C# 反射 - 从基类中获取超类的通用参数类型

Question

Consider the classes:

public class Super : Base<Test, Super>
{
    public Super Next { get; set; }
}

public class Base<TArg, TSuper>
{
    public Type GetTestArgument()
    {
        Type[] arguments = typeof(TSuper).GetProperty("Next").PropertyType.BaseType.GetGenericTypeDefinition().GetGenericArguments();
        // arguments is set to [ TArg, TSuper ] instead of [ Test, Super ]
        return arguments[0]; // should be Test
    }
}

Does anyone know how to get the generic type from within the base class without calling typeof(TArg) because I'll be iterating through other super classes properties and it must be via deeper reflection.

Thanks.

Answer 1

You've got a call to GetGenericTypeDefinition() , which you probably don't want. Ie:

typeof(TSuper).GetProperty("Next").PropertyType.BaseType.GetGenericArguments()

typeof(TSuper).GetProperty("Next").PropertyType.BaseType returns the type Base<Test, Super> . So calling GetGenericArguments() on it returns [Test, Super] .

Calling GetGenericTypeDefinition() on that gives you Base<TArg, TSuper> , and calling GetGenericArguments() on it returns [TArg, TSuper] .