客户端访问服务器端方法（客户端引入服务器端类）

首先声明这个是我在使用FreeTextBox时遇到了这个控件把所有的服务器端代码写到客户端，
代码如下：

<script runat="server">

// Messages
private string NoFileMessage = "您没有选择文件。";
private string UploadSuccessMessage = "上传成功";
private string UploadFailureMessage = "上传失败。";
private string NoImagesMessage = "该文件夹不存在或者是空的";
private string NoFolderSpecifiedMessage = "您要上传到的文件夹不存在。";
private string NoFileToDeleteMessage = "您没有选中要删除的文件。";
private string InvalidFileTypeMessage = "您无法上传这种类型的文件。";
private string[] AcceptedFileTypes = new string[] {"jpg","jpeg","jpe","gif","png"};

// Configuration
private bool    UploadIsEnabled = true;         // 是否允许上传文件
private bool    DeleteIsEnabled = true;         // 是否允许删除文件
private string    DefaultImageFolder ="defaultFolder";  // 默认的起始文件夹

private void Page_Load(object sender, System.EventArgs e) {
    string isframe = "" + Request["frame"];
        if (isframe != "") {
        MainPage.Visible = true;
        iframePanel.Visible = false;
    WebForm1 wf=new WebForm1();
        string rif = "" + Request["rif"];
        string cif = "" + Request["cif"];    

        if (cif != "" && rif != "") {
            RootImagesFolder.Value = DefaultImageFolder;
            CurrentImagesFolder.Value = DefaultImageFolder;    
        }
        UploadPanel.Visible = UploadIsEnabled;
        DeleteImage.Visible = DeleteIsEnabled;

        string FileErrorMessage = "";
        string ValidationString = ".*(";
        //[\.jpg]|[\.jpeg]|[\.jpe]|[\.gif]|[\.png])$"
        for (int i=0;i<AcceptedFileTypes.Length; i++) {
            ValidationString += "[\\." + AcceptedFileTypes[i] + "]";
            if (i < (AcceptedFileTypes.Length-1)) ValidationString += "|";
            FileErrorMessage += AcceptedFileTypes[i];
            if (i < (AcceptedFileTypes.Length-1)) FileErrorMessage += ", ";
        }
        FileValidator.ValidationExpression = ValidationString+")$";
        FileValidator.ErrorMessage=FileErrorMessage;

        if (!IsPostBack) {
            
        
        DisplayImages();
        }
    } else {
        
    }
}

public void UploadImage_OnClick(object sender, EventArgs e) {    
    if (Page.IsValid) {
        if (CurrentImagesFolder.Value != "") {
            if (UploadFile.PostedFile.FileName.Trim() != "") {
                if (IsValidFileType(UploadFile.PostedFile.FileName)) {
                    try {
                        string UploadFileName = "";
                        string UploadFileDestination = "";
                        UploadFileName = UploadFile.PostedFile.FileName;
                        UploadFileName = UploadFileName.Substring(UploadFileName.LastIndexOf("\\")+1);
                        UploadFileDestination = HttpContext.Current.Request.PhysicalApplicationPath;
                        UploadFileDestination += CurrentImagesFolder.Value;
                        UploadFileDestination += "\\";
                        UploadFile.PostedFile.SaveAs(UploadFileDestination + UploadFileName);
                        ResultsMessage.Text = UploadSuccessMessage;
                    } catch(Exception ex) {
                        //ResultsMessage.Text = "Your file could not be uploaded: " + ex.Message;
                        ResultsMessage.Text = UploadFailureMessage;
                    }
                } else {
                    ResultsMessage.Text = InvalidFileTypeMessage;
                }
            } else {
                ResultsMessage.Text = NoFileMessage;
            }
        } else {
            ResultsMessage.Text = NoFolderSpecifiedMessage;
        }
    } else {
        ResultsMessage.Text = InvalidFileTypeMessage;
        
    }
    DisplayImages();
}

public void DeleteImage_OnClick(object sender, EventArgs e) {
    if (FileToDelete.Value != "" && FileToDelete.Value != "undefined") {
        try {
            string AppPath = HttpContext.Current.Request.PhysicalApplicationPath;
            System.IO.File.Delete(AppPath  + CurrentImagesFolder.Value + "\\" + FileToDelete.Value);
            ResultsMessage.Text = "已删除: " + FileToDelete.Value;
        } catch(Exception ex) {            
            ResultsMessage.Text = "删除失败。";
        }
    } else {
        ResultsMessage.Text = NoFileToDeleteMessage;
    }
    DisplayImages();
}

private bool IsValidFileType(string FileName) {
    string ext = FileName.Substring(FileName.LastIndexOf(".")+1,FileName.Length-FileName.LastIndexOf(".")-1);
    for (int i=0; i<AcceptedFileTypes.Length; i++) {
        if (ext == AcceptedFileTypes[i]) {
            return true;
            
        }    
    }
    return false;
}


private string[] ReturnFilesArray() {
    if (CurrentImagesFolder.Value != "") {
        try {
            string AppPath = HttpContext.Current.Request.PhysicalApplicationPath;
            string ImageFolderPath = AppPath + CurrentImagesFolder.Value;
            string[] FilesArray = System.IO.Directory.GetFiles(ImageFolderPath,"*");
            return FilesArray;
            
            
        } catch {
        
            return null;
        }
    } else {
        return null;
    }

}

private string[] ReturnDirectoriesArray() {
    if (CurrentImagesFolder.Value != "") {
        try {
            string AppPath = HttpContext.Current.Request.PhysicalApplicationPath;
            string CurrentFolderPath = AppPath + CurrentImagesFolder.Value;
            string[] DirectoriesArray = System.IO.Directory.GetDirectories(CurrentFolderPath,"*");
            return DirectoriesArray ;
        } catch {
            return null;
        }
    } else {
        return null;
    }
}

public void DisplayImages() {
    string[] FilesArray = ReturnFilesArray();
    string[] DirectoriesArray = ReturnDirectoriesArray();
    string AppPath = HttpContext.Current.Request.PhysicalApplicationPath;
    string AppUrl;
    
    //Get the application's URL
    if (Request.ApplicationPath == "/")
        AppUrl = Request.ApplicationPath;
    else
        AppUrl = Request.ApplicationPath + "/";
    
    GalleryPanel.Controls.Clear();
    if ( (FilesArray == null || FilesArray.Length == 0) && (DirectoriesArray == null || DirectoriesArray.Length == 0) ) {
        gallerymessage.Text = NoImagesMessage + ": " + RootImagesFolder.Value;
    } else {
        string ImageFileName = "";
        string ImageFileLocation = "";

        int thumbWidth = 94;
        int thumbHeight = 94;
        
        if (CurrentImagesFolder.Value != RootImagesFolder.Value) {

            System.Web.UI.HtmlControls.HtmlImage myHtmlImage = new System.Web.UI.HtmlControls.HtmlImage();
            myHtmlImage.Src = AppUrl + "../images/ftb/folder.up.gif";
            myHtmlImage.Attributes["unselectable"]="on"; 
            myHtmlImage.Attributes["align"]="absmiddle"; 
            myHtmlImage.Attributes["vspace"]="36"; 

            string ParentFolder = CurrentImagesFolder.Value.Substring(0,CurrentImagesFolder.Value.LastIndexOf("\\"));

            System.Web.UI.WebControls.Panel myImageHolder = new System.Web.UI.WebControls.Panel();                    
            myImageHolder.CssClass = "imageholder";
            myImageHolder.Attributes["unselectable"]="on"; 
            myImageHolder.Attributes["onclick"]="divClick(this,'');";  
            myImageHolder.Attributes["ondblclick"]="gotoFolder('" + RootImagesFolder.Value + "','" + ParentFolder.Replace("\\","\\\\") + "');";  
            myImageHolder.Controls.Add(myHtmlImage);

            System.Web.UI.WebControls.Panel myMainHolder = new System.Web.UI.WebControls.Panel();
            myMainHolder.CssClass = "imagespacer";
            myMainHolder.Controls.Add(myImageHolder);

            System.Web.UI.WebControls.Panel myTitleHolder = new System.Web.UI.WebControls.Panel();
            myTitleHolder.CssClass = "titleHolder";
            myTitleHolder.Controls.Add(new LiteralControl("向上"));
            myMainHolder.Controls.Add(myTitleHolder);

            GalleryPanel.Controls.Add(myMainHolder);        
            
        }
        
        foreach (string _Directory in DirectoriesArray) {
            
            try {
                string DirectoryName = _Directory.ToString();
                

                System.Web.UI.HtmlControls.HtmlImage myHtmlImage = new System.Web.UI.HtmlControls.HtmlImage();
                myHtmlImage.Src = AppUrl + "../images/ftb/folder.big.gif";
                myHtmlImage.Attributes["unselectable"]="on"; 
                myHtmlImage.Attributes["align"]="absmiddle"; 
                myHtmlImage.Attributes["vspace"]="29"; 

                System.Web.UI.WebControls.Panel myImageHolder = new System.Web.UI.WebControls.Panel();                    
                myImageHolder.CssClass = "imageholder";
                myImageHolder.Attributes["unselectable"]="on"; 
                myImageHolder.Attributes["onclick"]="divClick(this);";  
                myImageHolder.Attributes["ondblclick"]="gotoFolder('" + RootImagesFolder.Value + "','" + DirectoryName.Replace(AppPath,"").Replace("\\","\\\\") + "');";  
                myImageHolder.Controls.Add(myHtmlImage);

                System.Web.UI.WebControls.Panel myMainHolder = new System.Web.UI.WebControls.Panel();
                myMainHolder.CssClass = "imagespacer";
                myMainHolder.Controls.Add(myImageHolder);

                System.Web.UI.WebControls.Panel myTitleHolder = new System.Web.UI.WebControls.Panel();
                myTitleHolder.CssClass = "titleHolder";
                myTitleHolder.Controls.Add(new LiteralControl(DirectoryName.Replace(AppPath + CurrentImagesFolder.Value + "\\","")));
                myMainHolder.Controls.Add(myTitleHolder);

                GalleryPanel.Controls.Add(myMainHolder);        
            } catch {
                // nothing for error
            }
        }
        
        foreach (string ImageFile in FilesArray) {

            try {

                ImageFileName = ImageFile.ToString();
                ImageFileName = ImageFileName.Substring(ImageFileName.LastIndexOf("\\")+1);
                ImageFileLocation = AppUrl;
                ImageFileLocation = ImageFileLocation.Substring(ImageFileLocation.LastIndexOf("\\")+1);
                //galleryfilelocation += "/";
                ImageFileLocation += CurrentImagesFolder.Value;
                ImageFileLocation += "/";
                ImageFileLocation += ImageFileName;
                System.Web.UI.HtmlControls.HtmlImage myHtmlImage = new System.Web.UI.HtmlControls.HtmlImage();
                myHtmlImage.Src = ImageFileLocation;
                System.Drawing.Image myImage = System.Drawing.Image.FromFile(ImageFile.ToString());
                myHtmlImage.Attributes["unselectable"]="on";  
                //myHtmlImage.border=0;

                // landscape image
                if (myImage.Width > myImage.Height) {
                    if (myImage.Width > thumbWidth) {
                        myHtmlImage.Width = thumbWidth;
                        myHtmlImage.Height = Convert.ToInt32(myImage.Height * thumbWidth/myImage.Width);                        
                    } else {
                        myHtmlImage.Width = myImage.Width;
                        myHtmlImage.Height = myImage.Height;
                    }
                // portrait image
                } else {
                    if (myImage.Height > thumbHeight) {
                        myHtmlImage.Height = thumbHeight;
                        myHtmlImage.Width = Convert.ToInt32(myImage.Width * thumbHeight/myImage.Height);
                    } else {
                        myHtmlImage.Width = myImage.Width;
                        myHtmlImage.Height = myImage.Height;
                    }
                }
                
                if (myHtmlImage.Height < thumbHeight) {
                    myHtmlImage.Attributes["vspace"] = Convert.ToInt32((thumbHeight/2)-(myHtmlImage.Height/2)).ToString(); 
                }


                System.Web.UI.WebControls.Panel myImageHolder = new System.Web.UI.WebControls.Panel();                    
                myImageHolder.CssClass = "imageholder";
                myImageHolder.Attributes["onclick"]="divClick(this,'" + ImageFileName + "');";  
                myImageHolder.Attributes["ondblclick"]="returnImage('" + ImageFileLocation.Replace("\\","/") + "','" + myImage.Width.ToString() + "','" + myImage.Height.ToString() + "');";  
                myImageHolder.Controls.Add(myHtmlImage);


                System.Web.UI.WebControls.Panel myMainHolder = new System.Web.UI.WebControls.Panel();
                myMainHolder.CssClass = "imagespacer";
                myMainHolder.Controls.Add(myImageHolder);

                System.Web.UI.WebControls.Panel myTitleHolder = new System.Web.UI.WebControls.Panel();
                myTitleHolder.CssClass = "titleHolder";
                myTitleHolder.Controls.Add(new LiteralControl(ImageFileName + "<BR>" + myImage.Width.ToString() + "x" + myImage.Height.ToString()));
                myMainHolder.Controls.Add(myTitleHolder);

                //GalleryPanel.Controls.Add(myImage);
                GalleryPanel.Controls.Add(myMainHolder);
                
                myImage.Dispose();
            } catch {

            }
        }
        gallerymessage.Text = "";
    }
}
</script>
<asp:panel id="MainPage" runat="server" visible="false">
<!doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<META HTTP-EQUIV="Expires" CONTENT="0">
<title>插入图片</title>
<style>

body {
    margin: 0px 0px 0px 0px;
    padding: 0px 0px 0px 0px;
    background: #ffffff; 
    width: 99.99%;
    overflow:hidden;
    border: 0;
}

body,tr,td {
    color: #000000;
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 10pt;
}

div.imagespacer {
    width: 120;
    height: 126;
    text-align: center;            
    float: left;
    font: 10pt verdana;
    margin: 5px;
    overflow: hidden;
}
div.imageholder {
    margin: 0px;
    padding: 0px;
    border: 1 solid #CCCCCC;
    width: 100;
    height: 100;
}

div.titleholder {
    font-family: ms sans serif, arial;
    font-size: 8pt;
    width: 100;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;            
}        

</style>


<script language="javascript">

 function GetPathByPeople() 

    {

        var re1=UI_PUB_01.GetPath();
    
        document.getElementById("txtPath").value=re1.value
        //alert(document.getElementById("txtPath").value);
    
        }
            
lastDiv = null;
function divClick(theDiv,filename) {
    if (lastDiv) {
        lastDiv.style.border = "1 solid #CCCCCC";
    }
    lastDiv = theDiv;
    theDiv.style.border = "2 solid #316AC5";
    
    document.getElementById("FileToDelete").value = filename;

}
function gotoFolder(rootfolder,newfolder) {
    window.navigate("ftb.imagegallery.aspx?frame=1&rif=" + rootfolder + "&cif=" + newfolder);
}        
function returnImage(imagename,width,height) {
    var arr = new Array();
    arr["filename"] = imagename;  
    arr["width"] = width;  
    arr["height"] = height;             
    window.parent.returnValue = arr;
    window.parent.close();    
}        
</script>        
</HEAD>
<body >
<table width=99.99% height=99.99% cellpadding=0 cellspacing=0 border=0>

<FORM encType="multipart/form-data" runat="server">

<tr><td>
    <div id="galleryarea" style="width=99.99%; height:99.99%; overflow: auto;">
        <asp:label id="gallerymessage" runat="server"></asp:label><asp:textbox id="txtPath" style="Z-INDEX: 101; LEFT: 88px; display:none;POSITION: absolute; TOP: 160px" runat="server">aaaa</asp:textbox>
        <asp:panel id="GalleryPanel" runat="server"></asp:panel>
    </div>
</td></tr>
<asp:Panel id="UploadPanel" runat="server">
<tr><td height=16 style="padding-left:10px;border-top: 1 solid #999999; background-color:#99ccff;">
    
    <table>
    <tr>
        <td valign=top><input id="UploadFile" type="file" name="UploadFile" runat="server" style="width:300;"/></td>
        <td valign=top><asp:button id="UploadImage" Text="上传" runat="server" onclick="UploadImage_OnClick" /></td>
        <td valign=top><asp:button id="DeleteImage" Text="删除" runat="server" onclick="DeleteImage_OnClick" /></td>
        <td valign=middle>        
    </tr>
    <tr>
        <td colspan=3>
            <asp:RegularExpressionValidator runat="server" 
                ControlToValidate="UploadFile" 
                id="FileValidator" display="dynamic"/>
            <asp:literal id="ResultsMessage" runat="server" />        
        </td>        
    </tr></table>    
    <input type="hidden" id="FileToDelete" Value="" runat="server" />
    <input type="hidden" id="RootImagesFolder" Value="images" runat="server" />
    <input type="hidden" id="CurrentImagesFolder" Value="images" runat="server" />
</td></tr>
</asp:panel>
</form>
</table>
</body>
</HTML>
</asp:panel>
<asp:panel id="iframePanel" runat="server" >
<html> 
<head><title>插入图片</title></head>
<style>
body {
    margin: 0px 0px 0px 0px;
    padding: 0px 0px 0px 0px;
    background: #ffffff;
    overflow:hidden;
}
</style>
<body >
    <iframe style="width:99.99%;height:99.99%;border:0;" border=0 frameborder=0 src="ftb.imagegallery.aspx?frame=1&<%=Request.QueryString%>"></iframe>
</body>
</html>
</asp:panel>

我想在其上传的时候根据不同的人上传到不同的文件夹，同时显示不同的文件夹。即是修改DefaultImageFolder文件夹名。刚开始的时候总想通过WebForm2 wf=new WebForm2();DefaultImageFolder=wf.GetPath();这种声明方式去访问WebForm2的GetPath方法，但总是出现以下错误提示：找不到类型或命名空间名称“WebForm2”
根据他的提示我 在其中加入了对这个WEB项目的应用：

<%@ Import Namespace="Telegnosis.Projects.TeleOA.Web" %><%@ Import Namespace="Telegnosis.Projects.TeleOA.Web" %><%@ Import Namespace="Telegnosis.Projects.TeleOA.Web" %><%@ Import Namespace="TestYemMian" %><%@ Import Namespace="TestYemMian" %>

<%@ Import Namespace="Telegnosis.Projects.TeleOA.Web" %>

<%@ Import Namespace="Telegnosis.Projects.TeleOA.Web" %><%@ Import Namespace="Telegnosis.Projects.TeleOA.Web" %>运行通过了，还达到了我预想的要求，这还是我第一次这样用，所以跟大家分享下。
点击这里下载DEMO