代码重构，文件服务器机制优化，服务器端合并所有的高级文件服务器功能。

ClientsLibrary/AccountSupport/UserPortrait.cs

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+using CommonLibrary;
+using HslCommunication;
+using HslCommunication.BasicFramework;
+using HslCommunication.Enthernet;
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Windows.Forms;
+
+namespace ClientsLibrary
+{
+
+    /********************************************************************************
+     * 
+     *    时间：2017年9月17日 16:09:05
+     *    用户头像类，负责更换头像，下载头像，以及初始化登录操作
+     * 
+     *********************************************************************************/
+
+
+
+    /// <summary>
+    /// 头像管理类
+    /// </summary>
+    public class UserPortrait
+    {
+        #region Constructor
+        
+        /// <summary>
+        /// 实例化一个新的头像管理类对象
+        /// </summary>
+        /// <param name="filePath">头像存储的文件夹路径</param>
+        /// <param name="loadPic">加载图片的方法</param>
+        /// <param name="disPic">加载前的操作</param>
+        public UserPortrait(string filePath, Action<string> loadPic, Action disPic)
+        {
+            if (!System.IO.Directory.Exists(filePath))
+            {
+                System.IO.Directory.CreateDirectory(filePath);
+            }
+            FileSavePath = filePath;
+            LoadPic = loadPic;
+            DisPic = disPic;
+        }
+
+        #endregion
+        
+        #region Change Portrait
+
+        /// <summary>
+        /// 点击更改头像后的操作，打开头像选择对话框，获取到2种分辨率的头像，然后进行上传
+        /// </summary>
+        public void ChangePortrait()
+        {
+            using (FormPortraitSelect fps = new FormPortraitSelect())
+            {
+                if (fps.ShowDialog() == DialogResult.OK)
+                {
+                    string path300 = FileSavePath + @"\" + PortraitSupport.LargePortrait;
+                    string path32 = FileSavePath + @"\" + PortraitSupport.SmallPortrait;
+
+                    DisPic?.Invoke();
+
+                    Bitmap bitmap300 = fps.GetSpecifiedSizeImage(300);
+                    bitmap300.Save(path300);
+                    Bitmap bitmap32 = fps.GetSpecifiedSizeImage(32);
+                    bitmap32.Save(path32);
+                    //传送服务器
+                    bitmap300.Dispose();
+                    bitmap32.Dispose();
+
+                    using (FormFileOperate ffo = new FormFileOperate(
+                        UserClient.Net_File_Client, 
+                        new string[]
+                        {
+                            path300,
+                            path32
+                        }, "Files", "Portrait", UserClient.UserAccount.UserName))
+                    {
+                        ffo.ShowDialog();
+                    }
+                    DownloadUserPortraint();
+                }
+            }
+        }
+
+
+        #endregion
+
+        #region Download Portraint
+
+        /// <summary>
+        /// 加载头像信息，检查本地是否有相应的文件，没有则向服务器请求下载新的头像，然后加载，应放到线程池中执行
+        /// </summary>
+        public void DownloadUserPortraint()
+        {
+            string path = FileSavePath;
+            //获取服务器文件名称
+            OperateResultString result = UserClient.Net_simplify_client.ReadFromServer(CommonHeadCode.SimplifyHeadCode.请求小头, UserClient.UserAccount.UserName);
+            if (result.IsSuccess)
+            {
+                if (result.Content[0] == 'Y')
+                {
+                    //服务器存在头像
+                    string fileName = path + @"\" + PortraitSupport.SmallPortrait;
+                    string FileMd5 = result.Content.Substring(1);
+                    if (System.IO.File.Exists(fileName))
+                    {
+                        //文件文件
+                        string currentMd5 = SoftBasic.CalculateFileMD5(fileName);
+                        if (currentMd5 == FileMd5)
+                        {
+                            //加载本地头像
+                            LoadPic?.Invoke(fileName);
+                        }
+                        else
+                        {
+                            //头像已经换了
+                            DownloadUserPortraint(path);
+                        }
+                    }
+                    else
+                    {
+                        //客户端不存在头像
+                        DownloadUserPortraint(path);
+                    }
+                }
+                else
+                {
+                    //服务器不存在头像，本次加载结束
+                }
+            }
+        }
+
+        /// <summary>
+        /// 下载小尺寸的头像并使用委托加载它
+        /// </summary>
+        /// <param name="path"></param>
+        public void DownloadUserPortraint(string path)
+        {
+
+            OperateResultString result = UserClient.Net_simplify_client.ReadFromServer(CommonHeadCode.SimplifyHeadCode.下载小头, UserClient.UserAccount.UserName);
+            if (result.IsSuccess)
+            {
+                if (result.Content[0] == 'Y')
+                {
+                    byte[] data = Convert.FromBase64String(result.Content.Substring(1));
+                    string path32 = path + @"\" + PortraitSupport.SmallPortrait;
+                    System.IO.File.WriteAllBytes(path32, data);
+                    LoadPic?.Invoke(path32);
+                }
+            }
+        }
+
+        /// <summary>
+        /// 下载大尺寸的头像并打开它，该方法适合线程池
+        /// </summary>
+        public void ThreadPoolDownloadSizeLarge()
+        {
+            string path = FileSavePath;
+            string path300 = path + @"\" + PortraitSupport.LargePortrait;
+
+            // 利用客户端文件引擎去下载文件
+            OperateResult operateResult = UserClient.Net_File_Client.DownloadFile(
+                PortraitSupport.LargePortrait,
+                "Files",
+                "Portrait",
+                UserClient.UserAccount.UserName,
+                null,
+                path300
+                );
+
+
+            if(operateResult.IsSuccess)
+            {
+                System.Diagnostics.Process.Start(path300);
+            }
+
+            Thread.Sleep(1000);
+        }
+
+
+        #endregion
+
+        #region Public Method
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <returns></returns>
+        public string GetLargePortraitFileName()
+        {
+            return FileSavePath + @"\" + PortraitSupport.LargePortrait;
+        }
+
+        public string GetSmallPortraitFileName()
+        {
+            return FileSavePath + @"\" + PortraitSupport.SmallPortrait;
+        }
+
+        #endregion
+
+        #region Private Members
+
+        /// <summary>
+        /// 文件的路径
+        /// </summary>
+        private string FileSavePath { get; set; }
+        /// <summary>
+        /// 加载图片的操作
+        /// </summary>
+        private Action<string> LoadPic = null;
+        /// <summary>
+        /// 加载图片前的操作
+        /// </summary>
+        private Action DisPic = null;
+
+
+        #endregion
+    }
+}