C＃WinForms應用程序 - 調試錯誤 - 長度不能小於零。參數名稱：長度

Question

在調試模式下，在運行C＃WinForms應用程序時，我通過OpenFileDialog成功選擇了多個文件，然後將其顯示在日誌記錄窗口中，這些文件被複制到臨時目錄，我相信我會得到錯誤當試圖將excel文件轉換爲csv時。我得到以下運行時調試錯誤：

Error: You may not have permission to read the file or it may be corrupt. 
Reported Error: Length Can not be less than zero. 
Parameter Name: Length. 

如何解決此錯誤？

這是我在MainForm.cs

  // Consolidate Button Click Commands that executes if there are no user input errors 
    void ExecuteConsolidate() 
    { 
     string consolidatedFolder = targetFolderBrowserDialog.SelectedPath; 
     string tempfolder = targetFolderBrowserDialog.SelectedPath + "\\tempDirectory"; 
     string sFile = ""; 

     //create a temporary directory to store selected excel and csv files 
     if (!Directory.Exists(tempfolder)) 
     { 
      Directory.CreateDirectory(tempfolder); 
     }  
     try 
     { 
      for (int i = 0; i < listBoxSourceFiles.Items.Count; i++) 
      { 
       sFile = listBoxSourceFiles.Items[i].ToString(); 
       // Copy each selected xlsx files into the specified Temporary Folder 
       System.IO.File.Copy(textBoxSourceDir.Text + "\\" + sFile, tempfolder + @"\" + System.IO.Path.GetFileName(sFile), true); 
       Log("File " + sFile + " has been copied to " + tempfolder + @"\" + System.IO.Path.GetFileName(sFile));                   
      } // ends foreach  

      Process convertFilesProcess = new Process(); 
      // remove xlsx extension from filename so that we can add the .csv extension 
      string csvFileName = sourceFileOpenFileDialog.FileName.Substring(0, sourceFileOpenFileDialog.FileName.Length - 3); 

      // command prompt execution for converting xlsx files to csv 
      convertFilesProcess.StartInfo.WorkingDirectory = "I:\\CommissisionReconciliation\\App\\ConvertExcel\\"; 
      convertFilesProcess.StartInfo.FileName = "ConvertExcelTo.exe"; 
      convertFilesProcess.StartInfo.Arguments = "^" + targetFolderBrowserDialog.SelectedPath + "^" + csvFileName + ".csv"; 
      convertFilesProcess.StartInfo.UseShellExecute = true; 
      convertFilesProcess.StartInfo.CreateNoWindow = true; 
      convertFilesProcess.StartInfo.RedirectStandardOutput = true; 
      convertFilesProcess.StartInfo.RedirectStandardError = true; 
      convertFilesProcess.Start(); 

      //Process that creates all the xlsx files in temp folder to csv files. 
      Process consolidateFilesProcess = new Process(); 

      // command prompt execution for CSV File Consolidation 
      consolidateFilesProcess.StartInfo.WorkingDirectory = targetFolderBrowserDialog.SelectedPath; 
      consolidateFilesProcess.StartInfo.Arguments = "Copy *.csv ^" + csvFileName + ".csv"; 
      consolidateFilesProcess.StartInfo.UseShellExecute = false; 
      consolidateFilesProcess.StartInfo.CreateNoWindow = true; 
      consolidateFilesProcess.StartInfo.RedirectStandardOutput = true; 
      consolidateFilesProcess.StartInfo.RedirectStandardError = true; 
      consolidateFilesProcess.Start(); 

      Log("All Files at " + tempfolder + " has been converted to a csv file"); 
      Thread.Sleep(2000); 
      StreamReader sOut = consolidateFilesProcess.StandardOutput; 
      sOut.Close(); 

     } 
     catch (SecurityException ex) 
     { 
      // The user lacks appropriate permissions to read files, discover paths, etc. 
      MessageBox.Show("Security error. The user lacks appropriate permissions to read files, discover paths, etc. Please contact your administrator for details.\n\n" + 
      "Error message: " + ex.Message + "\n\n"); 
     } 
     catch (Exception ex) 
     { 
      // Could not load the image - probably related to Windows file system permissions. 
      MessageBox.Show("You may not have permission to read the file, or " + 
      "it may be corrupt.\n\nReported error: " + ex.Message); 
     } 
     try 
     {     
      if (Directory.Exists(tempfolder)) 
      { 
       Directory.Delete(tempfolder, true); 
      } 
     } 
     catch (SecurityException ex) 
     { 
      // The user lacks appropriate permissions to read files, discover paths, etc. 
      MessageBox.Show("Security error. The user lacks appropriate permissions to read files, discover paths, etc. Please contact your administrator for details.\n\n" + 
      "Error message: " + ex.Message + "\n\n"); 
     } 
     catch (Exception ex) 
     { 
      // Could not load the image - probably related to Windows file system permissions. 
      MessageBox.Show("You may not have permission to read the file, or " + 
      "it may be corrupt.\n\nReported error: " + ex.Message); 
     } 
     finally 
     { 
      // reset events 
      m_EventStopThread.Reset(); 
      m_EventThreadStopped.Reset(); 

      // create worker thread instance; 
      m_WorkerThread = new Thread(new ThreadStart(this.WorkerThreadFunction)); 
      m_WorkerThread.Start(); 
     } 
    } // ends void ExecuteConsolidate() 

感謝您尋找代碼！ :) 所有有用的答案將收到票！ :) 如果您需要更多信息，如workerThread方法或app.config代碼，請告訴我！

Answer 1

我想它死在這裏：

string csvFileName = sourceFileOpenFileDialog.FileName.Substring(0, 
      sourceFileOpenFileDialog.FileName.Length - 3); 

寫這樣，看看是否有幫助：

string selectedFile = sourceFileOpenFileDialog.FileName; 
string csvFileName = Path.Combine(Path.GetDirectoryName(selectedFile), 
      Path.GetFileNameWithoutExtension(selectedFile)); 

這是你行的翻譯。

但是我想，你真的想只是文件名不帶路徑：

string csvFileName = 
     Path.GetFileNameWithoutExtension(sourceFileOpenFileDialog.FileName); 

Answer 2

這是最有可能的此行，是造成你的問題：

string csvFileName = sourceFileOpenFileDialog.FileName.Substring(0, sourceFileOpenFileDialog.FileName.Length - 3); 

爲什麼不使用路徑。 GetFileNameWithoutExtension獲取沒有擴展名的文件名？

Answer 3

而且對所有錯誤打破：

• 轉到 「調試」 - >對公共語言運行時異常異常（或CTRL + ALT + E）

• 勾選 「時拋出」

• 一旦完成與你解決，不要忘記將其復位（復位所有按鈕）