Roslyn / IPropertySymbol / arrary return type - roslyn

Question

I'm trying to return all the properties of a class, and the return type of each property using Roslyn (not reflection..)
I've gotten close, but then I hit a property that returns an array of strings (or perhaps an enumeration?) I'm fighting with how to find out the type within the array/collection...
public class msgClass // part of a larger class, and referenced as Roslyn Document
string[] Lines {get; set;} //property in larger class of properties
...
var DocumentsInProject = await roslynUtilities.GetMembers<BasePropertyDeclarationSyntax>(msgClass);
foreach (var itemClassProperty in DocumentsInProject)
{
var itemDeclaredSymbol = semanticModelOfDoc
.GetDeclaredSymbol(itemClassProperty) as IPropertySymbol;
if (itemDeclaredSymbol == null)
throw new Exception($"property: {itemClassProperty}");
var name = itemDeclaredSymbol.Name;
//what does it return?
string returnType = string.Empty;
if (itemDeclaredSymbol.Type.IsReferenceType)
{
var typeofKind = itemDeclaredSymbol.Type.TypeKind;
var typeincollection = itemDeclaredSymbol.Type.BaseType;
var containingType = itemDeclaredSymbol.Type.ContainingType.Name;
}
else
{
returnType = itemDeclaredSymbol.Type.Name;
}
}
If it isn't obvious this is isn't production code - I'm hacking as I'm new to Roslyn, and I'm working on building a Visual Studio add-in that is reviewing classes in a project.

Answer 1

You actually need to convert property type symbol to INamedTypeSymbol or to IArrayTypeSymbol. You can check that the type is generic [un]bound type by INamedTypeSymbol and try to figure out the generic type parameters. It will allow to you receive collection's element type if type not just generic type, but collection. Casting to IArrayTypeSymbol will allow to you get array's element type. So your code should look like this:
...
if (itemDeclaredSymbol.Type is INamedTypeSymbol namedType && namedType.IsGenericType)
{
// use namedType.TypeArguments if type is bound generic or namedType.TypeParameters if isn't
}
else if (itemDeclaredSymbol.Type is IArrayTypeSymbol arrayType)
{
// use arrayType.ElementType as you want
}
...