Question

我在VS中的ASP.NET中有这个我在转发器中有图像按钮

<asp:Repeater ID="RepeaterImages" runat="server">
<ItemTemplate>
    <asp:ImageButton ID="Imagebutton2" runat="server"  CssClass="choicebutton" ImageUrl='<%#  DataBinder.Eval(Container.DataItem, "answer" )%>' CommandArgument='<%# DataBinder.Eval(Container.DataItem, "question" )%>' CommandName='<%#  DataBinder.Eval(Container.DataItem, "answer" )%>'    OnCommand="checkAnswer"  />
</ItemTemplate>
</asp:Repeater>

我想更改图像按钮的边框颜色为

public void checkAnswer(object sender, CommandEventArgs e)
{

    string trueanswer = e.CommandArgument.ToString();
    string urlanswer = e.CommandName.ToString();
    if (urlanswer == q_image)
    {
    }
    else
    {
      // Imagebutoon2 doesnt exist in current context why?
      Imagebutton2.BorderColor = Color.Red;
    }
}

Answer 1

您可以使用ItemDataBound执行此任务：

protected void RepeaterImages_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
     RepeaterItem item = e.Item;
     if ((item.ItemType == ListItemType.Item) || (item.ItemType == ListItemType.AlternatingItem))
     {
         Imagebutton  Imagebutton2= (Imagebutton)item.FindControl("Imagebutton2");

         string trueanswer = Imagebutton.CommandArgument.ToString();
         string urlanswer = Imagebutton.CommandName.ToString();

         if (urlanswer == q_image)
         {
         }
         else
         {
            // Imagebutoon2 doesnt exist in current context why?
            Imagebutton2.BorderColor = Color.Red;

         }

    }
}

不要忘记将其添加到转发器服务器标记：OnItemDataBound="RepeaterImages_ItemDataBound"

<强>更新

如果你想在点击图像按钮时发生这种情况，那就更简单了。您可以使用sender访问点击的图片按钮：

 public void checkAnswer(object sender, CommandEventArgs e)
 {
       ImageButton btn = (ImageButton)sender;

       string trueanswer = e.CommandArgument.ToString();
       string urlanswer = e.CommandName.ToString();
       if (urlanswer == q_image)
       {
       }
       else
       {
          // Imagebutoon2 doesnt exist in current context why?
          btn.BorderColor = Color.Red;

       }
  }

无法在OnCommand函数中调用Imagebutton

1 个答案: