本章节主要讲解HYAppFrame服务器端如何ASP.NET Web Service实现文件（含大文件）上传，WinForm客户端如何下载文件。
1服务器端文件上传1.1 上传文件
函数FileUpload(stringfileFullPath, byte[] file)用于上传文件，生成文件前检查文件路径所在文件夹是否存在，不存在则首先创建文件夹。
[WebMethod(EnableSession = true,Description = "上传文件")]public int FileUpload(string fileFullPath,byte[] file){ try{// 取得文件夹string dir = fileFullPath.Substring(0,fileFullPath.LastIndexOf("\\"));//如果不存在文件夹，就创建文件夹if (!Directory.Exists(dir))Directory.CreateDirectory(dir);// 写入文件File.WriteAllBytes(fileFullPath, file);return 1;} catch (Exception ex){MyFuncLib.Log(ex.Message + "\r\n" + ex.StackTrace);return -1;}}1.2 合并文件
经过实验通过Web Service上传文件，如果大小超过2M可能遇到上传失败的错误，所以客户端处理上传大文件时，先分割成小文件，逐一上传，然后再到服务器上合并成原始文件。
[WebMethod(EnableSession = true,Description = "合并文件")]public int FileMerge(string fileFullPath,int num){ try{int i = 0;FileStream fs = new FileStream(fileFullPath, FileMode.Create,FileAccess.Write);while (num >= 0){FileStream fsSource = new FileStream(fileFullPath + i, FileMode.Open,FileAccess.Read);Byte[] buffer = new Byte[fsSource.Length];fsSource.Read(buffer, 0, Convert.ToInt32(fsSource.Length));fs.Write(buffer, 0, buffer.Length);fsSource.Close();num–;i++;}fs.Close();// 删除临时文件while (i >= 0){File.Delete(fileFullPath + i);i–;}return 1;} catch (Exception ex){MyFuncLib.Log(ex.Message + "\r\n" + ex.StackTrace);return -1;}}1.3 删除文件
函数FileDelete(stringfileName)用于删除给定文件，删除前要检查用户是否通过身份验证，检查给定的文件路径是否包含特殊符号，例如，如果包含连续两个英文句号，使用者试图操作其他路径的文件。删除前，也要判断文件是否存在，删除后判断文件是否仍然存在，以此判断文件是否真正被删除。删除成功返回1，未删除任何文件返回0。
[WebMethod(EnableSession= true, Description = "删除指定文件")]publicint FileDelete(string fileName){try{if (!IsLogin())return -100;fileName = MyFuncLib.WebDir +DES.Decrypt(fileName,MyFuncLib.passwordKey);// 不允许路径指向其他目录if (fileName.IndexOf("..")> -1)return 0;// 如果是文件夹，就跳过，不允许删除文件夹if (Directory.Exists(fileName))return 0;// 如果文件存在删除指定文件if (File.Exists(fileName))File.Delete(fileName);if (File.Exists(fileName))return 0;elsereturn 1;}catch (Exception ex){MyFuncLib.Log(ex.Message +"\r\n" + ex.StackTrace);return -1;}}
2 客户端文件上传下载2.1 文件上传
上传文件，支持多选，依次处理每一个文件。当待处理文件大小超过1M时，对其进行分割，并依次上传，当全部文件分割完毕后在服务器上合并。当文件上传后，需将文件的名称、存储路径、大小、类型、关联记录id等属性存入数据库。
privatevoid UploadFile(){try{this.progressBarX1.Value = 0;this.progressBarX1.Minimum = 0;string dirName = SysParameters.WebDir +webDir;OpenFileDialog ofg = newOpenFileDialog();ofg.Title = "选择文件";ofg.Filter = "所有文件|*.*";ofg.FilterIndex = 1;ofg.RestoreDirectory = true;ofg.Multiselect = true;if (ofg.ShowDialog() ==DialogResult.OK){this.warningBox1.Text =string.Empty;foreach (string fileName inofg.FileNames){#region 逐一处理上传文件string newName =Guid.NewGuid().ToString() + MyFuncLib.getFileNameExt(fileName);using (FileStream fsSource =new FileStream(fileName, FileMode.Open, FileAccess.Read)){// Read the source file into a bytearray.long size =fsSource.Length;if (size < int.MaxValue)this.progressBarX1.Maximum = (int)size;elsethis.progressBarX1.Maximum = int.MaxValue – 1;int unit = 1024000;//如果文件体积小于1M，就一次性上传，如果文件大于1M就分割上传if (size <= unit){byte[] bytes = newbyte[size];int numBytesToRead =(int)size;int numBytesRead = 0;while (numBytesToRead> 0){// Read may returnanything from 0 to numBytesToRead.int n =fsSource.Read(bytes, numBytesRead, numBytesToRead);// Break when theend of the file is reached.if (n == 0)break;numBytesRead += n;numBytesToRead -=n;}numBytesToRead =bytes.Length;MyFuncLib.WS.FileUpload(dirName + newName, bytes);this.progressBarX1.Value =(int)size;}else{//倍数int multiple =(int)(size / unit);//余数int residue = (int)(size – multiple* unit);int i = 0;while (multiple > 0){byte[] bytes = newbyte[unit];int numBytesToRead= (int)unit;int numBytesRead =0;while(numBytesToRead > 0){// Read mayreturn anything from 0 to numBytesToRead.int n =fsSource.Read(bytes, numBytesRead, numBytesToRead);// Break whenthe end of the file is reached.if (n == 0)break;numBytesRead +=n;numBytesToRead-= n;}numBytesToRead =bytes.Length;MyFuncLib.WS.FileUpload(dirName + newName + i, bytes);multiple–;i++;this.progressBarX1.Value = i * unit;}if (residue > 0){byte[] bytes = newbyte[residue];int numBytesToRead= (int)residue;int numBytesRead =0;while(numBytesToRead > 0){// Read mayreturn anything from 0 to numBytesToRead.int n =fsSource.Read(bytes, numBytesRead, numBytesToRead);// Break whenthe end of the file is reached.if (n == 0)break;numBytesRead +=n;numBytesToRead-= n;}numBytesToRead =bytes.Length;MyFuncLib.WS.FileUpload(dirName + newName + i, bytes);}//在服务器上合并文件MyFuncLib.WS.FileMerge(dirName + newName, i);}this.progressBarX1.Value =0;//将成功上传的文件写入数据库if (this.cateName == null)this.cateName =string.Empty;string sql = "insertinto core_attachment() values()";ArrayList sqlParams = newArrayList();……MyFuncLib.DBCommandExecNoneQueryBySql(sql, sqlParams);this.warningBox1.Text ="“" + fileName + "”文件已上传";}#endregion}}}catch (Exception ex) {MyFuncLib.logToDB("error","系统错误", ex.Message, ex.StackTrace);MyFuncLib.msg("选择文件遇到错误，"+ ex.Message,"e");}}2.2 文件下载有一种旅行，叫单车旅行。它没有奢侈准备，
