C# FileStream复制大文件
人气:0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。
/// <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(); }
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