C#~使用FileSystemWatcher来监视文件系统的变化

对于一个文件夹的改变，C#这边有自己的类来实现，我们不需要关心它的内部实现机制，不需要关心它底层调用哪些API，我们只需要关心如何去调用它，如何让它帮助我们记录文件夹的修改情况即可。

   #region 监视文件夹的变化

            FileSystemWatcher watcher = new FileSystemWatcher();

            watcher.Path = "f:\\";

            watcher.NotifyFilter =//被监控的方面

               NotifyFilters.LastWrite |

               NotifyFilters.FileName |

               NotifyFilters.DirectoryName;

            // 订阅一些事件，当它被触发时（.net(windows)底层触发它，我们不用管），执行我们的方法

            watcher.Changed += (object source, FileSystemEventArgs e) =>

            {

                Console.WriteLine("文件{0}已经被修改,修改类型{1}", e.FullPath, e.ChangeType.ToString());

            };

            watcher.Created += (object source, FileSystemEventArgs e) =>

            {

                Console.WriteLine("文件{0}被建立", e.FullPath);

            };

            watcher.Deleted += (object source, FileSystemEventArgs e) =>

            {

                Console.WriteLine("文件{0}已经被删除", e.FullPath);

            };

            watcher.Renamed += (object source, RenamedEventArgs e) =>

            {

                Console.WriteLine("文件{0}的名称已经从{1}变成了{2}", e.OldFullPath, e.OldName, e.Name);

            };

            // 为true表示开启FileSystemWatcher组件，反之我们的监控将不启作用

            watcher.EnableRaisingEvents = true;

            #endregion

另外，告诉大家一个 xor异或运算的使用技巧，就是它可以在不引入第三个变量的情况下，交替两个变量的值，你的变量可以是数值，也可以是字符，如果是字符，我们需要使用它的hashcode值进行xor运算。

           #region xor两个变量交换
            int a = 2;
            int b = 3;
            Console.WriteLine("a={0}", a);
            Console.WriteLine("b={0}", b);
            a = a ^ b ^ (b = a);
            Console.WriteLine("a={0}", a);
            Console.WriteLine("b={0}", b);
            #endregion

结果如图：

aaarticlea/png;base64,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" alt="" />

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C#~使用FileSystemWatcher来监视文件系统的变化

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