Given a particular interface ITarget<T> and a particular type myType, here's how you would determine T if myType implements ITarget<T>. (This code snippet is taken from the answer to an earlier question.)

foreach (var i in myType.GetInterfaces ())
    if (i.IsGenericType
        && i.GetGenericTypeDefinition() == typeof(ITarget<>))
        return i.GetGenericArguments ()[0] ;

However, this only checks a single type, myType. How would I create a dictionary of all such type parameters, where the key is T and the value is myType? I think it would look something like this:

var searchTarget = typeof(ITarget<>);
var dict = Assembly.GetExecutingAssembly().[???]
             .Where(t => t.IsGenericType
                    && t.GetGenericTypeDefinition() == searchTarget)
             .[???];

What goes in the blanks?