FileStrem大文件分割复制

 using System;

 using System.Collections.Generic;

 using System.ComponentModel;

 using System.Data;

 using System.Drawing;

 using System.IO;

 using System.Linq;

 using System.Runtime.InteropServices;

 using System.Text;

 using System.Threading.Tasks;

 using System.Windows.Forms;

 namespace FileStrem大文件分割复制

 {

     public partial class Form1 : Form

     {

         private int WriterByetNub = ;//100M复制速度

         //源目标

         private FileStream FileToRead;

         //复制到文件

         private FileStream FileToWrite;

         //保存文件的地址

         private string SaveFile_Add;

         //源文件的名字

         private string File_Add;

         //设置正常写入字节

         private Byte[] byteToWrite;

         //设置剩余写入字节

         private Byte[] byteToLastWrite;

         //循环次数

         private long WriteTimes;

         //循环后的剩余字节

         private int L_Size;

         public Form1()

         {

             InitializeComponent();

         }

         //设置委托

         private delegate void OpenFile();

         private void Cpy()

         {

             try

             {

                 label_Add.Text = "源地址";

                 label_Cpy_Add.Text = "复制到";

                 label_Cpy_Lc.Text = "复制进程:";

                 label_Write.Text = "已经写入";

                 label_FileSize.Text = "源文件总大小";

                 //文件选取

                 OpenFileDialog openfileDialog = new OpenFileDialog();

                 //show文件选取器

                 openfileDialog.ShowDialog();

                 File_Add = openfileDialog.FileName;

                 label_Add.Text += "：" + File_Add;

                 //保存地址选取

                 FolderBrowserDialog savefileDialog = new FolderBrowserDialog();

                 savefileDialog.ShowDialog();

                 SaveFile_Add = savefileDialog.SelectedPath;

                 label_Cpy_Add.Text += "：" + SaveFile_Add + File_Add;

                 FileToRead = new FileStream(File_Add, FileMode.Open, FileAccess.Read);

                 FileToWrite = new FileStream(@SaveFile_Add + "\\" + openfileDialog.SafeFileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);

                 label_FileSize.Text = "源文件总大小"+(FileToRead.Length/).ToString()+"KB";

                 if (FileToRead.Length > WriterByetNub)

                 //设置写入字节数组

                 {

                     byteToWrite = new byte[WriterByetNub];

                     //循环次数

                     WriteTimes = FileToRead.Length / WriterByetNub;

                     //多次循环后剩余字节

                     L_Size = Convert.ToInt32(FileToRead.Length % WriterByetNub);

                     //多次循环后字节数组

                     byteToLastWrite = new byte[L_Size];

                     for (long i = ; i <= WriteTimes; i++)

                     {

                         //读源文件

                         FileToRead.Read(byteToWrite, , WriterByetNub);

                         //写数据到目标文件

                         FileToWrite.Write(byteToWrite, , WriterByetNub);

                         //设置进度条的值

                         progressBar.Value = Convert.ToInt32(i *  / WriteTimes);

                         Application.DoEvents();

                         //设置Lable上的进度值

                         label_Cpy_Lc.Text = "复制进程:" + Convert.ToInt32((i * ) / WriteTimes).ToString() + "%";

                         //设置写入值

                         label_Write.Text = "已写入" + (FileToRead.Position / ).ToString() + "KB";

                     }

                     //剩余字节的读和写

                     if (L_Size != )

                     {

                         FileToRead.Read(byteToLastWrite, , L_Size);

                         FileToWrite.Write(byteToLastWrite, , L_Size);

                     }

                 }

                 else

                 {

                     progressBar.Maximum =(int) FileToRead.Length;

                     byteToWrite = new byte[FileToRead.Length];

                     FileToRead.Read(byteToWrite, , (int)FileToRead.Length);

                     label_Cpy_Lc.Text = "复制进程:" + Convert.ToInt32(FileToRead.Position/FileToRead.Length*).ToString() + "%";

                     //设置写入值

                     label_Write.Text = "已写入" + (FileToRead.Position / ).ToString() + "KB";

                     progressBar.Value =(int )FileToRead.Position;

                     FileToWrite.Write(byteToWrite, , (int)FileToRead.Length);

                 }

                 FileToRead.Flush();

                 FileToWrite.Flush();

                 FileToRead.Close();

                 FileToWrite.Close();

                 MessageBox.Show("复制完成");

             }

             catch(Exception ex)

             {

                 FileToRead.Flush();

                 FileToWrite.Flush();

                 FileToRead.Close();

                 FileToWrite.Close();

                 MessageBox.Show(ex.ToString());

             }

         }

         private void openFileBtn_Click(object sender, EventArgs e)

         {

             OpenFile getFile = new OpenFile(Cpy);

             this.Invoke(getFile);

         }

         private void button2_Click(object sender, EventArgs e)

         {

             OpenFileDialog openFileDialog1 = new OpenFileDialog();

             if (openFileDialog1.ShowDialog() == DialogResult.OK)

             {

                 textBox1.Text = openFileDialog1.FileName;

             }

         }

         private void button3_Click(object sender, EventArgs e)

         {

             FolderBrowserDialog f = new FolderBrowserDialog();

             if (f.ShowDialog() == DialogResult.OK)

             {

                 textBox2.Text = f.SelectedPath +@"\"+Path.GetFileName(textBox1.Text.Trim());

             }

         }

         private void button1_Click(object sender, EventArgs e)

         {

             ApiCopyFile.DoCopy(textBox1.Text.Trim(), textBox2.Text.Trim());

         }

     }

     public class ApiCopyFile

     {

         private const int FO_COPY = 0x0002;

         private const int FOF_ALLOWUNDO = 0x00044;

         //显示进度条  0x00044 // 不显示一个进度对话框 0x0100 显示进度对话框单不显示进度条  0x0002显示进度条和对话框

         private const int FOF_SILENT = 0x0002;//0x0100;

         //

         [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto, Pack = )]

         public struct SHFILEOPSTRUCT

         {

             public IntPtr hwnd;

             [MarshalAs(UnmanagedType.U4)]

             public int wFunc;

             public string pFrom;

             public string pTo;

             public short fFlags;

             [MarshalAs(UnmanagedType.Bool)]

             public bool fAnyOperationsAborted;

             public IntPtr hNameMappings;

             public string lpszProgressTitle;

         }

         [DllImport("shell32.dll", CharSet = CharSet.Auto)]

         static extern int SHFileOperation(ref SHFILEOPSTRUCT FileOp);

         public static bool DoCopy(string strSource, string strTarget)

         {

             SHFILEOPSTRUCT fileop = new SHFILEOPSTRUCT();

             fileop.wFunc = FO_COPY;

             fileop.pFrom = strSource;

             fileop.lpszProgressTitle = "复制大文件";

             fileop.pTo = strTarget;

             //fileop.fFlags = FOF_ALLOWUNDO;

             fileop.fFlags = FOF_SILENT;

             return SHFileOperation(ref fileop) == ;

         }

     }

 }