我有这个基类:
namespace DynamicGunsGallery
{
public class Module
{
protected string name;
public virtual string GetName() { return name; }
public virtual string GetInfo() { return null; }
}
}
我创建了从基类继承的动态库,例如(AK47.dll)
namespace DynamicGunsGallery
{
public class AK47 : Module
{
public AK47() { name = "AK47"; }
public override string GetInfo()
{
return @"The AK-47 is a selective-fire, gas-operated 7.62×39mm assault rifle, first developed in the USSR by Mikhail Kalashnikov.
It is officially known as Avtomat Kalashnikova . It is also known as a Kalashnikov, an AK, or in Russian slang, Kalash.";
}
}
}
我正在使用它加载动态库(受此链接启发):
namespace DynamicGunsGallery
{
public static class ModulesManager
{
public static Module getInstance(String fileName)
{
/* Load in the assembly. */
Assembly moduleAssembly = Assembly.LoadFile(fileName);
/* Get the types of classes that are in this assembly. */
Type[] types = moduleAssembly.GetTypes();
/* Loop through the types in the assembly until we find
* a class that implements a Module.
*/
foreach (Type type in types)
{
if (type.BaseType.FullName == "DynamicGunsGallery.Module")
{
//
// Exception throwing on next line !
//
return (Module)Activator.CreateInstance(type);
}
}
return null;
}
}
}
我在两者中都包含了基类,我的可执行文件包含 ModuleManager 和 dll 库。编译时我没有问题,但是当我运行此代码时出现错误:
InvalidCastException未处理。
无法将 DynamicGunsGallery.AK47 类型的对象转换为 DynamicGunsGallery.Module
所以问题是:为什么我不能将派生类转换为基类?
还有其他方法可以加载动态库并使用基类中的方法“控制”它吗?