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。-C# file streams to read and write the contents of the TXT file, the FSO file operations source implementation process, first introduced using System.Linq　using System.IO naming the space, create a class, to use the File.Exists judgment to read and write the file exists, then use the StreamWriter to read the contents of the file, and then StreamReader display the contents of a file, while adding Exception exception handling.