利用web services 上传、下载文件

//file.asmx

        /**//// <summary>
        /// 返回文件名列表数组
        /// </summary>
        /// <returns></returns>
        [WebMethod]
        public string[] GetFileName()
        {
            return  Directory.GetFiles(Server.MapPath("images"));
        }

        [WebMethod]
        public byte[] GetFileByte(string filePath)
        {
            try
            {    
                FileStream    inputFile;
                inputFile=File.Open(filePath,FileMode.Open,FileAccess.Read);
                long fileLength=inputFile.Length;
                byte[] dataBuffer=new Byte[fileLength];
                inputFile.Read(dataBuffer,0,(int)fileLength);
                inputFile.Close();
                return dataBuffer;            
            }
            catch (Exception ex)
            {
                throw(ex);
            }
        }

        /**//// <summary>
        ///  上传文件
        /// </summary>
        /// <returns></returns>
        [WebMethod]
        public Boolean UploadFile(byte[] fileSour,string fileName)
        {    
            try
            {
                FileStream outinputFile;
                outinputFile=File.Create(Server.MapPath("images").ToString() +"/" +fileName);
                outinputFile.Write(fileSour,0,fileSour.Length);
                outinputFile.Close();
                return true;
            }
            catch(Exception ex)
            {
                throw(ex);
            }
        }

//test.cs

        /**//// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new GetFile());
        }

        /**//// <summary>
        /// 加载数据
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void menuItem2_Click(object sender, System.EventArgs e)
        {
            try
            {
                this.Cursor=Cursors.WaitCursor;
                this.Enabled=false;
                this.statusBar1.Text="正在连接服务";
                localhostWeb.file sw=new localhostWeb.file();
                this.FileList.Visible=true;
                this.FileList.DataSource=sw.GetFileName();
                this.menuItem4.Enabled=true;
                this.statusBar1.Text="完成.";
            }
            catch
            {
                this.menuItem4.Enabled=false;
                this.statusBar1.Text="无法连接接服务，请确保网络通畅。";
            }
            finally
            {
                this.Cursor=Cursors.Default;
                this.Enabled=true;
            }
        }

        private void menuItem4_Click(object sender, System.EventArgs e)
        {
            this.saveFileDialog1.Filter="JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif";
            this.saveFileDialog1.Title="保存图片";
            this.saveFileDialog1.ShowDialog();
        }

        private void menuItem5_Click(object sender, System.EventArgs e)
        {
            openFileDialog1.ShowDialog();
        }

        private void openFileDialog1_FileOk(object sender, System.ComponentModel.CancelEventArgs e)
        {
            try
            {
                saveFilePath=this.openFileDialog1.FileName;
                if (saveFilePath.Length > 0)
                {
                    saveFilePath=saveFilePath.Substring((int)saveFilePath.LastIndexOf("\\") + 1);
                    this.Cursor=Cursors.WaitCursor;
                    this.Enabled=false;
                    FileStream openFile;
                    openFile=File.Open(saveFilePath,FileMode.Open,FileAccess.Read);    
                    long fileLength=openFile.Length;
                    byte[] fileByte=new byte[fileLength];
                    openFile.Read(fileByte,0,(int)fileLength);
                    localhostWeb.file sw=new localhostWeb.file();
                    if (sw.UploadFile(fileByte,saveFilePath)==true)
                    {
                        MessageBox.Show("上传文件成功！ ","上传文件",0,MessageBoxIcon.Information);
                    }
                }

            }
            catch(Exception ex)
            {
                MessageBox.Show("文件保存时出现错误：\n\r"+ex.Message+"！","保存文件失败",0,MessageBoxIcon.Stop);
            }
            finally
            {
                this.Cursor=Cursors.Default;
                this.Enabled=true;
            }
        }

        private void saveFileDialog1_FileOk(object sender, System.ComponentModel.CancelEventArgs e)
        {
            //保存文件到本地
            if (saveFileDialog1.FileName != "")
            {
                saveFilePath=saveFileDialog1.FileName;
                try
                {
                    this.Cursor=Cursors.WaitCursor;
                    this.Enabled=false;
                    localhostWeb.file sw=new localhostWeb.file();
                    byte[] imageFile;
                    FileStream outputFile;
                    imageFile=sw.GetFileByte(this.FileList.SelectedValue.ToString());
                    outputFile=File.Open(saveFilePath,FileMode.Create,FileAccess.Write);
                    outputFile.Write(imageFile,0,imageFile.Length);
                    outputFile.Close();
                    MessageBox.Show("文件保存成功！ ","保存文件",0,MessageBoxIcon.Information);
                }
                catch(Exception ex)
                {
                    MessageBox.Show("文件保存成功时出现错误：\n\r"+ex.Message+"！","保存文件失败",0,MessageBoxIcon.Stop);
                }
                finally
                {
                    this.Cursor=Cursors.Default;
                    this.Enabled=true;
                }
            }
        }