C#两种方式获取指定文件夹下所有子目录及文件

 /**************************************** 
    * 函数名称：GetFoldAll(string Path) 
    * 功能说明：获取指定文件夹下所有子目录及文件(树形) 
    * 参 数：Path:详细路径 
    * 调用示列： 
    * string strDirlist = Server.MapPath("templates"); 
    * this.Literal1.Text = EC.FileObj.GetFoldAll(strDirlist); 
    *****************************************/
    /// <summary> 
    /// 获取指定文件夹下所有子目录及文件 
    /// </summary> 
    /// <param name="Path">详细路径</param> 
    public static string GetFoldAll(string Path)
    {
        string str = "";
        DirectoryInfo thisOne = new DirectoryInfo(Path);
        str = ListTreeShow(thisOne, 0, str);
        return str;
    }
    /// <summary> 
    /// 获取指定文件夹下所有子目录及文件函数 
    /// </summary> 
    /// <param name="theDir">指定目录</param> 
    /// <param name="nLevel">默认起始值,调用时,一般为0</param> 
    /// <param name="Rn">用于迭加的传入值,一般为空</param> 
    /// <returns></returns> 
    public static string ListTreeShow(DirectoryInfo theDir, int nLevel, string Rn)//递归目录 文件 
    {
        DirectoryInfo[] subDirectories = theDir.GetDirectories();//获得目录 
        foreach (DirectoryInfo dirinfo in subDirectories)
        {
            if (nLevel == 0)
            {
                Rn += "├";
            }
            else
            {
                string _s = "";
                for (int i = 1; i <= nLevel; i++)
                {
                    _s += "│ ";
                }
                Rn += _s + "├";
            }
            Rn += "<b>" + dirinfo.Name.ToString() + "</b><br />";
            FileInfo[] fileInfo = dirinfo.GetFiles(); //目录下的文件 
            foreach (FileInfo fInfo in fileInfo)
            {
                if (nLevel == 0)
                {
                    Rn += "│ ├";
                }
                else
                {
                    string _f = "";
                    for (int i = 1; i <= nLevel; i++)
                    {
                        _f += "│ ";
                    }
                    Rn += _f + "│ ├";
                }
                Rn += fInfo.Name.ToString() + " <br />";
            }
            Rn = ListTreeShow(dirinfo, nLevel + 1, Rn);
        }
        return Rn;
    }
    /**************************************** 
    * 函数名称：GetFoldAll(string Path) 
    * 功能说明：获取指定文件夹下所有子目录及文件(下拉框形) 
    * 参 数：Path:详细路径 
    * 调用示列： 
    * string strDirlist = Server.MapPath("templates"); 
    * this.Literal2.Text = EC.FileObj.GetFoldAll(strDirlist,"tpl",""); 
    *****************************************/
    /// <summary> 
    /// 获取指定文件夹下所有子目录及文件(下拉框形) 
    /// </summary> 
    /// <param name="Path">详细路径</param> 
    ///<param name="DropName">下拉列表名称</param> 
    ///<param name="tplPath">默认选择模板名称</param> 
    public static string GetFoldAll(string Path, string DropName, string tplPath)
    {
        string strDrop = "<select name=\"" + DropName + "\" id=\"" + DropName + "\"><option value=\"\">--请选择详细模板--</option>";
        string str = "";
        DirectoryInfo thisOne = new DirectoryInfo(Path);
        str = ListTreeShow(thisOne, 0, str, tplPath);
        return strDrop + str + "</select>";
    }
    /// <summary> 
    /// 获取指定文件夹下所有子目录及文件函数 
    /// </summary> 
    /// <param name="theDir">指定目录</param> 
    /// <param name="nLevel">默认起始值,调用时,一般为0</param> 
    /// <param name="Rn">用于迭加的传入值,一般为空</param> 
    /// <param name="tplPath">默认选择模板名称</param> 
    /// <returns></returns> 
    public static string ListTreeShow(DirectoryInfo theDir, int nLevel, string Rn, string tplPath)//递归目录 文件 
    {
        DirectoryInfo[] subDirectories = theDir.GetDirectories();//获得目录 
        foreach (DirectoryInfo dirinfo in subDirectories)
        {
            Rn += "<option value=\"" + dirinfo.Name.ToString() + "\"";
            if (tplPath.ToLower() == dirinfo.Name.ToString().ToLower())
            {
                Rn += " selected ";
            }
            Rn += ">";
            if (nLevel == 0)
            {
                Rn += "┣";
            }
            else
            {
                string _s = "";
                for (int i = 1; i <= nLevel; i++)
                {
                    _s += "│ ";
                }
                Rn += _s + "┣";
            }
            Rn += "" + dirinfo.Name.ToString() + "</option>";
            FileInfo[] fileInfo = dirinfo.GetFiles(); //目录下的文件 
            foreach (FileInfo fInfo in fileInfo)
            {
                Rn += "<option value=\"" + dirinfo.Name.ToString() + "/" + fInfo.Name.ToString() + "\"";
                if (tplPath.ToLower() == fInfo.Name.ToString().ToLower())
                {
                    Rn += " selected ";
                }
                Rn += ">";
                if (nLevel == 0)
                {
                    Rn += "│ ├";
                }
                else
                {
                    string _f = "";
                    for (int i = 1; i <= nLevel; i++)
                    {
                        _f += "│ ";
                    }
                    Rn += _f + "│ ├";
                }
                Rn += fInfo.Name.ToString() + "</option>";
            }
            Rn = ListTreeShow(dirinfo, nLevel + 1, Rn, tplPath);
        }
        return Rn;
    }