文件夹浏览对话框未显示文件夹 [英] Folder browse dialog not showing folders

问题描述

我创建了一个用.NET 3.5编译的应用程序.并使用了 FolderBrowserDialog对象.当按下按钮时，我执行以下代码:

I have created an application compiled with .NET 3.5. and used the FolderBrowserDialog object. When a button is pressed I execute this code:

FolderBrowserDialog fbd = new FolderBrowserDialog ();
fbd.ShowDialog();

显示了文件夹"对话框，但看不到任何文件夹.我唯一看到的是 确定和按钮是什么?取消(并在创建新文件夹按钮时 ShowNewFolderButton属性设置为true).当我尝试完全一样 以另一种形式编写代码，一切工作正常.

A Folder dialog is shown but I can't see any folders. The only thing I see are the buttons OK & Cancel (and create new folder button when the ShowNewFolderButton properyty is set to true). When I try the exact same code on a different form everything is working fine.

任何想法?

推荐答案

检查运行对话框的线程是否在STAThread上.因此，例如，确保您的Main方法带有[STAThread]属性标记:

Check that the thread running your dialog is on an STAThread. So for example make sure your Main method is marked with the [STAThread] attribute:

[STAThread]
static void Main() {
    Application.EnableVisualStyles();
    Application.SetCompatibleTextRenderingDefault(false);
    Application.Run(new Form1());
}

否则，您可以执行此操作(来自 FolderBrowserDialog类).

Otherwise you can do this (from the Community Content on FolderBrowserDialog Class).

/// <summary>
/// Gets the folder in Sta Thread
/// </summary>
/// <returns>The path to the selected folder or (if nothing selected) the empty value</returns>
private static string ChooseFolderHelper()
{
    var result = new StringBuilder();
    var thread = new Thread(obj =>
    {
        var builder = (StringBuilder)obj;
        using (var dialog = new FolderBrowserDialog())
        {
            dialog.Description = "Specify the directory";
            dialog.RootFolder = Environment.SpecialFolder.MyComputer;
            if (dialog.ShowDialog() == DialogResult.OK)
            {
                builder.Append(dialog.SelectedPath);
            }
         }
     });

     thread.SetApartmentState(ApartmentState.STA);
     thread.Start(result);

     while (thread.IsAlive)
     {
         Thread.Sleep(100);
      }

    return result.ToString();
}

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