ASP.NET文件上传Upload的实现方法

(编辑：jimmy 日期: 2024/5/31 浏览：3 次 )
本文实例为大家分享了ASP.NET 文件上传，供大家参考，具体内容如下
1、最近应项目开发的需求要实现附件的异步上传和下载。
2、上传：文件上传到指定的路径下，并返回上传文件的信息给前端界面，如:文件的图标、上传的文件名、文件的大小。
3、上传后，在前端界面上显示上传的文件信息，点击文件名实现将上传的文件下载到本地。
4、先展示一下Demo运行的效果图：
点击提交后：
点击文件名实现下载到本地：
5、下面就给出前台代码：
<!DOCTYPE html>
<html>
<head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>Ajax Form - jQuery EasyUI Demo</title>
 <link rel="stylesheet" type="text/css" href="http://www.jeasyui.com/easyui/themes/default/easyui.css">
 <link rel="stylesheet" type="text/css" href="http://www.jeasyui.com/easyui/themes/icon.css">
 <link rel="stylesheet" type="text/css" href="http://www.jeasyui.com/easyui/demo/demo.css">
 <script type="text/javascript" src="/UploadFiles/2021-04-02/jquery-1.6.1.min.js">

6、后台上传代码：


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"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);
  }




7、下载代码：


[HttpGet, Route("api/Loding/DownLoad")]
 public HttpResponseMessage DownLoad()
 {
  #region 获取界面参数

  NameValueCollection nvc = HttpContext.Current.Request.QueryString;
  int ID = nvc["ID"].TryToInt();
  if (ID <= 0)
  {
  return HandleJson.ToJson("传入参数错误", false);
  }

  #endregion 获取界面参数

  #region SQL

  StringBuilder sql = new StringBuilder();
  sql.Append(@"SELECT * FROM dbo.Attachment(NOLOCK) WHERE ID=@ID ");

  #endregion SQL

  #region 执行SQL

  var dt = HandleSQL.GetData(sql.ToString(), null, new SqlParameter[] { new SqlParameter("@ID", ID) });
  if (dt.Rows.Count <= 0)
  {
  return HandleJson.ToJson("未找到下载文件", false);
  }
  var filePath = HttpContext.Current.Server.MapPath("~" + dt.Rows[0]["RealPath"].TryToString());//下载文件的绝对路径
  string fileName = dt.Rows[0]["AttachmentName"].TryToString();//下载的文件名

  #endregion 执行SQL

  #region 下载文件并添加下载记录

  try
  {
  //var FilePath = System.Web.Hosting.HostingEnvironment.MapPath(@"~/download/" + fileName);
  var stream = new FileStream(filePath, FileMode.Open);
  HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
  response.Content = new StreamContent(stream);
  response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
  response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
  {
   FileName = fileName
  };

  #region 添加下载记录

  sql.Clear();
  SqlParameter[] paras = new SqlParameter[] { new SqlParameter("@ID", ID), new SqlParameter("@DownLoadPerson", "魏小伟"), new SqlParameter("@DownLoadIP", HandleLog.getIPAddress()) };
  sql.Append(@"DECLARE @AutoID INT
SELECT @AutoID=MAX(AutoID)+1 FROM dbo.AttachmentDowLoadLog(NOLOCK)
IF(@AutoID IS NULL)
BEGIN
SET @AutoID=1
END
INSERT INTO dbo.AttachmentDowLoadLog
 ( AutoID ,
  ID ,
  DownLoadPerson ,
  DownLoadDate ,
  DownLoadIP
 )
VALUES ( @AutoID , -- AutoID - int
  @ID , -- ID - int
  @DownLoadPerson , -- DownLoadPerson - nvarchar(max)
  GETDATE() , -- DownLoadDate - datetime
  @DownLoadIP -- DownLoadIP - nvarchar(50)
 );");
  execSQL(sql.ToString(), null, paras);

  #endregion 添加下载记录

  return response;
  }
  catch
  {
  return new HttpResponseMessage(HttpStatusCode.NoContent);
  }

  #endregion 下载文件并添加下载记录
 }





8、以上只是我个人的一个小Demo，有不对或需要改进的地方还请大家多多提点！
精彩专题分享：ASP.NET文件上传汇总 
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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