本文实例为大家分享了C# FileStream复制大文件的具体代码,供大家参考,具体内容如下
即每次复制文件的一小段,以节省总内存开销。当然,本机复制也可以采用.NET内部的System.IO.File.Copy方法。
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/// <summary> /// 复制文件 /// </summary> /// <param name="fromFile">要复制的文件</param> /// <param name="toFile">要保存的位置</param> /// <param name="lengthEachTime">每次复制的长度</param> private void CopyFile( string fromFile, string toFile, int lengthEachTime) { FileStream fileToCopy = new FileStream(fromFile, FileMode.Open, FileAccess.Read); FileStream copyToFile = new FileStream(toFile, FileMode.Append, FileAccess.Write); int lengthToCopy; if (lengthEachTime < fileToCopy.Length) //如果分段拷贝,即每次拷贝内容小于文件总长度 { byte [] buffer = new byte [lengthEachTime]; int copied = 0; while (copied <= (( int )fileToCopy.Length - lengthEachTime)) //拷贝主体部分 { lengthToCopy = fileToCopy.Read(buffer, 0, lengthEachTime); fileToCopy.Flush(); copyToFile.Write(buffer, 0, lengthEachTime); copyToFile.Flush(); copyToFile.Position = fileToCopy.Position; copied += lengthToCopy; } int left = ( int )fileToCopy.Length - copied; //拷贝剩余部分 lengthToCopy = fileToCopy.Read(buffer, 0, left); fileToCopy.Flush(); copyToFile.Write(buffer, 0, left); copyToFile.Flush(); } else //如果整体拷贝,即每次拷贝内容大于文件总长度 { byte [] buffer = new byte [fileToCopy.Length]; fileToCopy.Read(buffer,0,( int )fileToCopy.Length); fileToCopy.Flush(); copyToFile.Write(buffer, 0, ( int )fileToCopy.Length); copyToFile.Flush(); } fileToCopy.Close(); copyToFile.Close(); } |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.cnblogs.com/yangxiaohu1/archive/2008/06/20/1226949.html