How Can I Get a List of All Classes Within a C# Assembly?

Obtaining a List of Classes in an Assembly Using C#

In C#, the ability to introspect and retrieve metadata about an assembly allows developers to access information about the types contained within it. One common task is to list all the classes in an assembly for various purposes such as documentation, analysis, or dynamic loading.

Solution: Assembly.GetTypes

The System.Reflection namespace provides the Assembly.GetTypes method, which returns an array of Type objects representing all the types defined in the assembly. Reflection is used to introspect assemblies and their contents.

Here's how you can use Assembly.GetTypes to list all classes in an assembly:

Assembly mscorlib = typeof(string).Assembly;
foreach (Type type in mscorlib.GetTypes())
{
    Console.WriteLine(type.FullName);
}

In this example, we use the Assembly.GetTypes method to obtain an array of types from the mscorlib assembly, which contains the core .NET Framework classes. By iterating through these types and checking their TypeKind property, we can filter out non-class types and display the full names of the class types.

This technique can be applied to any assembly to programmatically inspect and access information about the classes it contains.

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