C#关于反射加载的问题

三个程序集：
主程序集：BaseApp.exe
接口程序集：IBaseApplication
插件程序集：TestAttri
=======================================================================================
在接口程序中：
接口：IApp
属性定义：ModuleAttribute


代码如下:

public interface IApp : IMothed
{
void ParentForm(IApp frm);
}
namespace IBaseApplication.Attributes
{
[AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Interface | AttributeTargets.Field | AttributeTargets.Method | AttributeTargets.Class | AttributeTargets.Property, AllowMultiple = true, Inherited = false)]
public class ModuleAttribute : Attribute
{
public string IdName { get; set; }
public string ModuleName { get; set; }
public Type ModuleType { get; set; }
//public string AsmName { get; set; }
//public string ClassName { get; set; }
public string Description { get; set; }
}
}

在插件程序集中：
在该插件程序集中的AssemblyInfo类中标识如下


代码如下:

[assembly: IBaseApplication.Attributes.Module(ModuleType = typeof(UserControl1), IdName = "be4d9a5b-0455-4e9d-a255-25122b80bef1-UserControl1", ModuleName = "UserControl1", Description = "")]
[assembly: IBaseApplication.Attributes.Module(ModuleType = typeof(UserControl2), IdName = "be4d9a5b-0455-4e9d-a255-25122b80bef1-UserControl2", ModuleName = "UserControl2", Description = "")]

有两个模块分别是以下


代码如下:

namespace TestAttri
{
public partial class UserControl1 : UserControl, IApp
{
……
}
}
namespace TestAttri
{
public partial class UserControl2 : UserControl, IApp
{
……
}
}

=================================================================================================
在主程序集中：
将插件放至到：Application.StartupPath + "\\Plus"
引用了接口程序集“IBaseApplication”


代码如下:

/// <summary>
/// 获取插件文件名称
/// </summary>
/// <returns></returns>
public string[] GetPlusFiles()
{
return System.IO.Directory.GetFiles(Application.StartupPath + "\\Plus");
}
/// <summary>
/// 加载插件
/// </summary>
public void LoadPluFiles()
{
string[] files = GetPlusFiles();
Assembly assembly = Assembly.GetCallingAssembly();
foreach (string file in files)
{
ModuleAttribute[] attributes = Assembly.LoadFile(file).GetCustomAttributes(typeof(ModuleAttribute), false) as ModuleAttribute[];
foreach (ModuleAttribute attribute in attributes)
{
string m = attribute.ModuleType.FullName;
string m1 = attribute.ModuleType.Assembly.GetName().Name;
object obj = Activator.CreateInstance(attribute.ModuleType);
if (obj is IApp)
{//无法识别两个模块的接口。
}
}
}
}