控制檯應用程序無法下載文件？

開始編寫一個簡單的控制檯應用程序，將文件下載到當前位置。出於某種原因，無論文件有多大，我使用的WebClient只下載1kb的文件（不管多大）。我嘗試添加一個瀏覽器頭，我試着添加「while（WC.IsBusy）」（我發現，同時使用谷歌搜索的建議），我甚至嘗試添加一個錯誤處理程序到完成的處理程序，看看是什麼繼續，但會拋出「對象引用未設置爲對象的實例」。我在這裏拉我的頭髮，我希望有人能看到我不是的東西。控制檯應用程序無法下載文件？

這裏是我的代碼：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.IO; 
using System.Net; 
using System.Diagnostics; 
using System.Windows.Forms; 

namespace csgocfgmakerupdater 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 
      if (args.Length > 0) 
      { 
       instalwithargs(args); 
      } 
      else 
      { 
       installnoargs(); 
      } 
     } 

     static void installnoargs() 
     { 
      Console.Clear(); 
      Console.WriteLine("Current Folder: " + Directory.GetCurrentDirectory()); 
      Console.WriteLine(""); 
      Console.WriteLine("This will install the Counter-Strike: Global Offensive Config File Maker to your computer. Please select an option from the following:"); 
      Console.WriteLine(""); 
      Console.WriteLine("1. Install to Current Folder"); 
      Console.WriteLine("2. Install to Custom Folder"); 
      Console.WriteLine("3. Update Existing Installation in Current Folder"); 
      Console.WriteLine("4. Update Existing Installation in Custom Folder"); 
      Console.WriteLine("5. Exit"); 
      string installcmd = Console.ReadLine(); 
      switch (installcmd) 
      { 
       case "1": 
        try 
        { 
         string updurl = "http://cachefly.cachefly.net/100mb.test";//"http://elite.so/projects/cs-go-game-config-editor/CSGOCFGMKR.exe"; 
         WebClient WC = new WebClient(); 
         WC.DownloadProgressChanged += new DownloadProgressChangedEventHandler(WC_DownloadProgressChanged); 
         WC.DownloadFileCompleted += new System.ComponentModel.AsyncCompletedEventHandler(WC_DownloadFileCompleted); 
         WC.DownloadFileAsync(new Uri(updurl), "100mb.test"); 
//this waits for the webclient to exit 
while (WC.IsBusy) { 
Console.WriteLine("Downloading Updated files..."); 
} 
         Console.ReadKey(); 
        } 
        catch (Exception ex) 
        { 
         Console.Clear(); 
         Console.WriteLine(ex.Message); 
        } 
        break; 
      } 
     } 
     static void WC_DownloadFileCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e) 
     { 
      if (e.UserState != e.Error) 
      { 
       Console.Clear(); 
       Console.WriteLine("Update applied successfully!"); 
       Console.ReadKey(); 
       Environment.Exit(0); 
      } 
      else 
      { 
       MessageBox.Show(e.Error.Message); 
      } 
     } 

     static void WC_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e) 
     { 
      Console.Clear(); 
      Console.WriteLine("Downloading Updated files..."); 
      Console.WriteLine(progperc.ToString() + "%"); 
     } 
    } 
}

來源

2014-02-19 Ben H

「Console.ReadKey（）」行會發生什麼？你/用戶按了一個鍵，然後WebClient超出了範圍？ –

Web客戶端錯誤發生後，WC.DownloadFileAsync下方的Console.ReadKey（）會被觸發。它放在那裏，所以應用程序不會在每次出錯時關閉。 –

試試這個。僅供參考，您在此處使用和引用Windows窗體特定的命名空間。

using System; 
using System.IO; 
using System.Net; 

namespace csgocfgmakerupdater 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 
      if (args.Length > 0) 
      { 
      // instalwithargs(args); 
      } 
      else 
      { 
       installnoargs(); 
      } 
     } 

     static void installnoargs() 
     { 
      Console.Clear(); 
      Console.WriteLine("Current Folder: " + Directory.GetCurrentDirectory()); 
      Console.WriteLine(""); 
      Console.WriteLine("This will install the Counter-Strike: Global Offensive Config File Maker to your computer. Please select an option from the following:"); 
      Console.WriteLine(""); 
      Console.WriteLine("1. Install to Current Folder"); 
      Console.WriteLine("2. Install to Custom Folder"); 
      Console.WriteLine("3. Update Existing Installation in Current Folder"); 
      Console.WriteLine("4. Update Existing Installation in Custom Folder"); 
      Console.WriteLine("5. Exit"); 
      string installcmd = Console.ReadLine(); 
      switch (installcmd) 
      { 
       case "1": 
        try 
        { 
         string updurl = "http://elite.so/projects/cs-go-game-config-editor/CSGOCFGMKR.exe"; 
         WebClient WC = new WebClient(); 
         WC.DownloadProgressChanged += new DownloadProgressChangedEventHandler(WC_DownloadProgressChanged); 
         WC.DownloadFileCompleted += new System.ComponentModel.AsyncCompletedEventHandler(WC_DownloadFileCompleted); 
         WC.DownloadFileAsync(new Uri(updurl), "100mb.test"); 
         Console.ReadKey(); 
        } 
        catch (Exception ex) 
        { 
         Console.Clear(); 
         Console.WriteLine(ex.Message); 
        } 
        break; 
      } 
     } 
     static void WC_DownloadFileCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e) 
     { 
      if (e.UserState != e.Error) 
      { 
       Console.Clear(); 
       Console.WriteLine("Update applied successfully!"); 
       Console.ReadKey(); 
       Environment.Exit(0); 
      } 
      else 
      { 
      } 
     } 

     static void WC_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e) 
     { 
      Console.Clear(); 
      Console.WriteLine("Downloading Updated files..."); 
      Console.WriteLine(e.ProgressPercentage.ToString() + "%"); 
     } 
    } 
}

*迴應您的評論：下面是我修改的文件URL來檢查文件是否正確來的相同的代碼。這是7 + MB記事本+ +設置我試着作爲一個示例，它成功地下載了我的bin文件夾中的文件很像前面的例子。

using System; 
using System.IO; 
using System.Net; 

namespace csgocfgmakerupdater 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 
      if (args.Length > 0) 
      { 
       // instalwithargs(args); 
      } 
      else 
      { 
       installnoargs(); 
      } 
     } 

     static void installnoargs() 
     { 
      Console.Clear(); 
      Console.WriteLine("Current Folder: " + Directory.GetCurrentDirectory()); 
      Console.WriteLine(""); 
      Console.WriteLine("This will install the Counter-Strike: Global Offensive Config File Maker to your computer. Please select an option from the following:"); 
      Console.WriteLine(""); 
      Console.WriteLine("1. Install to Current Folder"); 
      Console.WriteLine("2. Install to Custom Folder"); 
      Console.WriteLine("3. Update Existing Installation in Current Folder"); 
      Console.WriteLine("4. Update Existing Installation in Custom Folder"); 
      Console.WriteLine("5. Exit"); 
      string installcmd = Console.ReadLine(); 
      switch (installcmd) 
      { 
       case "1": 
        try 
        { 
         //string updurl = "http://elite.so/projects/cs-go-game-config-editor/CSGOCFGMKR.exe"; 
         string updurl = "http://download.tuxfamily.org/notepadplus/6.5.4/npp.6.5.4.Installer.exe"; 
         WebClient WC = new WebClient(); 
         WC.DownloadProgressChanged += new DownloadProgressChangedEventHandler(WC_DownloadProgressChanged); 
         WC.DownloadFileCompleted += new System.ComponentModel.AsyncCompletedEventHandler(WC_DownloadFileCompleted); 
         WC.DownloadFileAsync(new Uri(updurl),"test.exe"); 
         Console.ReadKey(); 
        } 
        catch (Exception ex) 
        { 
         Console.Clear(); 
         Console.WriteLine(ex.Message); 
        } 
        break; 
      } 
     } 
     static void WC_DownloadFileCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e) 
     { 
      if (e.UserState != e.Error) 
      { 
       Console.Clear(); 
       Console.WriteLine("Update applied successfully!"); 
       Console.ReadKey(); 
       Environment.Exit(0); 
      } 
      else 
      { 
      } 
     } 

     static void WC_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e) 
     { 
      Console.Clear(); 
      Console.WriteLine("Downloading Updated files..."); 
      Console.WriteLine(e.ProgressPercentage.ToString() + "%"); 
     } 
    } 
}

來源

2014-02-19 17:28:38

「如果它對您有幫助，請標記爲答案。」不是答案的一部分。 – spender

我將在大約10分鐘內測試代碼。我現在在路上，我的編碼筆記本電腦在家裏。感謝上帝的RDP！ –

同樣的問題，下載1kb，然後命中錯誤（我似乎無法找到）。 –

你退出程序的下載終止異步之前。 WC.IsBusy解決方案似乎是合法的，也許您應該嘗試發佈該代碼。然後我們將看到如何解決這個問題。

而一個錯誤處理程序似乎是一個非常好的主意，你應該有一個以防萬一。

來源

2014-02-19 17:30:06 pid

我已將WC.IsBusy代碼添加到我的答案中 –

控制檯應用程序無法下載文件？

回答

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