[C#] 如何选择一个目录

基本思路是利用SHBrowseForFolder 于是有如下代码：

private enum BrowseFlag

{

BIF_RETURNONLYFSDIRS = 0x0001, // For finding a folder to start document searching

BIF_DONTGOBELOWDOMAIN = 0x0002, // For starting the Find Computer

BIF_STATUSTEXT = 0x0004,

BIF_RETURNFSANCESTORS = 0x0008,

BIF_EDITBOX = 0x0010,

BIF_VALIDATE = 0x0020, // insist on valid result (or CANCEL)

BIF_BROWSEFORCOMPUTER = 0x1000, // Browsing for Computers.

BIF_BROWSEFORPRINTER = 0x2000, // Browsing for Printers

BIF_BROWSEINCLUDEFILES= 0x4000 // Browsing for Everything

}

[StructLayout(LayoutKind.Sequential)]

private struct BrowseInfo

{

public IntPtr hwndOwner;

public IntPtr pidlRoot;

[MarshalAs(UnmanagedType.LPTStr)]

public string displayname;

[MarshalAs(UnmanagedType.LPTStr)]

public string title;

public int flags;

public IntPtr callback;

public IntPtr lparam;

}

[DllImport("shell32.dll", CharSet=CharSet.Auto)]

static extern IntPtr SHBrowseForFolder(ref BrowseInfo info);

[DllImport("shell32.dll", CharSet=CharSet.Auto)]

[return : MarshalAs(UnmanagedType.Bool)]

internal extern static bool SHGetPathFromIDList(IntPtr pidl, [MarshalAs(UnmanagedType.LPTStr)] System.Text.StringBuilder pszPath);

public static string BrowseFolder(IWin32Window owner)

{

BrowseInfo info = new BrowseInfo();

info.flags = (int)BrowseFlag.BIF_RETURNONLYFSDIRS

+ (int)BrowseFlag.BIF_STATUSTEXT

+ (int)BrowseFlag.BIF_VALIDATE;

info.hwndOwner = owner.Handle;

IntPtr pidlReturned = SHBrowseForFolder(ref info);

StringBuilder sb = new StringBuilder(260);

SHGetPathFromIDList(pidlReturned, sb);

return sb.ToString();

}

这绝对是最简便的解决办法。虽然没有释放pidlReturned有可能造成少量内存泄漏，但是那么一点内存，谁在乎呢？