webclient 和httpclient 應用

//webclient應用
 MyImageServerEntities db = new MyImageServerEntities();
        public ActionResult Index()
        {
            return View();
        }
        public ActionResult FileUpload()
        {
            HttpPostedFileBase file = Request.Files["fileUp"];
            string fileName = Path.GetFileName(file.FileName);
            string fileExt = Path.GetExtension(fileName);
            if (fileExt == ".jpg")
            {
              var list=db.ImageServerInfo.Where<ImageServerInfo>(u => u.FlgUsable == true).ToList();//找出可用的圖片服務器.
              int count = list.Count();
              Random random = new Random();
              int r = random.Next();
              int i = r % count;
              string serverUrl = list[i].ServerUrl;
              int serverId = list[i].ServerId;
              string url = "http://"+serverUrl+"/FileUp.ashx?serverId="+serverId+"&fileExt="+fileExt;
              WebClient webClient =new WebClient();
              webClient.UploadData(url, StreamToBytes(file.InputStream));

            }
            return Content("ok");

        }
        public ActionResult ShowImage()
        {
          var list=  db.ImageServerInfo.Where<ImageServerInfo>(c=>c.FlgUsable==true).ToList();
          ViewData["imageServerList"] = list;
          return View();
        }
        private byte[] StreamToBytes(Stream stream)
        {
            byte[]buffer=new byte[stream.Length];
            stream.Read(buffer, 0, buffer.Length);
            stream.Seek(0, SeekOrigin.Begin);
            return buffer;
        }

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context.Response.ContentType = "text/plain" ;   int serverId = int .Parse(context.Request[ "serverId" ]);   string fileExt = context.Request[ "fileExt" ];   string dir = "/ImagePath/" + DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/" ;   Directory.CreateDirectory(Path.GetDirectoryName(context.Request.MapPath(dir)));   string newfileName = Guid.NewGuid().ToString();   string fullDir = dir + newfileName + fileExt;   using (FileStream fileStream = File.Open(context.Request.MapPath(fullDir), FileMode.OpenOrCreate))   {       context.Request.InputStream.CopyTo(fileStream);       MyImageServerEntities db = new MyImageServerEntities();       ImageInfo imageInfo = new ImageInfo();       imageInfo.ImageName = fullDir;       imageInfo.ImageServerId = serverId;       db.ImageInfo.Add(imageInfo);       db.SaveChanges();     }

　　

 

//httpclient 應用

創建並初始化對象：
    client.BaseAddress = new Uri(url);
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

讀集合：
    HttpResponseMessage response = client.GetAsync(url).Result;
     var userList = response.Content.ReadAsAsync<IEnumerable<數據類型>>().Result;

根據編號讀對象
    HttpResponseMessage response1 = client.GetAsync(url).Result;
    var userInfo = response1.Content.ReadAsAsync<數據類型>().Result;

增加：
    HttpResponseMessage response = client.PostAsJsonAsync("api/userinfo", userInfo).Result;
    使用response.IsSuccessStatusCode判斷是否成功
    使用response.Content.ToString()獲取返回值

修改：
     HttpResponseMessage response = client.PutAsJsonAsync("api/userinfo/"+userInfo.UserId, userInfo).Result;
    使用response.IsSuccessStatusCode判斷是否成功
    使用response.Content.ToString()獲取返回值

刪除：
    HttpResponseMessage response = client.DeleteAsync("api/userinfo/" + uid).Result;
    使用response.IsSuccessStatusCode判斷是否成功
    使用response.Content.ToString()獲取返回值