如何使用 OpenFileDialog 选择文件夹？

Question

如何使用OpenFileDialog选择文件夹？

我打算使用以下项目：https://github.com/scottwis/OpenFileOrFolderDialog

但是，我遇到了一个问题。它使用GetOpenFileName 函数和OPENFILENAME 结构。而OPENFILENAME 有一个名为templateID 的成员。它是对话框模板的标识符。该项目还包含res1.rc 文件和模板化对话框初始化。但我不知道如何将此文件附加到我的 C# 项目中。

有没有更好的方法来使用OpenFileDialog 来选择文件夹？

Answer 1

这是一个纯 C# 版本，无 nuget，应该适用于所有版本的 .NET（包括 .NET Core、.NET 5、WPF、Winforms 等）并使用 Windows Vista（及更高版本）@987654321 @ 带有FOS_PICKFOLDERS 选项的接口，因此它具有漂亮的文件夹选择器 Windows 标准 UI。

我还添加了 WPF 的 Window 类型支持，但这是可选的，可以删除 WPF 标记的行。

用法：

var dlg = new FolderPicker();
dlg.InputPath = @"c:\windows\system32";
if (dlg.ShowDialog() == true)
{
    MessageBox.Show(dlg.ResultPath);
}

代码：

    using System;
    using System.Diagnostics;
    using System.Runtime.InteropServices;
    using System.Runtime.InteropServices.ComTypes;
    using System.Windows; // for WPF support
    using System.Windows.Interop;  // for WPF support

    public class FolderPicker
    {
        public virtual string ResultPath { get; protected set; }
        public virtual string ResultName { get; protected set; }
        public virtual string InputPath { get; set; }
        public virtual bool ForceFileSystem { get; set; }
        public virtual string Title { get; set; }
        public virtual string OkButtonLabel { get; set; }
        public virtual string FileNameLabel { get; set; }

        protected virtual int SetOptions(int options)
        {
            if (ForceFileSystem)
            {
                options |= (int)FOS.FOS_FORCEFILESYSTEM;
            }
            return options;
        }

        // for WPF support
        public bool? ShowDialog(Window owner = null, bool throwOnError = false)
        {
            owner ??= Application.Current.MainWindow;
            return ShowDialog(owner != null ? new WindowInteropHelper(owner).Handle : IntPtr.Zero, throwOnError);
        }

        // for all .NET
        public virtual bool? ShowDialog(IntPtr owner, bool throwOnError = false)
        {
            var dialog = (IFileOpenDialog)new FileOpenDialog();
            if (!string.IsNullOrEmpty(InputPath))
            {
                if (CheckHr(SHCreateItemFromParsingName(InputPath, null, typeof(IShellItem).GUID, out var item), throwOnError) != 0)
                    return null;

                dialog.SetFolder(item);
            }

            var options = FOS.FOS_PICKFOLDERS;
            options = (FOS)SetOptions((int)options);
            dialog.SetOptions(options);

            if (Title != null)
            {
                dialog.SetTitle(Title);
            }

            if (OkButtonLabel != null)
            {
                dialog.SetOkButtonLabel(OkButtonLabel);
            }

            if (FileNameLabel != null)
            {
                dialog.SetFileName(FileNameLabel);
            }

            if (owner == IntPtr.Zero)
            {
                owner = Process.GetCurrentProcess().MainWindowHandle;
                if (owner == IntPtr.Zero)
                {
                    owner = GetDesktopWindow();
                }
            }

            var hr = dialog.Show(owner);
            if (hr == ERROR_CANCELLED)
                return null;

            if (CheckHr(hr, throwOnError) != 0)
                return null;

            if (CheckHr(dialog.GetResult(out var result), throwOnError) != 0)
                return null;

            if (CheckHr(result.GetDisplayName(SIGDN.SIGDN_DESKTOPABSOLUTEPARSING, out var path), throwOnError) != 0)
                return null;

            ResultPath = path;

            if (CheckHr(result.GetDisplayName(SIGDN.SIGDN_DESKTOPABSOLUTEEDITING, out path), false) == 0)
            {
                ResultName = path;
            }
            return true;
        }

        private static int CheckHr(int hr, bool throwOnError)
        {
            if (hr != 0)
            {
                if (throwOnError)
                    Marshal.ThrowExceptionForHR(hr);
            }
            return hr;
        }

        [DllImport("shell32")]
        private static extern int SHCreateItemFromParsingName([MarshalAs(UnmanagedType.LPWStr)] string pszPath, IBindCtx pbc, [MarshalAs(UnmanagedType.LPStruct)] Guid riid, out IShellItem ppv);

        [DllImport("user32")]
        private static extern IntPtr GetDesktopWindow();

#pragma warning disable IDE1006 // Naming Styles
        private const int ERROR_CANCELLED = unchecked((int)0x800704C7);
#pragma warning restore IDE1006 // Naming Styles

        [ComImport, Guid("DC1C5A9C-E88A-4dde-A5A1-60F82A20AEF7")] // CLSID_FileOpenDialog
        private class FileOpenDialog
        {
        }

        [ComImport, Guid("42f85136-db7e-439c-85f1-e4075d135fc8"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
        private interface IFileOpenDialog
        {
            [PreserveSig] int Show(IntPtr parent); // IModalWindow
            [PreserveSig] int SetFileTypes();  // not fully defined
            [PreserveSig] int SetFileTypeIndex(int iFileType);
            [PreserveSig] int GetFileTypeIndex(out int piFileType);
            [PreserveSig] int Advise(); // not fully defined
            [PreserveSig] int Unadvise();
            [PreserveSig] int SetOptions(FOS fos);
            [PreserveSig] int GetOptions(out FOS pfos);
            [PreserveSig] int SetDefaultFolder(IShellItem psi);
            [PreserveSig] int SetFolder(IShellItem psi);
            [PreserveSig] int GetFolder(out IShellItem ppsi);
            [PreserveSig] int GetCurrentSelection(out IShellItem ppsi);
            [PreserveSig] int SetFileName([MarshalAs(UnmanagedType.LPWStr)] string pszName);
            [PreserveSig] int GetFileName([MarshalAs(UnmanagedType.LPWStr)] out string pszName);
            [PreserveSig] int SetTitle([MarshalAs(UnmanagedType.LPWStr)] string pszTitle);
            [PreserveSig] int SetOkButtonLabel([MarshalAs(UnmanagedType.LPWStr)] string pszText);
            [PreserveSig] int SetFileNameLabel([MarshalAs(UnmanagedType.LPWStr)] string pszLabel);
            [PreserveSig] int GetResult(out IShellItem ppsi);
            [PreserveSig] int AddPlace(IShellItem psi, int alignment);
            [PreserveSig] int SetDefaultExtension([MarshalAs(UnmanagedType.LPWStr)] string pszDefaultExtension);
            [PreserveSig] int Close(int hr);
            [PreserveSig] int SetClientGuid();  // not fully defined
            [PreserveSig] int ClearClientData();
            [PreserveSig] int SetFilter([MarshalAs(UnmanagedType.IUnknown)] object pFilter);
            [PreserveSig] int GetResults([MarshalAs(UnmanagedType.IUnknown)] out object ppenum);
            [PreserveSig] int GetSelectedItems([MarshalAs(UnmanagedType.IUnknown)] out object ppsai);
        }

        [ComImport, Guid("43826D1E-E718-42EE-BC55-A1E261C37BFE"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
        private interface IShellItem
        {
            [PreserveSig] int BindToHandler(); // not fully defined
            [PreserveSig] int GetParent(); // not fully defined
            [PreserveSig] int GetDisplayName(SIGDN sigdnName, [MarshalAs(UnmanagedType.LPWStr)] out string ppszName);
            [PreserveSig] int GetAttributes();  // not fully defined
            [PreserveSig] int Compare();  // not fully defined
        }

        #pragma warning disable CA1712 // Do not prefix enum values with type name
        private enum SIGDN : uint
        {
            SIGDN_DESKTOPABSOLUTEEDITING = 0x8004c000,
            SIGDN_DESKTOPABSOLUTEPARSING = 0x80028000,
            SIGDN_FILESYSPATH = 0x80058000,
            SIGDN_NORMALDISPLAY = 0,
            SIGDN_PARENTRELATIVE = 0x80080001,
            SIGDN_PARENTRELATIVEEDITING = 0x80031001,
            SIGDN_PARENTRELATIVEFORADDRESSBAR = 0x8007c001,
            SIGDN_PARENTRELATIVEPARSING = 0x80018001,
            SIGDN_URL = 0x80068000
        }

        [Flags]
        private enum FOS
        {
            FOS_OVERWRITEPROMPT = 0x2,
            FOS_STRICTFILETYPES = 0x4,
            FOS_NOCHANGEDIR = 0x8,
            FOS_PICKFOLDERS = 0x20,
            FOS_FORCEFILESYSTEM = 0x40,
            FOS_ALLNONSTORAGEITEMS = 0x80,
            FOS_NOVALIDATE = 0x100,
            FOS_ALLOWMULTISELECT = 0x200,
            FOS_PATHMUSTEXIST = 0x800,
            FOS_FILEMUSTEXIST = 0x1000,
            FOS_CREATEPROMPT = 0x2000,
            FOS_SHAREAWARE = 0x4000,
            FOS_NOREADONLYRETURN = 0x8000,
            FOS_NOTESTFILECREATE = 0x10000,
            FOS_HIDEMRUPLACES = 0x20000,
            FOS_HIDEPINNEDPLACES = 0x40000,
            FOS_NODEREFERENCELINKS = 0x100000,
            FOS_OKBUTTONNEEDSINTERACTION = 0x200000,
            FOS_DONTADDTORECENT = 0x2000000,
            FOS_FORCESHOWHIDDEN = 0x10000000,
            FOS_DEFAULTNOMINIMODE = 0x20000000,
            FOS_FORCEPREVIEWPANEON = 0x40000000,
            FOS_SUPPORTSTREAMABLEITEMS = unchecked((int)0x80000000)
        }
        #pragma warning restore CA1712 // Do not prefix enum values with type name
    }

结果：

Answer 2

奇怪这么多答案/投票，但没有人添加以下代码作为答案：

using (var opnDlg = new OpenFileDialog()) //ANY dialog
{ 
    //opnDlg.Filter = "Png Files (*.png)|*.png";
    //opnDlg.Filter = "Excel Files (*.xls, *.xlsx)|*.xls;*.xlsx|CSV Files (*.csv)|*.csv"

    if (opnDlg.ShowDialog() == DialogResult.OK)
    {
        //opnDlg.SelectedPath -- your result
    }
}

Answer 3

作为对希望避免使用FolderBrowserDialog 的未来用户的说明，Microsoft 曾经发布了一个名为 WindowsAPICodePack 的 API，该 API 有一个名为 CommonOpenFileDialog 的有用对话框，可以设置为 IsFolderPicker 模式。该 API 可从 Microsoft 以NuGet package 的形式获得。

这就是我安装和使用CommonOpenFileDialog 所需的全部内容。 （NuGet 处理依赖关系）

Install-Package Microsoft.WindowsAPICodePack-Shell

对于包含行：

using Microsoft.WindowsAPICodePack.Dialogs;

用法：

CommonOpenFileDialog dialog = new CommonOpenFileDialog();
dialog.InitialDirectory = "C:\\Users";
dialog.IsFolderPicker = true;
if (dialog.ShowDialog() == CommonFileDialogResult.Ok)
{
    MessageBox.Show("You selected: " + dialog.FileName);
}

Answer 4

看看 Ookii Dialogs 库，它分别为 Windows 窗体和 WPF 实现了文件夹浏览器对话框。

Ookii.Dialogs.WinForms

https://github.com/augustoproiete/ookii-dialogs-winforms

---

Ookii.Dialogs.Wpf

https://github.com/augustoproiete/ookii-dialogs-wpf

Answer 5

这应该是最明显和最直接的方式

using (var dialog = new System.Windows.Forms.FolderBrowserDialog())
{

   System.Windows.Forms.DialogResult result = dialog.ShowDialog();

   if(result == System.Windows.Forms.DialogResult.OK)
   {
      selectedFolder = dialog.SelectedPath;
   }

}

Answer 6

这是另一种解决方案，它在一个简单的 ZIP 文件中包含所有可用的源代码。

它为 OpenFileDialog 提供了额外的窗口标志，使其像 Windows 7+ 文件夹选择对话框一样工作。

根据网站，它是公共领域：“没有许可证，您可以随意获取和使用代码。”

• 文章：.NET Win 7 风格的文件夹选择对话框 (http://www.lyquidity.com/devblog/?p=136)
• 源代码：http://s3downloads.lyquidity.com/FolderSelectDialog/FolderSelectDialog.zip

Archive.org 链接：

• 文章：https://web.archive.org/web/20180823181552/http://www.lyquidity.com/devblog/?p=136
• 源代码：https://web.archive.org/web/20180823181632/http://s3downloads.lyquidity.com/FolderSelectDialog/FolderSelectDialog.zip

Answer 7

有一个使用OpenFileDialog 的hackish 解决方案，其中ValidateNames 和CheckFileExists 都设置为false，FileName 被赋予一个模拟值以指示选择了一个目录。

我之所以说 hack，是因为它让用户对如何选择文件夹感到困惑。它们需要位于所需的文件夹中，然后在文件名显示“文件夹选择”时按打开。

这是基于 Denis Stankovski 的 Select file or folder from the same dialog。

OpenFileDialog folderBrowser = new OpenFileDialog();
// Set validate names and check file exists to false otherwise windows will
// not let you select "Folder Selection."
folderBrowser.ValidateNames = false;
folderBrowser.CheckFileExists = false;
folderBrowser.CheckPathExists = true;
// Always default to Folder Selection.
folderBrowser.FileName = "Folder Selection.";
if (folderBrowser.ShowDialog() == DialogResult.OK)
{
    string folderPath = Path.GetDirectoryName(folderBrowser.FileName);
    // ...
}

Answer 8

基本上你需要 FolderBrowserDialog 类：

提示用户选择一个文件夹。这个类不能被继承。

例子：

using(var fbd = new FolderBrowserDialog())
{
    DialogResult result = fbd.ShowDialog();

    if (result == DialogResult.OK && !string.IsNullOrWhiteSpace(fbd.SelectedPath))
    {
        string[] files = Directory.GetFiles(fbd.SelectedPath);

        System.Windows.Forms.MessageBox.Show("Files found: " + files.Length.ToString(), "Message");
    }
}

如果您在 WPF 中工作，则必须添加对 System.Windows.Forms 的引用。

您还必须为Directory 类添加using System.IO

Answer 9

在我看来，你只是在关注 FolderBrowserDialog。