C#递归拷贝文件夹下文件以及文件夹

演示用递归的方法复制指定文件夹下所有文件(包括子文件夹)到指定位置，比较简单，主要是递归调用，以及字节流读取写入字节操作。直接上代码！

界面设计（WPF设计）

<Window x:Class="LDDECryption.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:LDDECryption"
        mc:Ignorable="d"
        Title="MainWindow" Height="200" Width="600">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition Height="auto"/>
        </Grid.RowDefinitions>
        <DockPanel Grid.Row="0" VerticalAlignment="Center">
            <TextBlock Text="源路径"/>
            <Button Content="..." Name="btnSourceUrl" DockPanel.Dock="Right" Width="60" Click="BtnSourceUrl_Click"/>
            <TextBox Name="txtSourceUrl"/>
        </DockPanel>
        <DockPanel Grid.Row="1" VerticalAlignment="Center">
            <TextBlock Text="目的路径"/>
            <Button Content="..." Name="btnDesUrl" DockPanel.Dock="Right" Width="60" Click="BtnDesUrl_Click"/>
            <TextBox Name="txtDesUrl"/>
        </DockPanel>
        <DockPanel Grid.Row="3">
            <Button Content="确定" Name="btnOk" Width="60" Click="BtnOk_Click"/>
        </DockPanel>
    </Grid>
</Window>

后台代码

using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Forms;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace LDDECryption
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void BtnSourceUrl_Click(object sender, RoutedEventArgs e)
        {
            //OpenFileDialog openFileDialog = new OpenFileDialog();
            //openFileDialog.ShowDialog();
            FolderBrowserDialog folderBrowser = new FolderBrowserDialog();
            folderBrowser.Description = "选择源路径";
            folderBrowser.ShowNewFolderButton = false;
            folderBrowser.RootFolder = Environment.SpecialFolder.MyComputer;
            if (folderBrowser.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                this.txtSourceUrl.Text = folderBrowser.SelectedPath;
            }
        }

        private void BtnDesUrl_Click(object sender, RoutedEventArgs e)
        {
            FolderBrowserDialog folderBrowser = new FolderBrowserDialog();
            folderBrowser.Description = "选择目的路径";
            folderBrowser.ShowNewFolderButton = true;
            folderBrowser.RootFolder = Environment.SpecialFolder.MyComputer;
            if (folderBrowser.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                this.txtDesUrl.Text = folderBrowser.SelectedPath;
            }
        }

        private void BtnOk_Click(object sender, RoutedEventArgs e)
        {
            var sour = this.txtSourceUrl.Text.Trim();
            if (!Directory.Exists(sour))
            {
                System.Windows.MessageBox.Show("源路径不存在");
                return;
            }
            var des = txtDesUrl.Text.Trim();
            if (!Directory.Exists(des))
            {
                Directory.CreateDirectory(des);
            }
            DescryptionCopy(sour, des);
            System.Windows.MessageBox.Show("OK!", "", MessageBoxButton.OK);
        }

        /// <summary>
        /// 复制文件夹==递归方法
        /// </summary>
        /// <param name="strSource">源文件夹</param>
        /// <param name="strDes">目标文件夹</param>
        private void DescryptionCopy(string strSource, string strDes)
        {
            if (!Directory.Exists(strSource))
            {
                return;
            }
            //
            var strDesNew = System.IO.Path.Combine(strDes, System.IO.Path.GetFileName(strSource));
            if (!Directory.Exists(strDesNew))
            {
                Directory.CreateDirectory(strDesNew);
            }
            var fileList = Directory.GetFileSystemEntries(strSource);
            if (fileList == null || fileList.Length == 0)
            {
                return;
            }
            for (int i = 0; i < fileList.Length; i++)
            {
                var file = fileList[i];
                if (Directory.Exists(file))
                {
                    var des = System.IO.Path.Combine(strDesNew, System.IO.Path.GetFileName(file));
                    DescryptionCopy(file, strDesNew);
                }
                else
                {
                    var des = System.IO.Path.Combine(strDesNew, System.IO.Path.GetFileName(file));
                    FileCopy(file, des);
                }
            }
        }

        /// <summary>
        /// 文件拷贝
        /// </summary>
        /// <param name="fileSource"></param>
        /// <param name="fileDestination"></param>
        private void FileCopy(string fileSource, string fileDestination)
        {
            FileStream readStream = new FileStream(fileSource, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            var buff = new Byte[1024 * 1024 * 10];//10M
            FileStream writStream = new FileStream(fileDestination, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Read);
            //
            int off;
            do
            {
                off = readStream.Read(buff, 0, buff.Length);
                writStream.Write(buff, 0, off);
            } while (off > 0);
            readStream.Close();
            writStream.Flush();
            writStream.Close();
        }

    }
}

//

System.IO.File.Copy(file, path, true);此方法即可复制指定文件到指定目录。