master頁(yè)面的前臺(tái)
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:Panel ID="MasterPanel1" runat="server" GroupingText="主控頁(yè)面">
<asp:Button ID="MasterButton1" runat="server" Text="整頁(yè)更新" />
<asp:Button ID="MasterButton2" runat="server" Text="局部更新" OnClick="MasterButton2_Click" Width="128px" />
</asp:Panel>
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</div>
master頁(yè)面的后臺(tái)
protected void Page_Load(object sender, EventArgs e)
{
ScriptManager1.RegisterAsyncPostBackControl(MasterButton2);
}
public DateTime LastUpdate
{
get
{
if(ViewState["LastUpdate"] == null)
{
return DateTime.Now;
}
else
{
return Convert.ToDateTime(ViewState["LastUpdate"]);
}
}
set
{
ViewState["LastUpdate"] = value;
}
}
protected void MasterButton2_Click(object sender, EventArgs e)
{
LastUpdate = DateTime.Now;
UpdatePanel up1 = (UpdatePanel)(ContentPlaceHolder1.FindControl("UpdatePanel1"));
up1.Update();
} 注意這里因?yàn)橄Ｍ黜?yè)面的“局部更新”按鈕能引發(fā)異步更新內(nèi)容頁(yè)面中的UPDATEPANEL控件的內(nèi)容，因此必須用
ScriptManager1.RegisterAsyncPostBackControl(MasterButton2);
注冊(cè)該按鈕引發(fā)的事件。
要注意masterbutton2_click事件的寫法，調(diào)用內(nèi)容頁(yè)中的updatepanel控件的UPDATE方法來更新內(nèi)容。
然后在內(nèi)容頁(yè)中前臺(tái)中
<%@ Page Language="C#" MasterPageFile="~/ThirdMasterPage.master" AutoEventWireup="true"
CodeFile="CH3_DemoForm040.aspx.cs" Inherits="CH3_DemoForm040" Title="如何于主控頁(yè)面中使用 UpdatePanel 控件" %>
<%@ MasterType VirtualPath="ThirdMasterPage.master" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<asp:Panel ID="Panel2" GroupingText="內(nèi)容頁(yè)面" runat="server">
<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
<ContentTemplate>
<p>
上一次更新：<strong><%= Master.LastUpdate.ToString() %></strong></p>
<asp:Button ID="ContentButton" OnClick="ContentButton_Click" runat="server" Text="局部更新">
</asp:Button>
</ContentTemplate>
</asp:UpdatePanel>
</asp:Panel>
</asp:Content>
后臺(tái)中，為其“局部更新”編寫相關(guān)的事件，以將當(dāng)前日期時(shí)間給主控頁(yè)面的lastupdate屬性
protected void ContentButton_Click(object sender, EventArgs e)
{
Master.LastUpdate = DateTime.Now;
}
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