ASP.NET 文件上传的实现（Upload）

 NameValueCollection nvf = HttpContext.Current.Request.Form;
            if (!Request.Content.IsMimeMultipartContent())
            {
                throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
            }
            string tempPath = "/Upload/" + DateTime.Now.ToString("yyyy-MM-dd/");
            string fileSaveLocation = HttpContext.Current.Server.MapPath("~" + tempPath);//附件的保存地址
            Dictionary<string, object> dic = new Dictionary<string, object>();
            if (!Directory.Exists(fileSaveLocation))
            {
                Directory.CreateDirectory(fileSaveLocation);
            }
            CustomMultipartFormDataStreamProvider provider = new CustomMultipartFormDataStreamProvider(fileSaveLocation);
            try
            {
                var result = await Request.Content.ReadAsMultipartAsync(provider).ContinueWith<Dictionary<string, object>>(x =>
                {
                    var file = provider.FileData[0];
                    FileInfo fileinfo = new FileInfo(file.LocalFileName);
                    if (fileinfo.Length <= 0)
                    {
                        dic.Add("result", -1);
                        dic.Add("resultdetail", "未上传文件");
                    }
                    else
                    {
                        double? filelength = fileinfo.Length / 1024.0;
                        if (filelength > 10 * 1024)
                        {
                            dic.Add("result", -1);
                            dic.Add("resultdetail", "上传文件不能大于10M");
                        }
                        else
                        {
                            string saveFileName = Guid.NewGuid().ToString() + fileinfo.Extension;
                            fileinfo.CopyTo(Path.Combine(fileSaveLocation, saveFileName), true);
                            fileinfo.Delete();
                            dic.Add("result", 1);
                            dic.Add("resultdetail", "上传成功");
                            dic.Add("realPath", file.LocalFileName);//附件保存的绝对路径
                            dic.Add("attachmentType", fileinfo.Extension);//附件类型
                            dic.Add("attachmentName", Path.GetFileName(file.LocalFileName));//上传的附件名
                            dic.Add("attachSize", Convert.ToInt32(filelength));//附件大小KB
                            dic.Add("aealPath", tempPath + saveFileName);//附件保存相对路径
                        }
                    }
                    return dic;
                }, TaskScheduler.FromCurrentSynchronizationContext());
            }
            catch (Exception ex)
            {
                return HandleJson.ToJson(ex.ToString(), false);
            }
            var isSuccess = dic["result"].TryToInt() == 1;
            var msg = dic["resultdetail"].TryToString();//返回上传信息
            var realPath = string.Empty;//附件保存的绝对路径
            var relativePath = string.Empty;//返回相对路径
            var AttachSize = 0;//文件大小kB
            var AttachmentType = string.Empty;//文件扩展名
            var AttachmentName = string.Empty;//原文件名
            if (isSuccess)
            {
                realPath = dic["realPath"].TryToString();
                relativePath = dic["aealPath"].TryToString();
                AttachSize = dic["attachSize"].TryToInt();
                AttachmentType = dic["attachmentType"].TryToString();
                AttachmentName = dic["attachmentName"].TryToString();
            }

            StringBuilder sql = new StringBuilder();
            if (isSuccess)
            {
                try
                {
                    #region 获取图标路径

                    var ICOPath = string.Empty;
                    sql.Append(@"SELECT * FROM dbo.AttachmentType(NOLOCK) WHERE AttachmentType=@AttachmentType");
                    var ICOTable = Common.HandleSQL.GetData(sql.ToString(), null, new SqlParameter[] { new SqlParameter("@AttachmentType", AttachmentType) });
                    if (ICOTable.Rows.Count <= 0)
                    {
                        ICOPath = "";
                    }
                    else
                    {
                        ICOPath = ICOTable.Rows[0]["AttachmentNameTypeICO"].ToString();
                    }

                    #endregion 获取图标路径

                    #region 保存上传记录

                    sql.Clear();
                    sql.Append(@"DECLARE @ID INT
SELECT @ID=MAX(ID)+1 FROM dbo.Attachment(NOLOCK)
IF(@ID IS NULL)
BEGIN
SET @ID=1
END
INSERT INTO dbo.Attachment
        ( ID ,
          AttachmentName ,
          AttachmentType ,
          RealPath ,
          AttachSize ,
          UpLoadDate ,
          UpLoadPerson ,
          UpLoadIPAddress
        )
VALUES  ( @ID , -- ID - int
          @AttachmentName , -- AttachmentName - nvarchar(max)
          @AttachmentType , -- AttachmentType - nvarchar(50)
          @RealPath , -- RealPath - nvarchar(max)
          @AttachSize , -- AttachSize - bigint
          GETDATE() , -- UpLoadDate - datetime
          @UpLoadPerson , -- UpLoadPerson - nvarchar(50)
          @UpLoadIPAddress  -- UpLoadIPAddress - varchar(50)
        )
SELECT * FROM dbo.Attachment(NOLOCK) WHERE ID=@ID;
");
                    SqlParameter[] paras = new SqlParameter[] { new SqlParameter("@AttachmentName", AttachmentName),
                    new SqlParameter("@AttachSize", AttachSize), new SqlParameter("@RealPath", relativePath),
                    new SqlParameter("@AttachmentType", AttachmentType),new SqlParameter("@UpLoadPerson","魏小伟"),new SqlParameter("@UpLoadIPAddress",HandleLog.getIPAddress()) };
                    var insert = GetData(sql.ToString(), null, paras);
                    insert.Columns.Add("AttachmentNameTypeICO", typeof(string));
                    insert.Rows[0]["AttachmentNameTypeICO"] = ICOPath;
                    int ID = Convert.ToInt32(insert.Rows[0]["ID"].ToString());//上传附件的ID
                    return HandleJson.ToJson(insert, 0);

                    #endregion 保存上传记录
                }
                catch (Exception ex)
                {
                    if (System.IO.File.Exists(realPath))
                    {
                        File.Delete(realPath);
                    }
                    return HandleJson.ToJson(ex.ToString(), false);
                }
            }
            else
            {
                return HandleJson.ToJson(msg, false);
            }