类型查找器 ITypeFinder

 NopCommerce为了支持插件功能，以及支持一些自动注册的功能。系统提供了类型查找器。ITypeFinder以及实现类就是提供此功能。通过类型查找器可以查找本程序域中的类，也可以查找整个bin目录下所有动态链接库中类，并把它们注册到类型反转容器中。ITypeFinder以及实现类如下：

/// <summary>
    /// Classes implementing this interface provide information about types 
    /// to various services in the Nop engine.
    /// </summary>
    public interface ITypeFinder
    {
        IList<Assembly> GetAssemblies();

        IEnumerable<Type> FindClassesOfType(Type assignTypeFrom, bool onlyConcreteClasses = true);

        IEnumerable<Type> FindClassesOfType(Type assignTypeFrom, IEnumerable<Assembly> assemblies, bool onlyConcreteClasses = true);

        IEnumerable<Type> FindClassesOfType<T>(bool onlyConcreteClasses = true);

        IEnumerable<Type> FindClassesOfType<T>(IEnumerable<Assembly> assemblies, bool onlyConcreteClasses = true);
    }

FakeTypeFinder(模拟类型查找器)

 /// <summary>
    /// 模拟类型查找
    /// </summary>
    public class FakeTypeFinder : ITypeFinder
    {
        public Assembly[] Assemblies { get; set; }
        public Type[] Types { get; set; }

        public FakeTypeFinder(Assembly assembly, params Type[] types)
        {
            Assemblies = new[] { assembly };
            this.Types = types;
        }
        public FakeTypeFinder(params Type[] types)
        {
            Assemblies = new Assembly[0];
            this.Types = types;
        }
        public FakeTypeFinder(params Assembly[] assemblies)
        {
            this.Assemblies = assemblies;
        }

        public IList<Assembly> GetAssemblies()
        {
            return Assemblies.ToList();
        }



        public IEnumerable<Type> FindClassesOfType(Type assignTypeFrom, bool onlyConcreteClasses = true)
        {
            return (from t in Types
                    where !t.IsInterface && assignTypeFrom.IsAssignableFrom(t) && (onlyConcreteClasses ? (t.IsClass && !t.IsAbstract) : true)
                    select t).ToList();
        }

        public IEnumerable<Type> FindClassesOfType<T>(bool onlyConcreteClasses = true)
        {
            return FindClassesOfType(typeof(T), onlyConcreteClasses);
        }

        public IEnumerable<Type> FindClassesOfType(Type assignTypeFrom, IEnumerable<Assembly> assemblies, bool onlyConcreteClasses = true)
        {
            return FindClassesOfType(assignTypeFrom, onlyConcreteClasses);
        }

        public IEnumerable<Type> FindClassesOfType<T>(IEnumerable<Assembly> assemblies, bool onlyConcreteClasses = true)
        {
            return FindClassesOfType(typeof(T), onlyConcreteClasses);
        }
    }

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