通过WinAPI打开文件夹浏览源码

通过调用WinApi打开Windows浏览文件夹.

    调用方法：

         DirectorySelect dir = new DirectorySelect();
         string filePath = dir.GetDirectory();

源码：

1. using System;
2. using System.Collections.Generic;
3. using System.Text;
4. using System.Runtime.InteropServices;
6. namespace Open.NetExam.Maker
7. {
8.     public class DirectorySelect
9.     {
10.         [DllImport("Shell32.Dll", CharSet = CharSet.Auto)]
11.         private static extern IntPtr SHBrowseForFolder(ref   BROWSEINFO lpbi);
12.         [DllImport("Shell32.DLL")]
13.         public static extern int SHGetPathFromIDList(IntPtr pidl, StringBuilder Path);
15.         private static readonly int MAX_PATH = 260;
17.         private enum BIF_Flags
18.         {
19.             BIF_RETURNONLYFSDIRS = 0x0001,
20.             BIF_DONTGOBELOWDOMAIN = 0x0002,
21.             BIF_STATUSTEXT = 0x0004,
22.             BIF_RETURNFSANCESTORS = 0x0008,
23.             BIF_EDITBOX = 0x0010,
24.             BIF_VALIDATE = 0x0020,
25.             BIF_NEWDIALOGSTYLE = 0x0040,
26.             BIF_USENEWUI = (BIF_NEWDIALOGSTYLE | BIF_EDITBOX),
27.             BIF_BROWSEINCLUDEURLS = 0x0080,
28.             BIF_UAHINT = 0x0100,
29.             BIF_NONEWFOLDERBUTTON = 0x0200,
30.             BIF_NOTRANSLATETARGETS = 0x0400,
31.             BIF_BROWSEFORCOMPUTER = 0x1000,
32.             BIF_BROWSEFORPRINTER = 0x2000,
33.             BIF_BROWSEINCLUDEFILES = 0x4000,
34.             BIF_SHAREABLE = 0x8000
35.         };
38.         private delegate int BrowseCallbackProc(IntPtr hwnd, UInt32 uMsg, UInt32
39.         lParam, UInt32 lpData);
41.         [System.Runtime.InteropServices.StructLayout(LayoutKind.Sequential,
42.         CharSet = CharSet.Auto)]
43.         private struct BROWSEINFO
44.         {
45.             public IntPtr hwndOwner;
46.             public UIntPtr pidlRoot;
47.             [MarshalAs(UnmanagedType.LPTStr)]
48.             public String pszDisplayName;
49.             [MarshalAs(UnmanagedType.LPTStr)]
50.             public String lpszTitle;
51.             [MarshalAs(UnmanagedType.U4)]
52.             public BIF_Flags ulFlags;
53.             [MarshalAs(UnmanagedType.FunctionPtr)]
54.             public BrowseCallbackProc lpfn;
55.             [MarshalAs(UnmanagedType.U4)]
56.             public UInt32 lParam;
57.             public Int32 iImage;
58.         }
61.         /// <summary>
62.         /// 选择目录对话框
63.         /// </summary>
64.         /// <returns>返回选择的目录路径</returns>
65.         public string GetDirectory()
66.         {
67.             BROWSEINFO bi = new BROWSEINFO();
68.             IntPtr pidlRet = IntPtr.Zero;
70.             pidlRet = SHBrowseForFolder(ref bi);
72.             if (pidlRet == IntPtr.Zero)
73.             {
74.                 return string.Empty;
75.             }
76.             StringBuilder sb = new StringBuilder(MAX_PATH);
77.             if (0 == SHGetPathFromIDList(pidlRet, sb))
78.             {
79.                 return string.Empty;
80.             }
81.             return sb.ToString();
82.         }
83.     }
84. }