代码大多来源于网络
IDE：vs2017
项目文件：
链接：https://pan.baidu.com/s/1DBUwVw3Blv2vsIBhEmTq6Q
提取码：qmok
界面：
代码：
using System; using System.Net; using System.Windows.Forms; using System.IO; namespace CopyAndCoverFiles { public partial class Form1 : Form { public Form1() { InitializeComponent(); } //窗体载入时执行 private void Form1_Load(object sender, EventArgs e) { //显示当前时间 Text = "北京时间（本地）：" + DateTime.Now.ToString("yyyy年MM月dd dddd HH时mm分"); //启动显示时间的计时器 TimerShowTime.Start(); TimerShowTime.Interval = 60000; //设置倒计时定时器间隔 TimerLastTime.Interval = 1000;//间隔1秒 } //标题栏循环显示时间 private void TimerShowTime_Tick(object sender, EventArgs e) { ShowTime(); } //标题栏显示时间 private void ShowTime() { if (GetNetDateTime() != "") { Text = "北京时间（网络）：" + Convert.ToDateTime(GetNetDateTime()).ToString("yyyy年MM月dd dddd HH时mm分"); } else { Text = "北京时间（本地）：" + DateTime.Now.ToString("yyyy年MM月dd dddd HH时mm分"); } } //获取网络时间 private static string GetNetDateTime() { WebRequest request = null; WebResponse response = null; WebHeaderCollection headerCollection = null; string datetime = string.Empty; try { request = WebRequest.Create("https://www.baidu.com"); request.Timeout = 3000; request.Credentials = CredentialCache.DefaultCredentials; response = request.GetResponse(); headerCollection = response.Headers; foreach (var h in headerCollection.AllKeys) { if (h == "Date") { datetime = headerCollection[h]; } } return datetime; } catch (Exception) { return datetime; } finally { if (request != null) { request.Abort(); } if (response != null) { response.Close(); } if (headerCollection != null) { headerCollection.Clear(); } } } //选择目标文件夹按钮 private void BtnSeleteTargetFolder_Click(object sender, EventArgs e) { if (folderBrowserDialog1.ShowDialog() == DialogResult.OK) { TxbTargetFolder.Text = folderBrowserDialog1.SelectedPath; } } //选择源文件夹按钮 private void BtnSeleteSourceFolder_Click(object sender, EventArgs e) { if (folderBrowserDialog1.ShowDialog() == DialogResult.OK) { TxbSourceFolder.Text = folderBrowserDialog1.SelectedPath; } } //输入源文件夹后遍历显示文件 private void TxbSourceFolder_TextChanged(object sender, EventArgs e) { if (TxbSourceFolder.Text.Trim() != "") { //初始化文件列表 CheckedListBoxFiles.Items.Clear(); //如果文件夹存在 if (Directory.Exists(TxbSourceFolder.Text.Trim())) { try { DirectoryInfo sourceFolder = new DirectoryInfo(TxbSourceFolder.Text); //遍历显示文件 foreach (FileInfo nextFile in sourceFolder.GetFiles()) { CheckedListBoxFiles.Items.Add(nextFile.Name); } } catch (Exception ex) { MessageBox.Show("获取源文件内文件列表失败：" + ex.Message); } } } } //执行按钮 private void BtnCountdown_Click(object sender, EventArgs e) { if (Checking()) { //弹出警告窗口 DialogResult warning = MessageBox.Show("目标文件夹内的同名文件将被覆盖，执行前请备份好目标文件夹，继续吗？", "警告", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning); if (warning == DialogResult.OK) { Start();//开始执行 } } } //暂停按钮 private void BtnPause_Click(object sender, EventArgs e) { Pause();//暂停执行 //修改设置的同步次数 if (toolStripStatusLabel3.Text != "无限") { NumTxbLoopCount.Value = Convert.ToDecimal(toolStripStatusLabel3.Text); } else { NumTxbLoopCount.Value = 0; } } //倒数定时器 private void TimerCountdown_Tick(object sender, EventArgs e) { //暂停倒计时计时器 TimerLastTime.Stop(); //更新显示倒数次数 if (toolStripStatusLabel3.Text != "无限") { int loopCount = Convert.ToInt32(toolStripStatusLabel3.Text); if (loopCount > 0) { loopCount--; //启动倒计时计时器 TimerLastTime.Start(); if (loopCount == 0) { Pause(); } } toolStripStatusLabel3.Text = loopCount + ""; } else { //启动倒计时计时器 TimerLastTime.Start(); } //初始化倒计时显示 toolStripStatusLabel4.Text = SecondToTime(TimerCountdown.Interval / 1000); //复制且覆盖文件 CopyAndCoverFile(); } //复制且覆盖文件 private void CopyAndCoverFile() { if (Checking()) { string targetFolderPath = TxbTargetFolder.Text + @"\";//目标文件夹路径 string sourceFolderPath = TxbSourceFolder.Text + @"\";//源文件夹路径 //遍历复制选中的文件 for (int i = 0; i < CheckedListBoxFiles.CheckedItems.Count; i++) { string fileName = CheckedListBoxFiles.GetItemText(CheckedListBoxFiles.CheckedItems[i]);//取得文件名 try { File.Copy(sourceFolderPath + fileName, targetFolderPath + fileName, true);//复制覆盖同名文件 } catch (Exception ex) { Pause();//暂停执行 MessageBox.Show("执行失败：" + ex.Message); } } } } //倒计时定时器调用 private void TimerLastTime_Tick(object sender, EventArgs e) { //将时：分：秒转换为秒 string[] str = toolStripStatusLabel4.Text.Split(new char[] { ':' }); int lastTime = Convert.ToInt32(str[0]) * 3600 + Convert.ToInt32(str[1]) * 60 + Convert.ToInt32(str[2]); //更新倒计时 if (lastTime == 1) { lastTime = TimerCountdown.Interval / 1000; } else { lastTime--; } toolStripStatusLabel4.Text = SecondToTime(lastTime); } //复制文件前检查 private bool Checking() { bool ok = false; if (TxbTargetFolder.Text.Trim() != TxbSourceFolder.Text.Trim()) { //如果目标文件夹存在 if (Directory.Exists(TxbTargetFolder.Text)) { //如果勾选的文件数大于0 if (CheckedListBoxFiles.CheckedItems.Count > 0) { if (NumTxbHour.Value == 0 && NumTxbMinute.Value == 0 && NumTxbSecond.Value == 0) { MessageBox.Show("倒计时不能为0"); } else { ok = true; } } else { MessageBox.Show("请至少勾选一个文件"); } } //目标文件夹不存在 else { Pause();//暂停执行 MessageBox.Show("目标文件夹不存在，请重新选择"); } } else { MessageBox.Show("目标文件夹和源文件夹路径不能相同"); } return ok; } //开始执行 private void Start() { GroupBoxForm.Enabled = false;//禁用界面输入 BtnCountdown.Enabled = false;//禁用执行按钮 BtnPause.Enabled = true;//启用暂停按钮 //执行间隔时间 int countdown = 0; countdown += Convert.ToInt32(NumTxbHour.Value) * 3600;//小时 countdown += Convert.ToInt32(NumTxbMinute.Value) * 60;//分钟 countdown += Convert.ToInt32(NumTxbSecond.Value);//秒钟 //初始化倒计时显示 toolStripStatusLabel4.Text = SecondToTime(countdown); //设置倒数计时器间隔 TimerCountdown.Interval = countdown * 1000;//单位毫秒 //启动倒数计时器 TimerCountdown.Start(); //启动倒计时定时器 TimerLastTime.Start(); //初始化剩余执行次数 if (NumTxbLoopCount.Value == 0) { toolStripStatusLabel3.Text = "无限"; } else { toolStripStatusLabel3.Text = NumTxbLoopCount.Value + ""; } } //暂停执行 private void Pause() { //停止倒数定时器 TimerCountdown.Stop(); //停止倒计时定时器 TimerLastTime.Stop(); GroupBoxForm.Enabled = true;//启用界面输入 BtnCountdown.Enabled = true;//启用执行按钮 BtnPause.Enabled = false;//禁用暂停按钮 } //将传入的秒钟转换为 时：分：秒 的字符串 private string SecondToTime(int countdown) { string time = ""; string[] arrLastTime = { "0", "0", "0" };//时，分，秒 arrLastTime[0] = countdown / 3600 + "";//得出小时 //得出分钟 if ((countdown % 3600) > 0) { arrLastTime[1] = (countdown % 3600) / 60 + ""; int second = (countdown % 3600) % 60; if (second > 0) { arrLastTime[2] = second + ""; } } time = String.Join(":", arrLastTime); return time; } //托盘图标双击 private void NotifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e) { if (WindowState == FormWindowState.Minimized) { //还原窗体显示 WindowState = FormWindowState.Normal; //激活窗体并给予它焦点 Activate(); //任务栏区显示图标 ShowInTaskbar = true; //托盘区图标隐藏 NotifyIcon1.Visible = false; } } //窗口最小化时 private void Form1_SizeChanged(object sender, EventArgs e) { //判断是否选择的是最小化按钮 if (WindowState == FormWindowState.Minimized) { //隐藏任务栏区图标 ShowInTaskbar = false; //图标显示在托盘区 NotifyIcon1.Visible = true; } } } }