C#文件流读写TXT文件内容，基础的FSO文件操作源码，实现过程，先引入using System.Linq using System.IO命名空间，创建类，使用File.Exists判断所需读写的文件是否存在，然后使用StreamWriter读取文件内容，而后StreamReader显示文件内容，同时加入Exception异常处理相关操作。

(没有文件，原文件不完全或已损坏或有密码)

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