设计模式-观察者模式ObserverPattern详解资源-CSDN下载

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json：32个

79 浏览量 2025-02-23 15:58:05 上传评论收藏 445KB 7Z 举报

观察者模式是一种行为设计模式，用于建立一种对象间的一对多的依赖关系，当一个对象的状态发生改变时，所有依赖于它的对象都会得到通知并自动更新。在软件开发中，观察者模式非常常见，尤其适用于事件驱动编程。本文将详细探讨观察者模式的经典实现方式，并介绍三种其他实现方式以及六个方向的问题优化的详细代码。观察者模式的经典实现涉及两个主要对象：主题（Subject）和观察者（Observer）。主题维护一组观察者，并在状态变化时通知它们。观察者则订阅主题，以便在主题状态改变时接收通知。在C#中，这通常通过接口来实现，例如定义一个IObservable接口和一个IObserver接口。主题会实现IObservable接口，提供方法来添加或移除观察者，以及通知所有观察者状态变化。观察者则实现IObserver接口，以便在被通知时接收数据。除了这种经典实现，观察者模式还有其他几种变体。例如，带有推（Push）和拉（Pull）模型的实现。在推模型中，主题主动向观察者推送所有相关的数据，而在拉模型中，观察者从主题中拉取自己感兴趣的数据。另外，还可以有同步和异步的实现方式，以及单播和广播的实现方式。针对问题优化方面，观察者模式可能面临几个方向的挑战，比如性能问题、内存泄漏、线程安全问题等。为了优化性能，可以减少通知的频率，或者采用延迟通知的策略。在内存泄漏方面，确保在不再需要时取消订阅是关键。线程安全问题则需要在通知观察者时使用同步机制来避免。此外，还可以考虑使用弱引用的观察者来防止内存泄漏。在本文中，我们将通过示例代码，逐一展示如何使用C#实现观察者模式的不同方面，包括接口定义、主题类和观察者类的实现，以及在不同场景下如何优化和应用观察者模式。最终，观察者模式的应用非常广泛，从UI框架、事件驱动的中间件，到各种基于事件的系统设计，都能看到它的身影。掌握观察者模式的实现方式和优化策略，对于任何需要处理组件间通信和数据同步的软件工程师来说，都是一项必不可少的技能。

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设计模式- 观察者模式 Observer Pattern详解（301个子文件）

designpatterns.projects.v9.bin 717KB

designpatterns.strings.v9.bin 206KB

designpatterns.metadata.v9.bin 5KB

F.ObserverPattern.IObservableAndIObserver.Ext.Reactive.assets.cache 934B

F.ObserverPattern.IObservableAndIObserver.Ext.Reactive.csproj.AssemblyReference.cache 535B

project.nuget.cache 467B

project.nuget.cache 357B

project.nuget.cache 355B

project.nuget.cache 341B

project.nuget.cache 335B

project.nuget.cache 333B

project.nuget.cache 325B

project.nuget.cache 317B

project.nuget.cache 315B

project.nuget.cache 313B

project.nuget.cache 307B

project.nuget.cache 303B

project.nuget.cache 295B

K.ObserverPattern.PullModel.assets.cache 211B

E.ObserverPattern.IObservableAndIObserver.Ext.Filter.assets.cache 211B

J.ObserverPattern.PushModel.assets.cache 211B

N.ObserverPattern.AvoidingDanglingReferences.assets.cache 211B

B.ObserverPattern.DelegatesAndEvents.assets.cache 211B

C.ObserverPattern.IObservableAndIObserver.assets.cache 211B

H.ObserverPattern.Registration.assets.cache 211B

I.ObserverPattern.Trigger.assets.cache 211B

D.ObserverPattern.IObservableAndIObserver.Ext.Async.assets.cache 211B

G.ObserverPattern.ChangeManager.assets.cache 211B

L.ObserverPattern.HybridPushPull.assets.cache 211B

M.ObserverPattern.OptimizedCommunication.assets.cache 211B

A.ObserverPattern.GoF.assets.cache 211B

K.ObserverPattern.PullModel.AssemblyInfoInputs.cache 66B

E.ObserverPattern.IObservableAndIObserver.Ext.Filter.AssemblyInfoInputs.cache 66B

J.ObserverPattern.PushModel.AssemblyInfoInputs.cache 66B

N.ObserverPattern.AvoidingDanglingReferences.AssemblyInfoInputs.cache 66B

B.ObserverPattern.DelegatesAndEvents.AssemblyInfoInputs.cache 66B

C.ObserverPattern.IObservableAndIObserver.AssemblyInfoInputs.cache 66B

H.ObserverPattern.Registration.AssemblyInfoInputs.cache 66B

C.ObserverPattern.IObservableAndIObserver.AssemblyInfoInputs.cache 66B

H.ObserverPattern.Registration.AssemblyInfoInputs.cache 66B

I.ObserverPattern.Trigger.AssemblyInfoInputs.cache 66B

D.ObserverPattern.IObservableAndIObserver.Ext.Async.AssemblyInfoInputs.cache 66B

G.ObserverPattern.ChangeManager.AssemblyInfoInputs.cache 66B

L.ObserverPattern.HybridPushPull.AssemblyInfoInputs.cache 66B

M.ObserverPattern.OptimizedCommunication.AssemblyInfoInputs.cache 66B

F.ObserverPattern.IObservableAndIObserver.Ext.Reactive.AssemblyInfoInputs.cache 66B

A.ObserverPattern.GoF.AssemblyInfoInputs.cache 66B

Program.cs 7KB

Program.cs 6KB

Program.cs 4KB

Program.cs 3KB

Program.cs 2KB

Program.cs 1KB

F.ObserverPattern.IObservableAndIObserver.Ext.Reactive.AssemblyInfo.cs 1KB

E.ObserverPattern.IObservableAndIObserver.Ext.Filter.AssemblyInfo.cs 1KB

D.ObserverPattern.IObservableAndIObserver.Ext.Async.AssemblyInfo.cs 1KB

N.ObserverPattern.AvoidingDanglingReferences.AssemblyInfo.cs 1KB

C.ObserverPattern.IObservableAndIObserver.AssemblyInfo.cs 1KB

M.ObserverPattern.OptimizedCommunication.AssemblyInfo.cs 1KB

B.ObserverPattern.DelegatesAndEvents.AssemblyInfo.cs 1KB

L.ObserverPattern.HybridPushPull.AssemblyInfo.cs 1KB

G.ObserverPattern.ChangeManager.AssemblyInfo.cs 1KB

H.ObserverPattern.Registration.AssemblyInfo.cs 1KB

K.ObserverPattern.PullModel.AssemblyInfo.cs 1KB

J.ObserverPattern.PushModel.AssemblyInfo.cs 1KB

K.ObserverPattern.PullModel.AssemblyInfo.cs 1KB

共 301 条

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