How Can I Programmatically List All Classes in a C# Assembly?

Enumerating Classes within an Assembly

To programmatically obtain a list of classes defined within an assembly, one can utilize C#'s capabilities for assembly reflection. This allows for introspection and examination of an assembly's metadata and its members, including classes.

Solution Using Assembly.GetTypes

The assembly's GetTypes method provides a straightforward approach to retrieve a collection of Type objects representing all the types defined within an assembly. For instance, to enumerate the classes in a specific assembly:

Assembly mscorlib = typeof(string).Assembly;
foreach (Type type in mscorlib.GetTypes())
{
    if (type.IsClass) // Filter for classes
    {
        Console.WriteLine(type.FullName);
    }
}

This code will iterate through the classes defined in the mscorlib assembly (which contains core functionality classes) and print their full names.

Further Considerations

The code above can be expanded to handle other types besides classes. For instance, to list all types (interfaces, enums, etc.):

foreach (Type type in mscorlib.GetTypes())
{
    Console.WriteLine($"{type.FullName} ({type.Namespace})");
}

Reflection allows for extensive introspection of assemblies and their members, facilitating various tasks such as object instantiation, type validation, and code generation.

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