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我希望在绑定场景中执行繁重操作时使用标志在 Silverlight 中实现挂起和恢复绑定。

我的问题是在现有项目中使用了重绑定绘图机制。

在 silverlight 中使用 UpdateTrigger() 我们可以实现手动触发绑定。

但它是一个巨大的产品。无法更新和查找手动触发绑定等的位置并更改项目。

因此，我们计划使用 Microsoft Unity 通过在重载绘图操作上使用标志挂起和恢复绑定来快速修复。这可能是在绘制绑定对象时对当前性能问题的快速修复。

我希望在为不同类型的属性设置值之前检查一个布尔标志？在属性设置器之前，我搜索了很多并且厌倦了找到拦截。但是没有找到方法。还在战斗。这是我的确切要求。

有人帮忙吗？

添加了示例代码尝试，

//Empty Interface may be used in interface interception, not sure.
public interface ISetter 
{ 
}

//Implementation of ISetter, this type needs to be intercepted while setting the FirstName //property    
public class Man : ISetter
{

 private string firstName;

 public Man() 
 { 
 }

 [NotifyHandler]     //Expected: this handler should be called when FirstName property set
 public string FirstName
 {
   get { return firstName; }
   set { firstName = value; }
 }

}

public class NotifyHandler : ICallHandler   
{        
   public Boolean Before { get; set; }
   public Boolean After { get; set; }
   public String Message { get; set; }
   int ICallHandler.Order { get; set; }

   IMethodReturn ICallHandler.Invoke(IMethodInvocation input, 
                                     GetNextHandlerDelegate getNext)      
   {           
      if (this.Before == true) 
      {
         Debug.WriteLine(this.Message);          
      }

      IMethodReturn result = getNext()(input, getNext);  

      if (result.Exception != null) 
      {  
         Debug.WriteLine(result.Exception.Message);        
      } 
      else 
      {  
         if (this.After == true) 
         {  
            Debug.WriteLine(this.Message);
         }
      }     
      return (result);       
   }  
}

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Property 
                                       | AttributeTargets.Method)]
Public class NotifyHandlerAttribute : HandlerAttribute
{
  public NotifyHandlerAttribute() 
  { 
  }

  public override ICallHandler CreateHandler(IUnityContainer ignored)
  {
     return new NotifyHandler();
  }
}

public abstract class HandlerAttribute : Attribute
{
        /// Derived classes implement this method. When called, it creates a 
        /// new call handler as specified in the attribute configuration.
        /// The parameter "container" specifies the IUnityContainer 
        /// to use when creating handlers, if necessary.
        /// returns a new call handler object.
  public abstract ICallHandler CreateHandler(IUnityContainer container);
  private int executionorder;

  /// <summary>
  ///    Gets or sets the order in which the handler will be executed.
  /// </summary>
  public int Order
  {
      get { return this.executionorder; }
      set { this.executionorder = value; }
  }
}

//Interception registered in the application start up

private void Application_Startup(object sender, StartupEventArgs e)
{
    IUnityContainer container = new UnityContainer();

    container.AddNewExtension<Interception>();
    container.RegisterType<Man>().Configure<Interception>();

    var m1 =container.Resolve<Man>();
    m1.FirstName = "test";

    Man m = new Man();
    m.FirstName = "fine";

 }

在上面这两个 FirstName setter 属性都没有调用 NotifyHandler。

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0 回答 0