上传文件到服务器及 下载到 客户端

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;

namespace Common
{
    public class WebFileUpDown
    {
        /// <summary>
        /// WebClient上传文件至服务器
        /// </summary>
        /// <param name="fileNamePath">文件名，全路径格式</param>
        /// <param name="uriString">服务器文件夹路径</param>
        /// <param name="IsAutoRename">是否自动按照时间重命名</param>
        public static void UpLoadFile(string fileNamePath, string NewName, string Weburl)
        {
            string fileName = fileNamePath.Substring(fileNamePath.LastIndexOf("\\") + 1);
            string NewFileName = NewName == "" ? fileName : NewName;

            string fileNameExt = fileName.Substring(fileName.LastIndexOf(".") + 1);
            if (Weburl.EndsWith("/") == false) Weburl = Weburl + "/";

            Weburl = Weburl + NewFileName;

            /**/
            /// 创建WebClient实例
            WebClient myWebClient = new WebClient();
            myWebClient.Credentials = System.Net.CredentialCache.DefaultCredentials;
            myWebClient.Credentials = CredentialCache.DefaultCredentials;

            // 要上传的文件

            FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);
            BinaryReader r = new BinaryReader(fs);
            byte[] postArray = r.ReadBytes((int)fs.Length);
            Stream postStream = myWebClient.OpenWrite(Weburl, "PUT");

            try
            {
                if (postStream.CanWrite)
                {
                    postStream.Write(postArray, 0, postArray.Length);
                    postStream.Close();
                    fs.Dispose();
                }
                else
                {
                    postStream.Close();
                    fs.Dispose();
                }
            }
            catch (Exception err)
            {
                postStream.Close();
                fs.Dispose();
                throw err;
            }
            finally
            {
                postStream.Close();
                fs.Dispose();
            }
        }

        /// <summary>
        /// 下载服务器文件至客户端
        /// </summary>
        /// <param name="URL">被下载的文件地址，绝对路径</param>
        /// <param name="Dir">另存放的目录</param>
        public static void Download(string URL, string Dir)
        {
            WebClient client = new WebClient();
            string fileName = URL.Substring(URL.LastIndexOf("/") + 1);  //被下载的文件名

            string Path = Dir;   //另存为的绝对路径＋文件名

            try
            {
                client.DownloadFile(URL, Path);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

    }
}