#727 – Get a List of All Namespaces in an Assembly

While you can’t explicitly get a list of all namespaces within a .NET assembly, you can iterate through all types in the assembly and build up a list of namespaces.

Below is some sample code that organizes all types in an assembly, by namespace.

        static void Main()
        {
            // Build list of all types :
            //   SortedList<namespace-name, SortedList<type-name, Type>>

            SortedList<string, SortedList<string, Type>> myTypeList =
                ExtractListOfTypes(Assembly.GetExecutingAssembly());

            DumpTypeList(myTypeList);
        }

        private static SortedList<string, SortedList<string, Type>> ExtractListOfTypes(Assembly assem)
        {
            SortedList<string, SortedList<string, Type>> theList =
                new SortedList<string, SortedList<string, Type>>();

            foreach (Type t in assem.GetTypes())
            {
                // Add namespace if it's not already in list
                if (!theList.ContainsKey(t.Namespace))
                    theList.Add(t.Namespace, new SortedList<string, Type>());

                // And add type under appropriate namespace
                theList[t.Namespace].Add(t.FullName, t);
            }

            return theList;
        }

        private static void DumpTypeList(SortedList<string, SortedList<string, Type>> theList)
        {
            foreach (KeyValuePair<string,SortedList<string,Type>> kvp in theList)
            {
                Console.WriteLine(string.Format("Namespace: [{0}]", kvp.Key));

                foreach (KeyValuePair<string, Type> kvpInner in kvp.Value)
                {
                    Console.WriteLine(string.Format("  Type: [{0}]", ((Type)kvpInner.Value).FullName));
                }

                Console.WriteLine();
            }
        }

#726 – Listing all Types within a Namespace

You can’t directly list out all types within a namespace.  But you can get all types within a particular assembly and then filter out only the types that match a particular namespace.

        static void Main()
        {
            // Dump all types from in a specified namespace
            DumpTypesForNamespace(Assembly.GetExecutingAssembly(), "ConsoleApplication1");
            DumpTypesForNamespace(Assembly.GetExecutingAssembly(), "ConsoleApplication1.Dog");

            int i = 1;
        }

        private static void DumpTypesForNamespace (Assembly assem, string theNamespace)
        {
            Console.WriteLine(string.Format("[{0}]", theNamespace));

            foreach (Type t in assem.GetTypes())
            {
                if (t.Namespace == theNamespace)
                {
                    string dump =
                        string.Format("{0}\n  ({1} in {2})\n", t.FullName, TypeIndicator(t), t.Namespace);

                    Console.WriteLine(dump);
                }
            }
            Console.WriteLine("\n");
        }

        private static string TypeIndicator(Type t)
        {
            string typeIndicator = "?";

            if ((t.BaseType != null) &&
                (t.BaseType.FullName == "System.MulticastDelegate"))
                typeIndicator = "delegate";

            else if (t.IsClass)
            {
                if (t.IsNested)
                    typeIndicator = "Nested class";
                else
                    typeIndicator = "class";
            }
            else if (t.IsInterface)
                typeIndicator = "interface";

            else if (t.IsValueType)
                typeIndicator = "struct";

            else if (t.IsEnum)
                typeIndicator = "enum";

            return typeIndicator;
        }