Repeater.OnItemDataBound(RepeaterItemEventArgs) 方法
定义
引发 ItemDataBound 事件。Raises the ItemDataBound event.
protected:
virtual void OnItemDataBound(System::Web::UI::WebControls::RepeaterItemEventArgs ^ e);
protected virtual void OnItemDataBound (System.Web.UI.WebControls.RepeaterItemEventArgs e);
abstract member OnItemDataBound : System.Web.UI.WebControls.RepeaterItemEventArgs -> unit
override this.OnItemDataBound : System.Web.UI.WebControls.RepeaterItemEventArgs -> unit
Protected Overridable Sub OnItemDataBound (e As RepeaterItemEventArgs)
参数
包含事件数据的 RepeaterItemEventArgs 对象。The RepeaterItemEventArgs object that contains the event data.
示例
下面的示例演示了一种处理控件的事件的方法 ItemDataBound Repeater 。The following example illustrates a way to handle the ItemDataBound event of the Repeater control. 在将数据绑定到控件中的某一项后, Repeater 但在页面上呈现这些数据之前,将修改该数据。The data is modified after it is bound to an item in the Repeater control but before it is rendered on the page.
<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>OnItemDataBound Example</title>
<script language="C#" runat="server">
void Page_Load(Object Sender, EventArgs e) {
if (!IsPostBack) {
ArrayList values = new ArrayList();
values.Add(new Evaluation("Razor Wiper Blades", "Good"));
values.Add(new Evaluation("Shoe-So-Soft Softening Polish", "Poor"));
values.Add(new Evaluation("DynaSmile Dental Fixative", "Fair"));
Repeater1.DataSource = values;
Repeater1.DataBind();
}
}
void R1_ItemDataBound(Object Sender, RepeaterItemEventArgs e) {
// This event is raised for the header, the footer, separators, and items.
// Execute the following logic for Items and Alternating Items.
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) {
if (((Evaluation)e.Item.DataItem).Rating == "Good") {
((Label)e.Item.FindControl("RatingLabel")).Text= "<b>***Good***</b>";
}
}
}
public class Evaluation {
private string productid;
private string rating;
public Evaluation(string productid, string rating) {
this.productid = productid;
this.rating = rating;
}
public string ProductID {
get {
return productid;
}
}
public string Rating {
get {
return rating;
}
}
}
</script>
</head>
<body>
<h3>OnItemDataBound Example</h3>
<form id="form1" runat="server">
<br />
<asp:Repeater id="Repeater1" OnItemDataBound="R1_ItemDataBound" runat="server">
<HeaderTemplate>
<table border="1">
<tr>
<td><b>Product</b></td>
<td><b>Consumer Rating</b></td>
</tr>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td> <asp:Label Text='<%# DataBinder.Eval(Container.DataItem, "ProductID") %>' Runat="server"/> </td>
<td> <asp:Label id="RatingLabel" Text='<%# DataBinder.Eval(Container.DataItem, "Rating") %>' Runat="server"/> </td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
<br />
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script language="VB" runat="server">
Sub Page_Load(Sender As Object, e As EventArgs)
If Not IsPostBack Then
Dim values As New ArrayList()
values.Add(New Evaluation("Razor Wiper Blades", "Good"))
values.Add(New Evaluation("Shoe-So-Soft Softening Polish", "Poor"))
values.Add(New Evaluation("DynaSmile Dental Fixative", "Fair"))
Repeater1.DataSource = values
Repeater1.DataBind()
End If
End Sub
Sub R1_ItemDataBound(Sender As Object, e As RepeaterItemEventArgs)
' This event is raised for the header, the footer, separators, and items.
' Execute the following logic for Items and Alternating Items.
If (e.Item.ItemType = ListItemType.Item) Or _
(e.Item.ItemType = ListItemType.AlternatingItem) Then
If CType(e.Item.DataItem, Evaluation).Rating = "Good" Then
CType(e.Item.FindControl("RatingLabel"), Label).Text = _
"<b>***Good***</b>"
End If
End If
End Sub
Public Class Evaluation
Private myProductid As String
Private myRating As String
Public Sub New(newProductid As String, newRating As String)
Me.myProductid = newProductid
Me.myRating = newRating
End Sub
Public ReadOnly Property ProductID() As String
Get
Return myProductid
End Get
End Property
Public ReadOnly Property Rating() As String
Get
Return myRating
End Get
End Property
End Class
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>OnItemDataBound Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>OnItemDataBound Example</h3>
<br />
<asp:Repeater id="Repeater1" OnItemDataBound="R1_ItemDataBound" runat="server">
<HeaderTemplate>
<table border="1">
<tr>
<td><b>Product</b></td>
<td><b>Consumer Rating</b></td>
</tr>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td> <asp:Label Text='<%# DataBinder.Eval(Container.DataItem, "ProductID") %>' Runat="server"/> </td>
<td> <asp:Label id="RatingLabel" Text='<%# DataBinder.Eval(Container.DataItem, "Rating") %>' Runat="server"/> </td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
<br />
</form>
</body>
</html>
注解
引发事件时,将通过委托调用事件处理程序。Raising an event invokes the event handler through a delegate. 有关如何处理事件的详细信息,请参阅 处理和引发事件。For more information about how to handle events, see Handling and Raising Events.
继承者说明
当 OnItemDataBound(RepeaterItemEventArgs) 在派生类中重写时,请确保调用基类的 OnItemDataBound(RepeaterItemEventArgs) 方法。When overriding OnItemDataBound(RepeaterItemEventArgs) in a derived class, be sure to call the base class's OnItemDataBound(RepeaterItemEventArgs) method.