C# WinForm 文件上传下载源码

 

     /**/ /// 

        /// WebClient上传文件至服务器
        /// 

        /// 文件名，全路径格式
        /// 服务器文件夹路径
        /// 是否需要修改文件名，这里默认是日期格式
        /// 
         public   static   bool  UploadFile( string  localFilePath,  string  serverFolder, bool  reName)
         ... {
            string fileNameExt, newFileName, uriString;
            if (reName)
            ...{
                fileNameExt = localFilePath.Substring(localFilePath.LastIndexOf(".") + 1);
                newFileName = DateTime.Now.ToString("yyMMddhhmmss") + fileNameExt;
            }
            else
            ...{
                newFileName = localFilePath.Substring(localFilePath.LastIndexOf("/")+1);
            } 
            if (!serverFolder.EndsWith("/") && !serverFolder.EndsWith("/"))
            ...{
                serverFolder = serverFolder + "/";
            }

            uriString = serverFolder + newFileName;   //服务器保存路径
            /**//// 创建WebClient实例
            WebClient myWebClient = new WebClient();
            myWebClient.Credentials = CredentialCache.DefaultCredentials;

            // 要上传的文件
            FileStream fs = new FileStream(newFileName, FileMode.Open, FileAccess.Read);
            BinaryReader r = new BinaryReader(fs);
            try
            ...{
                //使用UploadFile方法可以用下面的格式
                //myWebClient.UploadFile(uriString,"PUT",localFilePath);
                byte[] postArray = r.ReadBytes((int)fs.Length);
                Stream postStream = myWebClient.OpenWrite(uriString, "PUT");
                if (postStream.CanWrite)
                ...{
                    postStream.Write(postArray, 0, postArray.Length);
                }
                else
                ...{
                    MessageBox.Show("文件目前不可写！");
                }
                postStream.Close();
            }
            catch
            ...{
                //MessageBox.Show("文件上传失败，请稍候重试~");
                return false;
            }

            return true;
        }
      

         /**/ /// 

        /// 下载服务器文件至客户端
        /// 

        /// 被下载的文件地址
        /// 另存放的目录
         public   static   bool  Download( string  uri,  string  savePath)
         ... {
            string fileName;  //被下载的文件名
            if (uri.IndexOf("/") > -1)
            ...{
                fileName = uri.Substring(uri.LastIndexOf("/") + 1);
            }
            else
            ...{
                fileName = uri.Substring(uri.LastIndexOf("/") + 1);  
            }


            if (!savePath.EndsWith("/") && !savePath.EndsWith("/"))
            ...{
                savePath = savePath + "/";
            }

            savePath += fileName;   //另存为的绝对路径＋文件名

            WebClient client = new WebClient();
            try
            ...{
                client.DownloadFile(uri, savePath);
            }
            catch
            ...{
                return false;
            }

            return true;
        }  


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命名空间
System.Net;
System.IO;
上传IIS虚拟目录需要给写入权限，下载可能需要匿名访问权限。