Source generator runs too early in blazor projects

[stefanloerwald]

Source generators seem to not see correct content of classes when code is written in .razor files. I suspect they run "too early" in the build process.

Version Used:

Generator using <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.8.0-3.final" PrivateAssets="all" />, compiled with RC1.

Steps to Reproduce:

1. Generate a file Foo.razor with content @code { [Parameter] public object Value {get;set;} }
2. Write a source generator / analyzer that processes Foo's properties with the Parameter attribute, e.g.

var parameters = class_symbol
   .GetMembers()
   .Where(m => m.Kind == SymbolKind.Property)
   .Cast<IPropertySymbol>()
   .Where(ps => !ps.IsReadOnly)
   .Where(ps => ps.GetAttributes().Any(a => a.AttributeClass.Name == "Parameter"))
   .ToList();

3. Notice that the list of parameters comes back empty.

[stefanloerwald]

Sample repo: https://github.com/stefanloerwald/Generators.BetterBlazor

File Index.razor references component Component1.razor. On start of that project, you can observe that there is an exception thrown because of the incorrectly generated code (as the source generator doesn't see the full class code). Or you simply inspect the generated code with [F12]

[stefanloerwald]

Turns out I had a bug in the analyzer which wasn't caught in the unit tests. Sorry about this!