user_folder/Dialog.aspx

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<%@ Page language="c#"%>
<script language="C#" runat="server">

// 定义消息内容
private string NoFileMessage = "请选择上传文件";
private string UploadSuccessMessage = "上传成功";
private string NoImagesMessage = "无文件";
private string NoFolderSpecifiedMessage = "文件夹不存在";
private string NoFileToDeleteMessage = "未删除文件";
private string InvalidFileTypeMessage = "无效的文件格式";
private string[] AcceptedFileTypes = new string[] {"jpg","jpeg","jpe","gif","bmp","png"};

// 定义变量
private bool	UploadIsEnabled = true;
private bool	DeleteIsEnabled = true;
private string	DefaultImageFolder = "image";

//定义处理程序
private void Page_Load(object sender, System.EventArgs e) 
{
    try
    {
        if (Session["user_level"].ToString().Equals("1") || Session["user_level"].ToString().Equals("2"))
        {
        }
        else
        {
            throw new ArgumentNullException();
        }
    }
    catch
    {
        Response.Redirect("register.aspx?errormassage='您还没有登陆'");
        Response.End();
    }
	string isframe = "" + Request["frame"];
	if (isframe != "") {
		MainPage.Visible = true;
		iframePanel.Visible = false;
	
		string rif = "" + Request["rif"];
		string cif = "" + Request["cif"];	

		if (cif != "" && rif != "")
		{
			RootImagesFolder.Value = rif;
			CurrentImagesFolder.Value = cif;
		} 
		else
		{
			RootImagesFolder.Value = DefaultImageFolder;
			CurrentImagesFolder.Value = DefaultImageFolder;	
		}

		UploadPanel.Visible = UploadIsEnabled;
		DeleteImage.Visible = DeleteIsEnabled;

		string FileErrorMessage = "";
		string ValidationString = ".*(";
		//[\.jpg]|[\.jpeg]|[\.jpe]|[\.gif]|[\.bmp]|[\.png])$"