webclient 和httpclient 应用

//webclient应用
 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();//找出可用的图片服务器.
              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;
        }

 
         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 应用

创建并初始化对象：
    client.BaseAddress = new Uri(url);
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

读集合：
    HttpResponseMessage response = client.GetAsync(url).Result;
     var userList = response.Content.ReadAsAsync<IEnumerable<数据类型>>().Result;

根据编号读对象
    HttpResponseMessage response1 = client.GetAsync(url).Result;
    var userInfo = response1.Content.ReadAsAsync<数据类型>().Result;

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

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

删除：
    HttpResponseMessage response = client.DeleteAsync("api/userinfo/" + uid).Result;
    使用response.IsSuccessStatusCode判断是否成功
    使用response.Content.ToString()获取返回值

webclient 和httpclient 应用

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