C#文件分割

http://www.oschina.net/code/snippet_222150_8303

 

[代码] 文件分割（适合小文件，小于等于64MB）

01using System;

02using System.IO;

03string filetosplit=@"C:\temp\data.bin";

04string targetpath=@"D:\store";

05FileStream fsr = new FileStream(filetosplit, FileMode.Open, FileAccess.Read);

06long FileLength=fsr.Length;

07byte[] btArr = new byte[FileLength];

08fsr.Read(btArr, 0, (int)FileLength);

09fsr.Close();

10int splitcount=3;

11long PartLength=FileLength/splitcount+FileLength%splitcount;

12int nCount=(int)Math.Ceiling((double)FileLength/PartLength);

13string strFileName=Path.GetFileName(filetosplit);

14long byteCount=0;

15for(int i=1;i<=nCount;i++,byteCount=(i<nCount?byteCount+PartLength:FileLength-PartLength))

16{

17    FileStream fsw = new FileStream(targetpath + Path.DirectorySeparatorChar+ strFileName +i, FileMode.Create, FileAccess.Write);

18    fsw.Write(btArr, (int)byteCount, (int)(i<nCount?PartLength:FileLength-byteCount));

19    fsw.Flush();

20    fsw.Close();

21}

[代码] 文件分割（适合大文件，大于64MB）

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01using System;

02using System.IO

03string filetosplit=@"C:\temp\data.bin";

04string targetpath=@"D:\store";

05FileStream fsr = new FileStream(filetosplit, FileMode.Open, FileAccess.Read);

06long FileLength=fsr.Length;

07byte[] btArr = new byte[FileLength];

08fsr.Read(btArr, 0, (int)FileLength);

09fsr.Close();

10int splitcount=3;

11long PartLength=FileLength/splitcount+FileLength%splitcount;

12int nCount=(int)Math.Ceiling((double)FileLength/PartLength);

13string strFileName=Path.GetFileName(filetosplit);

14long byteCount=0;

15for(int i=1;i<=nCount;i++,byteCount=(i<nCount?byteCount+PartLength:FileLength-PartLength))

16{

17    FileStream fsw = new FileStream(targetpath + Path.DirectorySeparatorChar+ strFileName +i, FileMode.Create, FileAccess.Write);

18    long bc=byteCount;

19    long PartCount=i<nCount?PartLength:FileLength-bc;

20    int PartBufferCount=(int)(PartCount<int.MaxValue/32?PartCount:int.MaxValue/32);

21    int nc=(int)Math.Ceiling((double)PartCount/PartBufferCount);

22    for(int j=1;j<=nc;j++,bc=(j<nCount?bc+PartBufferCount:PartCount-PartBufferCount))

23        fsw.Write(btArr, (int)bc, (int)(j<nc?PartBufferCount:PartCount-bc));

24    fsw.Flush();

25    fsw.Close();

26}

27fsr.Close();