創建一個類或函數返回一個WebClient

Question

我使用WebClient通過我的代碼下載圖片是非常大的，所以我試圖將我的代碼分成類。有人能給我一個如何把下面的代碼放在類或函數中的例子嗎？

WebClient client = new WebClient(); 
client.DownloadDataCompleted += 
    (object sender, DownloadDataCompletedEventArgs e) => 
    { 
     byte[] result = e.Result; 
     if (result != null) 
     { 
      NSData data1 = NSData.FromArray (e.Result); 
      UIImage img = UIImage.LoadFromData (data1); 
      InvokeOnMainThread (delegate { 
       avatar.Image = img;  
      });    
     } 
    }; 

client.DownloadDataAsync(new Uri(
    "http://xx.xx.xx.xx/fbcache/" + 
    list[indexPath.Row].comentario_id_usuario + 
    ".jpg")); 

Answer 1

我想你可能會對什麼是類以及它的用途感到困惑。至於把該代碼放到一個函數，請嘗試以下上手（雖然我懷疑你將需要做一些關於你正在得到你想要的結果的異步調用）：

public WebClient MyFunctionName() 
{ 
     #region Baixando as imagens e as exibindo 
     WebClient client = new WebClient(); 
     client.DownloadDataCompleted += (object sender, DownloadDataCompletedEventArgs e) => { 
      byte[] result = e.Result; 
      if (result != null) { 
       NSData data1 = NSData.FromArray (e.Result); 
       UIImage img = UIImage.LoadFromData (data1); 
       InvokeOnMainThread (delegate { 
        avatar.Image = img; 


       }); 

      } 
     }; 
     client.DownloadDataAsync (new Uri ("http://xx.xx.xx.xx/fbcache/"+list [indexPath.Row].comentario_id_usuario+".jpg")); 
     #endregion 
     return client; 
}