FolderBrowsingDialog不會打開下一個FolderBrowsingDialog

Question

FolderBrowsingDialog不會加載下一個。我單獨嘗試了f1和f2，並向我顯示桌面文件夾。但是當我嘗試f1 & f2在一起。只有F1負載

 public Form1() 
    { 
     InitializeComponent(); 

     FolderBrowserDialog f1 = new FolderBrowserDialog(); 
     FolderBrowserDialog f2 = new FolderBrowserDialog(); 

     f1.ShowNewFolderButton = true; 
     f2.ShowNewFolderButton = true; 

     f1.RootFolder = Environment.SpecialFolder.Desktop; 
     f2.RootFolder = Environment.SpecialFolder.Desktop; 

     //f1.Description = "Source"; 
     //f2.Description = "Destination"; 

     string folderPathCopy = string.Empty; 
     string folderPathPaste = string.Empty; 

     if (f1.ShowDialog() == DialogResult.OK) 
     { 
      folderPathCopy = f1.SelectedPath; 
     } 

     if (f2.ShowDialog() == DialogResult.OK)//Debugging stops here 
     { 
      folderPathPaste = f2.SelectedPath; 
     } 
    } 

的問題是，F2犯規運行。

Answer 1

移動代碼到 「中顯示」 事件：

 public Form1() 
     { 
     InitializeComponent(); 
     this.Shown += Form1_Shown; 

     } 

     private void Form1_Shown(object sender, EventArgs e) 
     { 
     FolderBrowserDialog f1 = new FolderBrowserDialog(); 
     FolderBrowserDialog f2 = new FolderBrowserDialog(); 

     f1.ShowNewFolderButton = true; 
     f2.ShowNewFolderButton = true; 

     f1.RootFolder = Environment.SpecialFolder.Desktop; 
     f2.RootFolder = Environment.SpecialFolder.Desktop; 

     //f1.Description = "Source"; 
     //f2.Description = "Destination"; 

     string folderPathCopy = string.Empty; 
     string folderPathPaste = string.Empty; 

     if (f1.ShowDialog() == DialogResult.OK) 
     { 
      folderPathCopy = f1.SelectedPath; 
     } 

     if (f2.ShowDialog() == DialogResult.OK)//Debugging stops here 
     { 
      folderPathPaste = f2.SelectedPath; 
     } 
     }