#731 – Getting Information About the Members of a Class

You can use the Type.GetMembers method to get information about all public members in a type.  GetMembers returns an array of MemberInfo objects, each of which can be used to get details about one of the members of the type.

Here’s a sampling of some of the information that you can get:

            MemberInfo[] members = typeof(Dog).GetMembers();

            if (members != null)
                foreach (MemberInfo mi in members)
                {
                    Console.WriteLine(mi.Name);
                    Console.WriteLine(string.Format("  MemberType: {0}", mi.MemberType));

                    object[] attributes = mi.GetCustomAttributes(false);
                    if ((attributes != null) && (attributes.Length > 0))
                    {
                        Console.Write("  Attributes: ");
                        foreach (object attr in attributes)
                            Console.Write(string.Format("{0} ", attr.ToString()));
                        Console.WriteLine();
                    }

                    // Get subtype-specific information
                    switch (mi.MemberType)
                    {
                        case MemberTypes.Constructor:
                            DumpConstructorInfo((ConstructorInfo)mi);
                            break;

                        case MemberTypes.Event:
                            DumpEventInfo((EventInfo)mi);
                            break;

                        case MemberTypes.Method:
                            DumpMethodInfo((MethodInfo)mi);
                            break;
                    }

                    Console.WriteLine();
                }
        private static void DumpConstructorInfo(ConstructorInfo ci)
        {
            Console.WriteLine(string.Format("  Calling Convention: {0}", ci.CallingConvention));

            StringBuilder sbInfo = new StringBuilder("  ");
            if (ci.IsAbstract) sbInfo.Append("Abstract ");
            if (ci.IsGenericMethod) sbInfo.Append("GenericMethod ");
            if (ci.IsHideBySig) sbInfo.Append("HideBySig ");
            if (ci.IsPrivate) sbInfo.Append("Private ");
            if (ci.IsPublic) sbInfo.Append("Public ");
            if (ci.IsStatic) sbInfo.Append("Static ");
            if (ci.IsVirtual) sbInfo.Append("Virtual ");

            if (sbInfo.Length > 2)
                Console.WriteLine(sbInfo);
        }

        private static void DumpEventInfo(EventInfo ei)
        {
            Console.WriteLine(string.Format("  Event Handler Type: {0}", ei.EventHandlerType.Name));
            if (ei.IsMulticast) Console.WriteLine("  IsMulticast");
        }

        private static void DumpMethodInfo(MethodInfo mi)
        {
            Console.WriteLine(string.Format("  Calling Convention: {0}", mi.CallingConvention));

            StringBuilder sbInfo = new StringBuilder("  ");
            if (mi.IsAbstract) sbInfo.Append("Abstract ");
            if (mi.IsGenericMethod) sbInfo.Append("GenericMethod ");
            if (mi.IsHideBySig) sbInfo.Append("HideBySig ");
            if (mi.IsPrivate) sbInfo.Append("Private ");
            if (mi.IsPublic) sbInfo.Append("Public ");
            if (mi.IsStatic) sbInfo.Append("Static ");
            if (mi.IsVirtual) sbInfo.Append("Virtual ");

            ParameterInfo[] paraminfo = mi.GetParameters();
            if ((paraminfo != null) && (paraminfo.Length > 0))
            {
                Console.Write("  Parameters: ");
                foreach (ParameterInfo pi in paraminfo)
                {
                    Console.Write(string.Format("{0} ({1})  ", pi.Name, pi.ParameterType.Name));
                }
                Console.WriteLine();
            }
        }

731-001

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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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