文件的拷贝

 

/// <summary>
        /// 文件拷贝
        /// </summary>
        /// <param name="from"></param>
        /// <param name="to"></param>
        /// <param name="timelength"></param>
        public void FileCopy(string from,string to,int timelength)
        {
            FileStream fromfile = new FileStream(from, FileMode.Open, FileAccess.Read);
            FileStream tofile = new FileStream(to, FileMode.Create, FileAccess.Write);
            long length = fromfile.Length;
            if(length<timelength)
            {
                byte[] buff = new byte[length];
                fromfile.Read(buff, 0, (int)length);
                fromfile.Flush();
                tofile.Write(buff, 0, (int)length);
                tofile.Flush();
                label1.Text = "复制完成!";
                this.Refresh();
                fromfile.Dispose();
                tofile.Dispose();
            }
            else
            {
                long copied = 0;
                byte[] buff = new byte[timelength];
                while(copied<=length)
                {
                    fromfile.Read(buff, 0, timelength);
                    fromfile.Flush();
                    tofile.Write(buff, 0, timelength);
                    tofile.Flush();
                    label1.Text = "已复制: " + copied + "/" + length;
                    copied += timelength;
                    this.Refresh();
                }
                if(copied==length)
                {
                    label1.Text = "复制完成!";
                    this.Refresh();
                }else if(copied>length)
                {
                    int temp = (int)(timelength - (copied - length));
                    byte[] buf = new byte[temp];
                    fromfile.Read(buf, 0, temp);
                    fromfile.Flush();
                    tofile.Write(buf, 0, temp);
                    tofile.Flush();
                    label1.Text = "复制完成!";
                    this.Refresh();
                }

                fromfile.Dispose();
                tofile.Dispose();

            }
        }