WINCE中选择目录组件（C#）

　　因为项目需要一个选择目录的功能，然.NET中在WINCE中folderBrowserDialog组件却不可用，在网上搜了2天都没找到此类可用资源，更搞的是有个资源说是通过导入Shell32.dll的API方式来调用，为引足足浪费半天时间也没找到WINCE平台上的Shell32.dll究竟在何处！不得已，只好自己写个，没想到2个多小时就搞定了，真搞不懂这么简单的资源网上也没有，难道是做嵌入式开的较少？看来自己的工作思路还是有点问题，碰到问题，首先想到google，这也是长年养成的依赖性。好了，废话不说了，简单讲讲思路如下：

　　参考界面如下：

　　整个组件分三部分：

　　1、选择目录的主界面：

　　　　需要一个TreeView组件，主要代码如下：

private void FrmSelectFolder_Load(object sender, EventArgs e)
        {
            string errstr = "";
            try
            {
                tvPathList.Nodes.Clear();

                string currentPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase);
                string rootPath = Directory.GetDirectoryRoot(currentPath);

                TreeNode rootNode = new TreeNode("我的设备");
                tvPathList.Nodes.Add(rootNode);

                //写个递归目录中全部文件夹检索出来
                ScanFolder(rootNode, rootPath);

                rootNode.Expand();
            }
            catch (System.Exception ex)
            {
                errstr = "fail to FrmSelectFolder_Load【" + ex.Message + "】";
                MessageBox.Show(errstr);
            }
        }

private void ScanFolder(TreeNode node, string path)
            {
                string errstr = "";
                try
                {
                    string[] pathList = Directory.GetDirectories(path);

                    foreach (string p in pathList)
                    {
                        string strp = p.Replace(path, "");

                        if (strp.Substring(0, 1) == @"\")
                        {
                            strp = strp.Substring(1, strp.Length - 1);
                        }
                        TreeNode treeNode = new TreeNode(strp);
                        treeNode.ImageIndex = SelectImageIndex(strp, false);
                        node.Nodes.Add(treeNode);

                        ScanFolder(treeNode, p);
                    }
                }
                catch (System.Exception ex)
                {
                    errstr = "fail to ScanFolder【" + ex.Message + "】";
                    MessageBox.Show(errstr);
                }
            }

　　2、新建文件夹界面

　　　  考虑到新建文件夹已存在的情况会自动加1.

private void btnNew_Click(object sender, EventArgs e)
        {
            string errstr = "";
            try
            {
                TreeNode node = tvPathList.SelectedNode;
                if (node == null)
                {
                    MessageBox.Show("未选择目录");
                    return;
                }

                FrmNewFolder fnf = new FrmNewFolder();
                fnf.Location = new Point((Screen.PrimaryScreen.Bounds.Width - fnf.Width) / 2, (Screen.PrimaryScreen.Bounds.Height - fnf.Height) / 2);
                if (fnf.ShowDialog() == DialogResult.Cancel) { return; }

                string folderName = fnf.m_folderName;

                //计算当前目录的绝对路径
                string currentPath = "";
                TreeNode currentNode = node;
                while (currentNode.Parent != null)
                {
                    currentPath = currentNode.Text + @"\" + currentPath;
                    currentNode = currentNode.Parent;
                }

                string newCurrentPath =  @"\" + currentPath + folderName + @"\";

                if (Directory.Exists(newCurrentPath))
                {
                    if (folderName != "新建文件夹")
                    {
                        MessageBox.Show("文件夹【" + folderName + "】已存在!");
                        return;
                    }
                    else
                    {
                        //自动增加一个不存在的文件夹目录
                        int index = 1;
                        string newFolderName = String.Format("{0}{1}", folderName, index);
                        while (Directory.Exists(@"\" + currentPath + newFolderName + @"\"))
                        {
                            index++;
                            newFolderName = String.Format("{0}{1}", folderName, index);
                        }
                        folderName = newFolderName;
                        newCurrentPath = @"\" + currentPath + folderName + @"\"; 
                    }
                }

                DirectoryInfo di = Directory.CreateDirectory(newCurrentPath);
                
                TreeNode treeNode = new TreeNode(folderName);
                treeNode.ImageIndex = SelectImageIndex(folderName, false);
                node.Nodes.Insert(0, treeNode);
            }
            catch (System.Exception ex)
            {
                errstr = "fail to btnNew_Click【" + ex.Message + "】";
                MessageBox.Show(errstr);
            }
        }

　　3、调用此选择目录的主界面方法

public bool Execute(ref string errstr)
        {
            bool bRet = false;
            try
            {
                FrmSelectFolder fsf = new FrmSelectFolder();
                fsf.Location = new Point((Screen.PrimaryScreen.Bounds.Width - fsf.Width) / 2, (Screen.PrimaryScreen.Bounds.Height - fsf.Height) / 2);
                if (fsf.ShowDialog() == DialogResult.OK)
                {
                    FolderName = fsf.m_selectFoldeName;
                    bRet = true;
                }
                else
                {
                    errstr = "取消选择";
                }
                return bRet;
            }
            catch (System.Exception ex)
            {
                errstr = "fail to Execute【" + ex.Message + "】";
                return bRet;
            }
        }

或

public bool Execute(Control value, ref string errstr)
        {
            bool bRet = false;
            try
            {
                FrmSelectFolder fsf = new FrmSelectFolder();
                fsf.Location = new Point((value.Width - fsf.Width) / 2, (value.Height - fsf.Height) / 2);
                if (fsf.ShowDialog() == DialogResult.OK)
                {
                    FolderName = fsf.m_selectFoldeName;
                    bRet = true;
                }
                else
                {
                    errstr = "取消选择";
                }
                return bRet;
            }
            catch (System.Exception ex)
            {
                errstr = "fail to Execute【" + ex.Message + "】";
                return bRet;
            }
        }

 最后写个DEMO调用：

private void button3_Click(object sender, EventArgs e)
        {
            SelectFolder.SelectFolder sf = new SelectFolder.SelectFolder();
            if (sf.Execute(this))
            {
                MessageBox.Show(sf.FolderName);
            }
        }

效果如下：

完整代码下载：

http://download.csdn.net/detail/laststep/4528434

注：类似Dialg的组件是怎么做的，没搞明白，因此组件对象化效果不好，不能在运行模式下隐藏，哪位知道怎么做的，交流下，谢谢！