How to Get All Classes from a Namespace in C#?

How to Retrieve All Classes Within a Namespace in C#

Enumerating all classes within a specified namespace is achievable in C# through a technique that examines all types within an assembly and filters them based on their namespaces. Here's the approach in detail:

using System.Reflection;

private Type[] GetTypesInNamespace(Assembly assembly, string nameSpace)
{
    return assembly.GetTypes()
                    .Where(t => String.Equals(t.Namespace, nameSpace, StringComparison.Ordinal))
                    .ToArray();
}

Sample Usage:

Type[] typelist = GetTypesInNamespace(Assembly.GetExecutingAssembly(), "MyNamespace");
for (int i = 0; i < typelist.Length; i++)
{
    Console.WriteLine(typelist[i].Name);
}

Prior to .Net 2.0, where Assembly.GetExecutingAssembly() is unavailable, an alternative approach involving typeof() is required to obtain the assembly:

Assembly myAssembly = typeof(<Namespace>.<someClass>).GetTypeInfo().Assembly;
Type[] typelist = GetTypesInNamespace(myAssembly, "<Namespace>");
for (int i = 0; i < typelist.Length; i++)
{
    Console.WriteLine(typelist[i].Name);
}

By utilizing these techniques, developers can effectively retrieve all classes residing within a specific namespace, enabling dynamic class enumeration in C# applications.

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