Untitled

Type equality check in C#
public abstract class CompositionPlugin { ... }

public class MyCompositionPlugin : CompositionPlugin { ... }

public class Framework {

    public IList<CompositionPlugin> CompositionPlugins = new List<CompositionPlugin>();

    public CompositionPlugin GetCompositionPlugin(Type ofType)
    {
        foreach (CompositionPlugin plugin in CompositionPlugins)
        {
            if (plugin.GetType().Equals(ofType))
                return plugin;
        }

        throw new ArgumentException("A composition plugin of type " + ofType.FullName + " could not be found");
    }
}

Framework framework = new Framework();
// Adding the plugin to the framework is done by loading an assembly and
// checking if it contains plugin-compatible classes (i.e. subclasses
// of <CompositionPlugin>)
framework.RegisterAssembly("E:\Projects\Framework\MyPlugin\bin\Debug\MyPlugin.dll");
CompositionPlugin plugin = framework.GetCompositionPlugin(typeof(MyCompositionPlugin));

if (ofType.IsAssignableFrom(plugin.GetType())

class A {}

bool TestType(A item, Type ofType)
{
    return item.GetType().Equals(ofType);
}

Console.WriteLine(TestType(new A(), typeof(A))); // True
Console.WriteLine(TestType(new A(), typeof(string))); // False

class CompositionPlugin {}
class MyCompositionPlugin : CompositionPlugin  {}

// Define other methods and classes here
bool TestType(CompositionPlugin item, Type ofType)
{
    return item.GetType().Equals(ofType);
}

Console.WriteLine(TestType(new CompositionPlugin(),
            typeof(CompositionPlugin))); //True
Console.WriteLine(TestType(new CompositionPlugin(),
            typeof(MyCompositionPlugin))); //False
Console.WriteLine(TestType(new MyCompositionPlugin(),
            typeof(CompositionPlugin))); //False
Console.WriteLine(TestType(new MyCompositionPlugin(),
            typeof(MyCompositionPlugin))); //True

if (plugin is ofType)
    return plugin;

public class Framework {

    public IList<CompositionPlugin> CompositionPlugins = new List<CompositionPlugin>();

    public CompositionPlugin GetCompositionPlugin(Type ofType)
    {
        using(var writer = System.IO.File.CreateText(@"C:test.log"))
        {
            writer.WriteLine("ofType: " + ofType.toString());
            foreach (CompositionPlugin plugin in CompositionPlugins)
            {
                writer.WriteLine("plugin: " + plugin.GetType().toString());
                if (plugin.GetType().Equals(ofType))
                    return plugin;
            }
        }

        throw new ArgumentException("A composition plugin of type " + ofType.FullName + " could not be found");
    }
}

public CompositionPlugin GetCompositionPlugin(Type ofType)
{
    foreach (CompositionPlugin plugin in CompositionPlugins)
        if (ofType.AssemblyQualifiedName.Equals(plugin.GetType().AssemblyQualifiedName))
            return plugin;

    throw new ArgumentException("A composition plugin of type " + ofType.FullName + " could not be found");
}