C# 选择目录的包装类。

 

1. using System;
2.         using System.Text;
3.         using System.Runtime.InteropServices;
5.         public class OpenFolderDialog
6.         {
7.             /*
8.             private struct SHITEMID
9.             {
10.              ushort cb;
11.              byte adID; // BYTE abID[1];
12.             }
13.             private struct ITEMIDLIST
14.             {
15.              SHITEMID mkid;
16.             }
17.             */
18.             [StructLayout(LayoutKind.Sequential)]
19.             private struct BROWSEINFO
20.             {
21.                 public IntPtr hwndOwner; // HWND hwndOwner
22.                 public IntPtr pidlRoot; // const ITEMIDLIST* pidlRoot
23.                 [MarshalAs(UnmanagedType.LPTStr)]
24.                 public string pszDisplayName;
25.                 [MarshalAs(UnmanagedType.LPTStr)]
26.                 public string lpszTitle;
27.                 public int ulFlags;
28.                 [MarshalAs(UnmanagedType.FunctionPtr)]
29.                 public BrowseCallBackProc lpfn;
30.                 [MarshalAs(UnmanagedType.LPTStr)]
31.                 public string lParam;
32.                 public int iImage;
33.             }
35.             [DllImport("User32.Dll")]
36.             [return: MarshalAs(UnmanagedType.Bool)]
37.             private extern static bool SendMessage(IntPtr hWnd, uint Msg, uint wParam, [MarshalAs(UnmanagedType.LPTStr)] string lParam);
38.             [DllImport("Shell32.dll", CharSet = CharSet.Auto)]
39.             private extern static IntPtr SHBrowseForFolder(ref BROWSEINFO lpbi);
40.             [DllImport("Shell32.dll", CharSet = CharSet.Auto)]
41.             [return: MarshalAs(UnmanagedType.Bool)]
42.             private extern static bool SHGetPathFromIDList(IntPtr pidl, StringBuilder pszPath);
43.             private delegate int BrowseCallBackProc(IntPtr hwnd, uint msg, IntPtr lParam, [MarshalAs(UnmanagedType.LPTStr)] string lpData);
44.             private static int BrowseCtrlCallback(IntPtr hwnd, uint uMsg, IntPtr lParam, [MarshalAs(UnmanagedType.LPTStr)] string lpData)
45.             {
46.                 if (uMsg == 1) // BFFM_INITIALIZED
47.                 {
48.                     string szPath = lpData;
49.                     if (szPath != null && szPath != "")
50.                     {
51.                         if (szPath[szPath.Length - 1] != '//')
52.                             szPath += '//';
53.                         SendMessage(hwnd, 0x400 + 103, 1, szPath); // BFFM_SETSELECTION
54.                     }
55.                 }
57.                 return 0;
59.             }
61.             // hwndOwner：父窗体句柄
62.             // Title：标题；可以为null，也可以为""
63.             // lpszInitPath：初始目录；可以为null，也可以为""；为null或""时指向“我的电脑”
64.             // return：如果按下了“确定”按钮则为用户选择的目录，否则返回null
65.             public static string ShowDialog(IntPtr hwndOwner, string Title, string lpszInitPath)
66.             {
67.                 BROWSEINFO BrInfo;
68.                 BrInfo.hwndOwner = hwndOwner;
69.                 BrInfo.pidlRoot = IntPtr.Zero;
70.                 BrInfo.pszDisplayName = null;
71.                 BrInfo.lpszTitle = Title;
72.                 BrInfo.ulFlags = 0x0001; // BIF_RETURNONLYFSDIRS
73.                 BrInfo.lpfn = new BrowseCallBackProc(BrowseCtrlCallback);
74.                 BrInfo.lParam = lpszInitPath;
75.                 BrInfo.iImage = 0;
77.                 IntPtr pidlDestination = SHBrowseForFolder(ref BrInfo);
78.                 string folderName = null;
79.                 if (pidlDestination != IntPtr.Zero)
80.                 {
81.                     StringBuilder tmp = new StringBuilder(260); // MAX_PATH
82.                     SHGetPathFromIDList(pidlDestination, tmp);
83.                     folderName = tmp.ToString();
84.                 }
85.                 return folderName;
86.             }
87.         }
88.     
90. ///调用方法
91. this.strItemFolder = OpenFolderDialog.ShowDialog(this.Handle, "选择目录", @"C:/");
92.             if (strItemFolder != null)
93.             {
94.                 ///set select save path.
95.                 textBox_Path.Text = this.strItemFolder;
97.                 ///获得目录 AND 创建目录
98.             }
99.             else
100.             {
101.                 MessageBox.Show("靠，你按了“取消”按钮，啥也没选");
102.             }