Check if a type is a abstract class or interface or just a base class

Question

I need a method that takes class name as a parameter and returns me if the type is an abstract class or interface or a base class or in generic the type of the data type that I pass as a parameter.

Sukesh Marla · Answer

Akkiraju N o for base class thing There is no easy method you have to loop. Hope It Helped. Please Check This is Currect Answer .

Akkiraju Ivaturi · Answer

Hey thanks Vulpes that is what I wanted to know there is no short cut for the same. Yes I was looking for classes which are base classes and sorry if I am not clear in my question.

Vulpes · Answer

I wasn't sure at first exactly what you meant by base class but as it sounded like you wanted the categories to be both mutually exclusive and exhaustive I just returned the non-abstract classes. If you're looking for classes which are base classes of some other class or classes in the same assembly then I don't think there is an easier way than to iterate through all the classes and check if they have a child class.

Akkiraju Ivaturi · Answer

Hi Vulpes Thanks for sending the code for checking it a type is interface or a abstract class or a base class. I know there is a direct method where you can find it it is an interface or abstract class. But in your code all the classes are shown as base classes in the output where as Class B is only the base class since ClassA is abstract first and so the code cannot check if it is a base class. Anyways I would like to mark only the base classes as base class otherwise just class. Sukesh Thanks to you to send me the code to check the same. Guys I believe we need to loop through all the classes to identify for each class if there are sub classes and then if it has then it is a base class as below: Here for each class you need to pass the class to the getclasses to check if it has child classes. I would like to hear from you if you have any easy method to accomplish the same public static List GetClasses(Type baseType) { var assemblies = Assembly.LoadFrom(@C:\TestDLL.dll); var alltype = assemblies.GetTypes(); return alltype.Where(type => type.IsSubclassOf(baseType)).ToList(); }

Sukesh Marla · Answer

abstract class MyClass { } . . . . class Program { public static void FindInformation(Type t) { if(t.IsInterface) { Console.WriteLine(I am interface); } else if(t.IsAbstract) { Console.WriteLine(I am Abstract); } if(t.IsGenericType) { Console.WriteLine(I am Generic 
And Generic paramters are); foreach(Type generc in t.GetGenericArguments()) { Console.WriteLine(generc.Name); } } } public static void Main() { Type t = typeof(MyClass ); FindInformation(t); Console.ReadKey(); } } Hope It Helped. Please Check This is Currect Answer .

Vulpes · Answer

First create a class library mydll3.dll from the code below: public interface IFace {} public abstract class ClassA {} public class ClassB : ClassA {} public class ClassC {} public class ClassD : ClassB {} public struct StructE : IFace {} public enum EnumG {} Now create a console app from the following code and place the dll in the executable's folder: using System; using System.Reflection; using System.Collections.Generic; enum Category { Interface AbstractClass BaseClass OtherType } class Test { static Assembly assembly; static void Main() { assembly = Assembly.LoadFrom(mydll3.dll); foreach(Type t in assembly.GetTypes()) { Console.WriteLine({0} = {1} t GetCategory(t.FullName)); } Console.ReadKey(); } static Category GetCategory(string typeName) { Type t = assembly.GetType(typeName); Category cat; if (t.IsInterface) cat = Category.Interface; else if (t.IsAbstract) cat = Category.AbstractClass; else if (t.IsClass) cat = Category.BaseClass; else cat = Category.OtherType; return cat; } } The output should be: IFace = Interface ClassA = AbstractClass ClassB = BaseClass ClassC = BaseClass ClassD = BaseClass StructE = OtherType EnumG = OtherType