntaxTree = await document.GetSyntaxTreeAsync();
    var semanticModel = await document.GetSemanticModelAsync();

    var diagnostics = syntaxTree.GetDiagnostics().Concat(semanticModel.GetDiagnostics());
    foreach (var diagnostic in diagnostics)
    {
        Console.WriteLine(diagnostic.ToString());
    }
}

This works fine, but I also want to output warnings detected from diagnostics written by myself. These are located in another project created with the "Diagnostic with Code Fix" template. How can I put these two things together?

Answer 1

When you create your Workspace , call the overload that takes a HostServices , and pass your own host that contains the default assebmlies as well as your own assemblies:

MSBuildWorkspace.Create(
    ImmutableDictionary<string, string>.Empty,
    MefHostServices.Create(
        MefHostServices.DefaultAssemblies.Add(Assembly.Load(...))
    )
);

Answer 2

One option is to use the Roslyn CSharp Compiler from Command Line. You can pass the /analyzer switch with your own diagnostics dll.