自定义文件夹选择对话框
选择文件使用OpenFileDialog，选择文件夹只有选择 FolderBrowserDialog，这种选择对话框让人有些抓狂，特别当文件目录比较深、需要多次选择文件夹操作时。
那么，如何定制一款既符合用户使用习惯，又能方便选择文件夹的对话框呢？
方案一 Microsoft类库
引用Microsoft.WindowsAPICodePack.dll 和Microsoft.WindowsAPICodePack.Shell.dll类库文件，就可以使用CommonOpenFileDialog类实现选择文件夹了。
var openFolder = new CommonOpenFileDialog();
openFolder.AllowNonFileSystemItems = true;
openFolder.Multiselect = true;
openFolder.IsFolderPicker = true;
openFolder.Title = "Select folders with jpg files";
if (openFolder.ShowDialog() != CommonFileDialogResult.Ok)
{
MessageBox.Show("No Folder selected");
return;
}
// get all the directories in selected dirctory
var dirs = openFolder.FileNames.ToArray();
方案二 第三方工具
为了解决这一痛点，很多第三方工具都给出了解决方案，如DevExpress重写了自己的XtraFolderBrowserDialog，当DialogStyle为Compact时，即为默认文件夹浏览对话框，当DialogStyle为Wide时，则为类似于OpenFileDialog的文件夹选择对话框，由开发者控制显示方式。
方案三 Windows API
自己动手，丰衣足食。
类库如下：
public class OpenFolderDialog
{
#region Internal Enums
internal enum FDAP
{
FDAP_BOTTOM = 0,
FDAP_TOP = 1
}
internal enum FDE_OVERWRITE_RESPONSE
{
FDEOR_DEFAULT = 0x00000000,
FDEOR_ACCEPT = 0x00000001,
FDEOR_REFUSE = 0x00000002
}
internal enum FDE_SHAREVIOLATION_RESPONSE
{
FDESVR_DEFAULT = 0x00000000,
FDESVR_ACCEPT = 0x00000001,
FDESVR_REFUSE = 0x00000002
}
[Flags]
internal enum FOS : uint
{
FOS_OVERWRITEPROMPT = 0x00000002,
FOS_STRICTFILETYPES = 0x00000004,
FOS_NOCHANGEDIR = 0x00000008,
FOS_PICKFOLDERS = 0x00000020,
FOS_FORCEFILESYSTEM = 0x00000040, // Ensure that items returned are filesystem items.
FOS_ALLNONSTORAGEITEMS = 0x00000080, // Allow choosing items that have no storage.
FOS_NOVALIDATE = 0x00000100,
FOS_ALLOWMULTISELECT = 0x00000200,
FOS_PATHMUSTEXIST = 0x00000800,
FOS_FILEMUSTEXIST = 0x00001000,
FOS_CREATEPROMPT = 0x00002000,
FOS_SHAREAWARE = 0x00004000,
FOS_NOREADONLYRETURN = 0x00008000,
FOS_NOTESTFILECREATE = 0x00010000,
FOS_HIDEMRUPLACES = 0x00020000,
FOS_HIDEPINNEDPLACES = 0x00040000,
FOS_NODEREFERENCELINKS = 0x00100000,
FOS_DONTADDTORECENT = 0x02000000,
FOS_FORCESHOWHIDDEN = 0x10000000,
FOS_DEFAULTNOMINIMODE = 0x20000000
}
internal enum SIATTRIBFLAGS
{
SIATTRIBFLAGS_AND = 1,
SIATTRIBFLAGS_APPCOMPAT = 3,
SIATTRIBFLAGS_OR = 2
}
internal 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
}
#endregion Internal Enums
#region 公共属性
/// <summary>
/// 文件
/// </summary>
public string Folder { get; set; }
/// <summary>
/// 标题
/// </summary>
public string Title { get; set; }
#endregion 公共属性
#region 公共方法
/// <summary>
/// 显示对话框架
/// </summary>
/// <param name="owner"></param>
/// <returns></returns>
public DialogResult ShowDialog(IWin32Window owner = null)
{
IntPtr hwndOwner = owner != null ? owner.Handle : NativeMethods.GetActiveWindow();
NativeInterfaces.IFileOpenDialog dialog = (NativeInterfaces.IFileOpenDialog)new FileOpenDialog();
try
{
NativeInterfaces.IShellItem item;
if (!string.IsNullOrEmpty(Folder))
{
Guid _shellItemGuid = typeof(NativeInterfaces.IShellItem).GUID;
item = (NativeInterfaces.IShellItem)NativeMethods.SHCreateItemFromParsingName(Folder, null, ref _shellItemGuid);
if (item != null)
dialog.SetFolder(item);
}
dialog.SetOptions(FOS.FOS_PICKFOLDERS | FOS.FOS_FORCEFILESYSTEM);
if (!string.IsNullOrEmpty(Title))
dialog.SetTitle(Title);
int hr = dialog.Show(hwndOwner);
if (hr == NativeMethods.ERROR_CANCELLED)
return DialogResult.Cancel;
if (hr != 0)
return DialogResult.Abort;
dialog.GetResult(out item);
item.GetDisplayName(SIGDN.SIGDN_FILESYSPATH, out string path);
Folder = path;
return DialogResult.OK;
}
finally { Marshal.ReleaseComObject(dialog); }
}
#endregion 公共方法
#region Internal Structs
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto, Pack = 4)]
internal struct COMDLG_FILTERSPEC
{
[MarshalAs(UnmanagedType.LPWStr)]
public string pszName;
[MarshalAs(UnmanagedType.LPWStr)]
public string pszSpec;
}
[StructLayout(LayoutKind.Sequential, Pack = 4)]
internal struct PROPERTYKEY
{
public Guid fmtid;
public uint pid;
}
#endregion Internal Structs
#region Internal Classes
internal static class NativeInterfaces
{
#region Public Interfaces
[ComImport, Guid("42f85136-db7e-439c-85f1-e4075d135fc8"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IFileDialog : IModalWindow
{
[PreserveSig]
new int Show([In] IntPtr parent);
void SetFileTypes([In] uint cFileTypes, [In][MarshalAs(UnmanagedType.LPArray)] COMDLG_FILTERSPEC[] rgFilterSpec);
void SetFileTypeIndex([In] uint iFileType);
void GetFileTypeIndex(out uint piFileType);
void Advise([In, MarshalAs(UnmanagedType.Interface)] IFileDialogEvents pfde, out uint pdwCookie);
void Unadvise([In] uint dwCookie);
void SetOptions([In] FOS fos);
void GetOptions(out FOS pfos);
void SetDefaultFolder([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi);
void SetFolder([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi);
void GetFolder([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);
void GetCurrentSelection([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);
void SetFileName([In, MarshalAs(UnmanagedType.LPWStr)] string pszName);
void GetFileName([MarshalAs(UnmanagedType.LPWStr)] out string pszName);
void SetTitle([In, MarshalAs(UnmanagedType.LPWStr)] string pszTitle);
void SetOkButtonLabel([In, MarshalAs(UnmanagedType.LPWStr)] string pszText);
void SetFileNameLabel([In, MarshalAs(UnmanagedType.LPWStr)] string pszLabel);
void GetResult([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);
void AddPlace([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi, int alignment);
void SetDefaultExtension([In, MarshalAs(UnmanagedType.LPWStr)] string pszDefaultExtension);
void Close([MarshalAs(UnmanagedType.Error)] int hr);
void SetClientGuid([In] ref Guid guid);
void ClearClientData();
void SetFilter([MarshalAs(UnmanagedType.Interface)] IntPtr pFilter);
}
[ComImport, Guid("973510DB-7D7F-452B-8975-74A85828D354"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IFileDialogEvents
{
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime), PreserveSig]
int OnFileOk([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime), PreserveSig]
int OnFolderChanging([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd,
[In, MarshalAs(UnmanagedType.Interface)] IShellItem psiFolder);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void OnFolderChange([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void OnSelectionChange([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void OnShareViolation([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd,
[In, MarshalAs(UnmanagedType.Interface)] IShellItem psi,
out FDE_SHAREVIOLATION_RESPONSE pResponse);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void OnTypeChange([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void OnOverwrite([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd,
[In, MarshalAs(UnmanagedType.Interface)] IShellItem psi,
out FDE_OVERWRITE_RESPONSE pResponse);
}
[ComImport, Guid("d57c7288-d4ad-4768-be02-9d969532d960"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IFileOpenDialog : IFileDialog
{
void AddPlace([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi, FileDialogCustomPlace fdcp);
void GetResults([MarshalAs(UnmanagedType.Interface)] out IShellItemArray ppenum);
void GetSelectedItems([MarshalAs(UnmanagedType.Interface)] out IShellItemArray ppsai);
}
[ComImport, Guid("b4db1657-70d7-485e-8e3e-6fcb5a5c1802"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IModalWindow
{
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime), PreserveSig]
uint Show([In] IntPtr parent);
}
[ComImport, Guid("43826D1E-E718-42EE-BC55-A1E261C37BFE"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IShellItem
{
void BindToHandler([In, MarshalAs(UnmanagedType.Interface)] IntPtr pbc, [In] ref Guid bhid, [In] ref Guid riid, out IntPtr ppv);
void GetParent([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);
void GetDisplayName([In] SIGDN sigdnName, [MarshalAs(UnmanagedType.LPWStr)] out string ppszName);
void GetAttributes([In] uint sfgaoMask, out uint psfgaoAttribs);
void Compare([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi, [In] uint hint, out int piOrder);
}
[ComImport, Guid("B63EA76D-1F85-456F-A19C-48159EFA858B"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IShellItemArray
{
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void BindToHandler([In, MarshalAs(UnmanagedType.Interface)] IntPtr pbc, [In] ref Guid rbhid,
[In] ref Guid riid, out IntPtr ppvOut);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void GetPropertyStore([In] int Flags, [In] ref Guid riid, out IntPtr ppv);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void GetPropertyDescriptionList([In] ref PROPERTYKEY keyType, [In] ref Guid riid, out IntPtr ppv);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void GetAttributes([In] SIATTRIBFLAGS dwAttribFlags, [In] uint sfgaoMask, out uint psfgaoAttribs);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void GetCount(out uint pdwNumItems);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void GetItemAt([In] uint dwIndex, [MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void EnumItems([MarshalAs(UnmanagedType.Interface)] out IntPtr ppenumShellItems);
}
#endregion Public Interfaces
}
[SuppressUnmanagedCodeSecurity]
internal static class NativeMethods
{
#region Public Fields
public const int ERROR_CANCELLED = unchecked((int)0x800704C7);
#endregion Public Fields
#region Public Methods
[DllImport("user32.dll")]
public static extern IntPtr GetActiveWindow();
[DllImport("shell32.dll", SetLastError = true, CharSet = CharSet.Unicode, PreserveSig = false)]
[return: MarshalAs(UnmanagedType.Interface)]
public static extern object SHCreateItemFromParsingName(
[MarshalAs(UnmanagedType.LPWStr)] string pszPath, IBindCtx pbc, ref Guid riid);
#endregion Public Methods
}
#endregion Internal Classes
#region Private Classes
[ComImport, Guid("DC1C5A9C-E88A-4dde-A5A1-60F82A20AEF7")]
private class FileOpenDialog { }
#endregion Private Classes
}
作者：我也是个傻瓜
出处：http://www.cnblogs.com/liweis/
签名：成熟是一种明亮而不刺眼的光辉。
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