C#.Net反射(Reflaction)技术实例详解

//委托定义-用于增加订单时触发的事件
public delegate void OnAddOrder(Order myOrder);

//委托定义-用于运行的多线程中某一线程访问主线程中的方法
public delegate void OnShowData(int index, int value);


// 来源:www.CSFramework.com, C/S结构框架学习网

/// <summary>
/// 订单管理类(订单模块的业务逻辑)
/// </summary>
public class OrderManager
{
   private event OnAddOrder _OnOrderAdded;//事件定义
   
   private IList _MyOrders = new ArrayList(); //订单列表
   
   //
   //写个例子测试Customer(实体类),Order(实体类),OrderManager(业务逻辑类)3个类的业务关系.
   //
   //通常把Customer,Order视为实体类,他们不包含业务方法,但必须定义一个业务逻辑类OrderManager
   //来管理业务,那么所有有关业务操作都应该封装在业务逻辑类.
   //
   
   #region 演示订单管理类的2个业务方法
   
   /// <summary>
   /// 获取指定客户编号的订单
   /// </summary>
   public IList GetOrderByCustomer(string customer)
   {
      IList result = new ArrayList();
      foreach (Order o in _MyOrders)
      if (o.CustomerCode.Equals(customer)) result.Add(o);
      return result;
   }
   
   /// <summary>
   /// 获取所有订单的总数
   /// </summary>
   /// <returns></returns>
   public decimal GetTotalAmount()
   {
      decimal total = 0;
      foreach (Order o in _MyOrders)
      total = o.Price * o.Quantity;
      return total;
   }
   
   #endregion
   
   /// <summary>
   /// 往订单表加入一张订单
   /// </summary>
   public void AddOrder(Order myOrder)
   {
      //设置一个新编号
      myOrder.OrderID = myOrder.OrderID "(" (_MyOrders.Count 1).ToString() ")";
      
      _MyOrders.Add(myOrder);
      
      //触发事件!!!
      if (_OnOrderAdded != null) _OnOrderAdded(myOrder);
   }
   
   /// <summary>
   /// 订单业务类的事件
   /// </summary>
   public event OnAddOrder OnOrderAdded
   {
      add
      {
         _OnOrderAdded = new OnAddOrder(value); //定义事件的Add方法
         } //语法请参考C#第4版
         
         remove
         {
            _OnOrderAdded -= new OnAddOrder(value);//定义事件的remove方法
            }//语法请参考C#第4版
         }
         
         /// <summary>
         /// 返回所有订单
         /// </summary>
         public IList OrderList { get { return _MyOrders; } }
         
      }
      
      
      // 来源:www.CSFramework.com, C/S结构框架学习网
      

//作业3的业务逻辑类
public class JobManager
{
   public void LoadTypes(Assembly asm, ListBox.ObjectCollection items)
   {
      Type[] types = asm.GetTypes();
      items.Clear();
      foreach (Type t in types) items.Add(t);
   }
   
   public void LoadProperties(Type current, ListBox.ObjectCollection items)
   {
      PropertyInfo[] ps = current.GetProperties(BindingFlags.Public | BindingFlags.Instance);
      items.Clear();
      foreach (PropertyInfo p in ps) items.Add(p);
   }
   
   public void LoadMethods(Type current, ListBox.ObjectCollection items)
   {
      MethodInfo[] ms = current.GetMethods();
      items.Clear();
      foreach (MethodInfo m in ms) items.Add(m);
   }
   
   public void LoadEvents(Type current, ListBox.ObjectCollection items)
   {
      EventInfo[] es = current.GetEvents();
      items.Clear();
      foreach (EventInfo e in es) items.Add(e);
   }
   
   public void LoadFields(Type current, ListBox.ObjectCollection items)
   {
      FieldInfo[] fs = current.GetFields(BindingFlags.NonPublic | BindingFlags.Instance);
      items.Clear();
      foreach (FieldInfo f in fs) items.Add(f);
   }
   
   public void SetPropertyValue(object instance, string propertyName, object value)
   {
      PropertyInfo p = instance.GetType().GetProperty(propertyName);
      if (p == null) return; //没找到属性,不处理
      
      p.SetValue(instance, value, null);
   }
   
   public string GetCustomAttributeValue()
   {
      StringBuilder result = new StringBuilder();
      result.AppendLine("特性的值如下:--------------------------");
      
      //取出指定为MyCustomAttribute类型的特性
      //注意:这里是取类的特性.参考Customer类名上的特性定义.
      object[] list = typeof(Customer).GetCustomAttributes(typeof(MyCustomAttribute),false);
      
      if (list.Length > 0)
      {
         MyCustomAttribute att = list[0] as MyCustomAttribute;
         result.AppendLine(att.Description);
      }
      
      //获取Test方法的用户自定义特性
      object[] attrs = typeof(Customer).GetMethod("Test").GetCustomAttributes(false);
      
      if (attrs.Length == 2) //我在Test方法上定义了两个Attribute特性
      {
         DescriptionAttribute att1 = attrs[0] as DescriptionAttribute;//.NetFramework内定义的
         MyCustomAttribute att2 = attrs[1] as MyCustomAttribute; //自定义的
         
         result.AppendLine(att1.Description);
         result.AppendLine(att2.Description);
      }
      
      return result.ToString();
   }
}

// 来源:www.CSFramework.com, C/S结构框架学习网

/// <summary>
/// 客户实体类
/// </summary>
[MyCustomAttribute("MyCustomAttribute:这是Customer类的特性,在类名上定义")]
public class Customer
{
   //用户属性
   //注意命名规则:
   // 1.类的字段变量名建议加"_"，用于区别其它方法内的变量.
   // 2.当变量较多，更方便排序.
   private string _CustomerID;
   private string _CustomerName;
   private string _CustomerAddress;
   
   //无参构造器
   public Customer() { }
   
   //构造器重载
   public Customer(string id, string name, string address)
   {
      _CustomerID = id;
      _CustomerName = name;
      _CustomerAddress = address;
   }
   
   /// <summary>
   /// 客户编号
   /// </summary>
   public string CustomerID
   {
      get { return _CustomerID; }
      set { _CustomerID = value; }
   }
   
   /// <summary>
   /// 客户名称
   /// </summary>
   public string CustomerName
   {
      get { return _CustomerName; }
      set { _CustomerName = value; }
   }
   
   /// <summary>
   /// 客户地址
   /// </summary>
   public string CustomerAddress
   {
      get { return _CustomerAddress; }
      set { _CustomerAddress = value; }
   }
   
   //重写ToString()方法，返回客户名称
   public override string ToString()
   {
      return string.Format("ID:{0}, Name:{1}, Address:{2}", _CustomerID, _CustomerName, _CustomerAddress);
   }
   
   private string PrivateProperty
   {
      get { return ""; }
   }
   
   [MyCustomAttribute("MyCustomAttribute:这是用户自定义特性,演示Attribute(特性)的应用")]
   [DescriptionAttribute("DescriptionAttribute: 这是.Net自带的Description特性")]
   public void Test()
   {
      //注意:这个方法定义了两个特性,在演示程序内会获取这两个特性并显示他们的值.
   }
}

// 来源:www.CSFramework.com, C/S结构框架学习网