如何在gridview中设置图片网址 [英] how to set image url in gridview

问题描述

我使用以下代码：

 <  < span class =code-leadattribute> asp：TemplateField     HeaderText   = 附件      ItemStyle-VerticalAlign   = 中     ItemStyle-Horizo​​ntalAlign   = 中心 >  
 <   ItemTemplate  >  
 <   asp：LinkBu tton     runat   =  server    ID   =  likattachment      CommandName   =  download    CommandArgument   ='  <％ #Eval（ 附件）％> ' >  
 <   img     src   =  ../ icon / paper-clip.png    style   =  border：0px;   < span class =code-attribute> id   =  image1    /  >  
 
 < span class =code-keyword><   / asp：LinkBut​​ton  >  
 <   / ItemTemplate  >  
 
 <   ItemStyle     Horizo​​ntalAlign   = 中心    VerticalAlign   =  中间 >  <   / ItemStyle  >  
 < ;   / asp：TemplateField  

和关于rowcommand事件我使用以下代码：

  protected   void  GridView1_RowCommand（ object  sender，GridViewCommandEventArgs e）
 {
  try  
 {
 LinkBut​​ton lik =（LinkBut​​ton）e.CommandSource; 
  if （lik.CommandName ==  下载）
 {
  string  filename =   + e.CommandArgument; 
  if （！string.IsNullOrEmpty（filename））
 {
 Response.Clear（）; 
 Response.AddHeader（  Content-Disposition，  attachment; filename = + filename）; 
  //   Response.AddHeader（Content-Length，file.Length.ToString（））;  
 Response.ContentType =   plain / text; 
 Response.TransmitFile（Server.MapPath（ 〜/ upload / + filename）） ; 
 
} 
  else  
 {
 Response.Write（ < script> alert（'No Attachment to download'）;< / script>）; 
} 
 
} 
} 
  catch （例外情况）
 {
} 
} 

现在我想显示那些记录的默认图像图标在附件中没有图像..还有附件显示在列表中但带有不同图标的记录..

我认为它将由gridview的RowDataBound事件完成我试过但我的问题没有解决

Plz建议我该怎么做..

提前谢谢..

解决方案

试试下面的代码...

1. 将 OnRowDataBound =GridView1_RowDataBound添加到 GridView aspx Page。
2. 在 Code Behind 页面中定义事件。
   
   

    受保护  void  GridView1_RowDataBound（ object 发件人，Gri dViewRowEventArgs e）
    {
    LinkBut​​ton lnkAttachment =（LinkBut​​ton）e.Row.FindControl（  likattachment ）; 
    
     if （！string.IsNullOrEmpty（lnkAttachment.CommandArgument.ToString（））
    {
     //  附件存在，做点什么。 
   } 
     else  
    {
     //  无附件，显示图标 
   } 
   } 

其他选项可以使用三元运算符，类似

 ImageUrl ='<％＃Eval（attachment）！= null？〜/ Images / Attachment.gif：〜/ Images / NoAttachment.gif％>'

I have use following code:

<asp:TemplateField HeaderText="Attachment"  ItemStyle-VerticalAlign="Middle" ItemStyle-HorizontalAlign="Center">
            <ItemTemplate>
                <asp:LinkButton runat="server" ID="likattachment"  CommandName="download" CommandArgument='<%#Eval("attachment") %>'>
                <img src="../icon/paper-clip.png" style="border:0px;" id="image1" />

                </asp:LinkButton>
           </ItemTemplate>

<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle>
            </asp:TemplateField

and on rowcommand event I have use following code:

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        try
        {
            LinkButton lik = (LinkButton)e.CommandSource;
            if (lik.CommandName == "download")
            {
                string filename = "" + e.CommandArgument;
                if (!string.IsNullOrEmpty(filename))
                {
                    Response.Clear();
                    Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
                    // Response.AddHeader("Content-Length", file.Length.ToString());
                    Response.ContentType = "plain/text";
                    Response.TransmitFile(Server.MapPath("~/upload/" + filename));

                }
                else
                {
                    Response.Write("<script>alert('No Attachment to download');</script>");
                }

            }
        }
        catch(Exception ex)
        {
        }
    }

Now I want to display default image icon for those records which has no image in attachment.. Also records with attachment display in list but with different icon..
I think it will done by RowDataBound event of gridview I tried but my problem is not solved
Plz suggest me what should do..
Thanks in advance..

解决方案

Try the below code...

1. Add OnRowDataBound="GridView1_RowDataBound" to GridView Markup in aspx Page.
2. Define the Event in Code Behind page.
   

   protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
   {
       LinkButton lnkAttachment = (LinkButton)e.Row.FindControl("likattachment");
   
       if (!string.IsNullOrEmpty(lnkAttachment.CommandArgument.ToString())
       {
           // Attachment exists, do something.
       }
       else
       {
           // No Attachments, show icon
       }
   }

Other option can be using Ternary Operator, Something like

ImageUrl='<%# Eval("attachment")!=null ? "~/Images/Attachment.gif" : "~/Images/NoAttachment.gif"%>'

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