RaisePostBackEvent(string eventArgument)
说明:回调方法
参数:eventArgument,返回客户端回调参数值
Page.ClientScript.GetPostBackEventReference(control,string)
说明:客户端指定页面control控件中使用string字符串,以便回调回服务器
参数:control,实现PostBackOptions类,如控件,一般用this
string,指定字符串值
示例:
类文件:
using
System;
using
System.Web.UI;
using
System.Collections;
using
System.Collections.Specialized;
namespace
CustomControls
{
public
class
MyButton : Control, IPostBackEventHandler
{
private
int
i
=
0
;
//
回调函数,回调参数值:eventArgument
public
void
RaisePostBackEvent(
string
eventArgument)
{
Context.Response.Write(
"
第
"
+
eventArgument
+
"
次点击
"
);
i
=
int
.Parse(eventArgument);
}
//
控件呈现,Control类重写,传送参数至客户端
protected
override
void
Render(HtmlTextWriter output)
{
output.Write(
"
<input type=\
"
button\
"
name =
"
+
this
.UniqueID
+
"
Value = 'Click Me' onclick=\
"
javascript:
"
+Page.ClientScript.GetPostBackEventReference(this,(i+1).ToString())+
"
\
"
/>
"
);
}
}
}
调用控件页面:
<%
@ Register TagPrefix
=
"
CustomControl
"
Namespace
=
"
CustomControls
"
%>
<!
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
runat
="server"
>
<
title
>
无标题页
</
title
>
</
head
>
<
body
>
<
form
id
="form1"
runat
="server"
>
<
div
>
<
CustomControl:MyButton
runat
="server"
ID
="Button"
>
</
CustomControl:MyButton
>
</
div
>
</
form
>
</
body
>
</
html
>
注:
当UseSubmitBehavior 属性为 false 时,GetPostBackEventReference方法可以与Button控件一起使用
<%
@ Register TagPrefix
=
"
CustomControl
"
Namespace
=
"
CustomControls
"
%>
注册使用自定义控件,TagPrefix指定控件前缀,Namespace指定控件所在命名空间
调用自定义控件则如下
<TagPrefix指定名称:自定义控件类名></TagPrefix指定名称:自定义控件类名>