Question

我有這個在ASP.NET中VS 我在直放站

<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> 

圖像按鈕，我想改變圖像按鈕的邊框顏色當它是假的

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此任務：

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; 

     } 

    } 
} 

不要忘了它添加到中繼器服務器標籤：OnItemDataBound="RepeaterImages_ItemDataBound"

UPDATE

如果你想點擊的ImageButton當這種情況發生，那麼它就更簡單了。您可以使用sender訪問的ImageButton點擊：

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; 

     } 
    }