Question

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);
    }
}

Answer 1

据我所知，你想从DLL中创建一个自定义类的sublcass。在C＃中是不可能的。如果您无法访问类的代码，则无法更改其继承层次结构。请考虑使用List<object>来存储您的对象。

Answer 2

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.

Load class from DLL, instantiate it as another class children

2 个答案: