#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 =


        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));




About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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