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 "   %>

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

转载于:https://www.cnblogs.com/gjahead/archive/2007/04/25/727027.html