) 第 I 页基于.NET 架构的网络多媒体通信系统摘要多媒体通讯系统最初为聊天而诞生，但其作用早已超出了聊天的范畴，多媒体通讯系统在生活中中将发挥更大的作用。目前国内的多媒体通讯软件越来越丰富，功能越来越强大。本系统主要叙述了用 C#开发的一个多媒体通讯系统，系统采用 Visual Studio 2008 作为开发平台，数据库为 SQL Server 2005。探讨了多媒体通讯系统所涉及到的一些技术：如多线程技术、聊天记录加密、信息服务模式、软件体系的三层架构、文件发送下载、系统安全技术的使用等；本系统实现了用户注册、用户隐身登入、记住密码、添加好友和删除好友、好友聊天、用户个人信息修改、查看好友资料、聊天窗口抖动、用户在线隐身设置等功能。本系统界面美观大方，操作简单，完全能够作为中小型企业或事业单位内部通讯软件。关键词：多媒体通讯系统； C#；聊天系统；多媒体；通讯工具) 第 II 页Network Multimedia Communication System Based On The .NET FrameworkABSTRACTMultimedia communication system for an initial chat with the birth, but its role has long been beyond the scope of chat, multimedia communication system will play a greater role in life. At present, domestic multimedia communication software is more and more abundant and these functions are more and more powerful. This paper is described the development of a multimedia communication system written by C #, The system using Visual Studio 2008 as a development platform, The database is SQL Server 2005. This paper discusses the multimedia communication system involved some of the technologies: such as multithreading technology, chat logs encryption, information service mode, software system with three layers framework, File upload and download , technology of system security, etc.; This system realizes the user registration, the user login stealth and remember the password function, add buddy and remove buddy, buddy chat, customer information changes, view friends material, chat window jitter, users online stealth set etc. function . This system is beautiful and use easily, simple operation, can completely as small and medium-sized enterprise or business unit interior communication software.Key word：Multimedia Communication Systems； C #； Chat System； Multimedia；Communication Tools ) 第 III 页目录1 概述.11.1 项目背景.11.2 开发目的.11.3 研究的内容和重点解决的问题.21.3.1 研究内容.21.3.2 重点解决的问题.21.4 平台要求.21.4.1 硬件平台.21.4.2 软件平台.32 可行性研究.42.1 可行性分析重要性.42.2 经济可行性.42.3 技术可行性.42.4 操作可行性.42.5 法律可行性.52.6 可行性研究结论.53 系统分析.63.1 需求获取.63.2 需求分析.63.2.1 注册需求.63.2.2 通讯需求.63.2.3 好友管理需求.7 3.2.4 性能需求.73.3 系统 UML 基本模型.83.3.1 系统用例图.8) 第 IV 页3.3.2 系统活动图.