CODEWITHSUNDEEP
c#dll
SoptikHa
SoptikHa

Reputation: 467

Load class from DLL, instantiate it as another class children

I have class foo

public abstract class Foo
{
    protected int[,] bar;
    public abstract Point test(int a, int b);
}

And in program, I have another 4 classes inherited from foo.

class inheritedClass : Foo
{
// ...
}

And I want to load another class from DLL and add it to List<Foo>, where I store all classes that are inherited from Foo. How can I do it? Now, I have this:

try
{
     DLL = Assembly.LoadFile(name);
     Type type = DLL.GetType("DLL.customObject");
     var obj = Activator.CreateInstance(type);
     // Even when [obj] is not null, [newObj] is always null
     newObj = obj as Foo;
 }
 catch
 {
     return false;
 }

Here's my DLL

namespace DLL
{
    public class customObject : Foo
    {
         // ...
    }


    public abstract class Foo
    {
        protected int[,] bar;
        public abstract Point test(int a, int b);
    }
}

Upvotes: 0

Views: 324

Answers (2)

saidfagan
saidfagan

Reputation: 841

As I understand you want to make a class from DLL a sublcass of your custom class. It is not possible in C#. If you don't have access to the code of a class you can't change its inheritance hierarchy. Consider using List<object> to store your objects.

Upvotes: 1

Hameed Syed
Hameed Syed

Reputation: 4275

var assembly= Assembly.LoadFile(@"C:\myDll.dll");
// Assembly executingAssembly = assembly.GetExecutingAssembly();
    Type type = assembly.GetType("DLL.customObject");
    object obj = Activator.CreateInstance(type);

or

Type t = AppDomain.CurrentDomain.GetAssemblies();

Hover on t you might get current assemblies that are loaded.

Upvotes: 0

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