ASP.NET调用UpdatePanel的Update()方法
创始人
2024-04-18 12:21:04
0次
ASP.NET中用编程的方法控制UpdatePanel的更新
UpdatePanel可以用来创建丰富的局部更新Web应用程序，它是ASP.NET 2.0 AJAX Extensions中很重要的一个控件。对于UpdatePanel，我们也可以使用编程的方法来控制它的更新，可以通过ScriptManager的RegisterAsyncPostBackControl()方法注册一个异步提交的控件，并且调用UpdatePanel的Update()方法来让它更新。再次用我在前面的文章中用到的一个无聊的时间更新例子来看一下，有时候我觉得例子过于复杂更加不好说明白所要讲的内容，如下代码所示，注意Button1并不包含在UpdatePanel中：
- <%@PageLanguage="C#"AutoEventWireup="true"CodeFile="Default
.aspx.cs"Inherits="_Default"%>- <scriptrunatscriptrunat="server">
- voidButton1_Click(objectsender,EventArgse)
- {
- this.Label2.Text=DateTime.Now.ToString();
- }
- script>
- <htmlxmlnshtmlxmlns="http://www.w3.org/1999/xhtml">
- <headrunatheadrunat="server">
</FONT></STRONG>RefreshinganUpdatePanelProgrammatically<STRONG><FONT color=#006699></< SPAN>title></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699></< SPAN>head></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699><body></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>formid</FONT><STRONG><FONT color=#006699>formid</FONT></STRONG>="form1"<FONT color=#0000ff>runat</FONT>="server"<STRONG><FONT color=#006699>></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>asp:ScriptManagerID</FONT><STRONG><FONT color=#006699>asp:ScriptManagerID</FONT></STRONG>="ScriptManager1<BR>"<FONT color=#0000ff>runat</FONT>="server"<STRONG><FONT color=#006699>/></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><div></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>asp:UpdatePanelID</FONT><STRONG><FONT color=#006699>asp:UpdatePanelID</FONT></STRONG>="UpdatePanel1"<FONT color=#0000ff>runat</FONT>=<BR>"server"<FONT color=#ff0000>UpdateMode</FONT>=<FONT color=#0000ff>"Conditional"</FONT><STRONG><FONT color=#006699>></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><ContentTemplate></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>asp:LabelID</FONT><STRONG><FONT color=#006699>asp:LabelID</FONT></STRONG>="Label1"<FONT color=#0000ff>runat</FONT>="server"<FONT color=#ff0000>Text</FONT>=<BR><FONT color=#0000ff>"更新时间："</FONT><STRONG><FONT color=#006699>></< SPAN>asp:Label></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>asp:LabelID</FONT><STRONG><FONT color=#006699>asp:LabelID</FONT></STRONG>="Label2"<FONT color=#0000ff>runat</FONT>="server"<FONT color=#ff0000>Text</FONT>=<BR>"Label"<FONT color=#0000ff>ForeColor</FONT>="Red"<STRONG><FONT color=#006699>></< SPAN>asp:Label><br/><br/></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699></< SPAN>ContentTemplate></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699></< SPAN>asp:UpdatePanel></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>asp:ButtonID</FONT><STRONG><FONT color=#006699>asp:ButtonID</FONT></STRONG>="Button1"<FONT color=#0000ff>runat</FONT>="server"<FONT color=#ff0000>Text</FONT>=<BR>"Button"<FONT color=#0000ff>OnClick</FONT>="Button1_Click"<STRONG><FONT color=#006699>/></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699></< SPAN>div></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699></< SPAN>form></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699></< SPAN>body></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699></< SPAN>html></FONT></STRONG> </LI></OL></PRE> <P>再次修改上面的例子，使用ScriptManager的RegisterAsyncPostBackControl()注册Button1为一个异步提交控件，并且调用UpdatePanel的Update()方法：</P> <P> </P><PRE><OL class=dp-xml><LI class=alt><STRONG><FONT color=#006699><</FONT></STRONG>%@<FONT color=#ff0000>PageLanguage</FONT>="C#"<FONT color=#0000ff>AutoEventWireup</FONT>="true"<FONT color=#ff0000>CodeFile</FONT>="Default.aspx.cs"<BR><FONT color=#0000ff>Inherits</FONT>="_Default"%<STRONG><FONT color=#006699>></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>scriptrunat</FONT><STRONG><FONT color=#006699>scriptrunat</FONT></STRONG>=<FONT color=#0000ff>"server"</FONT><STRONG><FONT color=#006699>></FONT></STRONG> <LI class=alt>voidPage_Load(objectsender,EventArgse) <LI class="">{ <LI class=alt>ScriptManager1.RegisterAsyncPostBackControl(Button1); <LI class="">} <LI class=alt>voidButton1_Click(objectsender,EventArgse) <LI class="">{ <LI class=alt><FONT color=#ff0000>this.Label2.Text</FONT>=<FONT color=#0000ff>DateTime</FONT>.Now.ToString(); <LI class="">this.UpdatePanel1.Update(); <LI class=alt>} <LI class=""><STRONG><FONT color=#006699></< SPAN>script></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>htmlxmlns</FONT><STRONG><FONT color=#006699>htmlxmlns</FONT></STRONG>=<FONT color=#0000ff>"http://www.w3.org/1999/xhtml"</FONT><STRONG><FONT color=#006699>></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>headrunat</FONT><STRONG><FONT color=#006699>headrunat</FONT></STRONG>=<FONT color=#0000ff>"server"</FONT><STRONG><FONT color=#006699>></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><title></FONT></STRONG>RefreshinganUpdatePanelProgrammatically<STRONG><FONT color=#006699></< SPAN>title></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699></< SPAN>head></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><body></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>formid</FONT><STRONG><FONT color=#006699>formid</FONT></STRONG>="form1"<FONT color=#0000ff>runat</FONT>="server"<STRONG><FONT color=#006699>></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>asp:ScriptManagerID</FONT><STRONG><FONT color=#006699>asp:ScriptManagerID</FONT></STRONG>="ScriptManager1"<FONT color=#0000ff>runat</FONT>="server"<STRONG><FONT color=#006699>/></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699><div></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>asp:UpdatePanelID</FONT><STRONG><FONT color=#006699>asp:UpdatePanelID</FONT></STRONG>="UpdatePanel1"<FONT color=#0000ff>runat</FONT>=<BR>"server"<FONT color=#ff0000>UpdateMode</FONT>=<FONT color=#0000ff>"Conditional"</FONT><STRONG><FONT color=#006699>></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699><ContentTemplate></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>asp:LabelID</FONT><STRONG><FONT color=#006699>asp:LabelID</FONT></STRONG>="Label1"<FONT color=#0000ff>runat</FONT>="server"<FONT color=#ff0000>Text</FONT>=<FONT color=#0000ff>"更新时间："</FONT><STRONG><FONT color=#006699>></< SPAN>asp:Label></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>asp:LabelID</FONT><STRONG><FONT color=#006699>asp:LabelID</FONT></STRONG>="Label2"<FONT color=#0000ff>runat</FONT>="server"<FONT color=#ff0000>Text</FONT>="Label"<FONT color=#0000ff>ForeColor<BR></FONT>="Red"<STRONG><FONT color=#006699>></< SPAN>asp:Label><br/><br/></FONT></STRONG> <LI class=alt> <LI class=""><STRONG><FONT color=#006699></< SPAN>ContentTemplate></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699></< SPAN>asp:UpdatePanel></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699><</FONT></STRONG><FONT color=#ff0000>asp:ButtonID</FONT><STRONG><FONT color=#006699>asp:ButtonID</FONT></STRONG>="Button1"<FONT color=#0000ff>runat</FONT>="server"<FONT color=#ff0000>Text</FONT>=<BR>"Button"<FONT color=#0000ff>OnClick</FONT>="Button1_Click"<STRONG><FONT color=#006699>/></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699></< SPAN>div></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699></< SPAN>form></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699></< SPAN>body></FONT></STRONG> <LI class=""><STRONG><FONT color=#006699></< SPAN>html></FONT></STRONG> </LI></OL></PRE> <P>以上是ASP.NET调用UpdatePanel的Update()方法</P> <P>【编辑推荐】</P> <OL> <LI><FONT color=#0000ff>浅谈ASP.NET访问数据</FONT></LI> <LI><FONT color=#0000ff>ASP.NET运行时的处理流程</FONT></LI> <LI><FONT color=#0000ff>概述ASP.NET MVC与FubuMVC核心框架</FONT></LI> <LI><FONT color=#0000ff>ASP.NET framework的处理方法</FONT></LI> <LI><FONT color=#0000ff>浅析ASP.NET安全架构</FONT></LI></OL> <!--end::Text--> </div> <!--end::Description--> <div class="mt-5"> <!--关键词搜索--> </div> <div class="mt-5"> <p class="fc-show-prev-next"> <strong>上一篇：</strong><a href="/chengxu/15657.html">快速防护能否应对零日攻击？微软力推Fix-it技术</a><br> 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