Http://hi.baidu.com/isbx/blog/item/85df08f7ca0fb12a730eec06.html Web
User ControlThe control must be associated with its parent page.
Interaction.
InteractionThere are many different types. Viewstate, session, and even static variables can be used. However, sometimes, when the control triggers a return, the event must be used for processing. Speaking of events, it does not mean that the Web
User ControlInternally, these buttons or linkbuttons are used to trigger a callback event.
User ControlAs a whole object, it has its own attributes, methods, and events. When
User ControlWhen embedded into a page file, it is hidden internally. However, it opens its own attributes, methods, and events. When an internal callback is triggered, it varies depending on the status of the callback, it determines whether to send this back to the parent page of the notification. At the same time, the parent page can know what information the child control can provide.
With the event, you can
User ControlAll the information is transmitted to the parent page through eventargs, and then the parent page is processed based on the information. First, we will define an eventargs class. Assume that
User ControlContains three child controls, two text boxes, and one button. This button triggers the return event of the control. After the control is returned, it should tell the parent page that it can provide the content of the two text boxes, such as username and password. Create a class file in the business logic layer and create the usercontroleventtest class. Namespace sysu. XK
{
Publicclass usercontroleventtest: eventargs
{
Publicstring username;
Publicstring password;
Public usercontroleventtest (string username, string password)
{
This. Username = username;
This. Password = password;
}
}
} Then
User ControlThe code file defines a delegate and adds the event, and then fires the event after the button is clicked:
Using sysu. XK;
Public partial class webusercontrolevent: system. Web. UI. usercontrol
{
Publicdelegatevoid submituserhandler (Object sender, usercontroleventtest E );
Publicevent submituserhandler submituserevent;
Protectedvoid page_load (Object sender, eventargs E)
{
}
Protectedvoid button#click (Object sender, eventargs E)
{
Usercontroleventtest = new usercontroleventtest (textbox1.text, textbox2.text );
Submituserevent (this, usercontroleventtest );
}
}
In this way,User ControlAdd a submit event and handle it: <% @ register tagprefix = "usercontrol" tagname = "Event" src = "~ /Webusercontrolevent. ascx "%>
<Usercontrol: Event id = "event1" runat = "server" onsubmituserevent = "event1_submit"> </usercontrol: Event>
Protectedvoid event1_submit (Object sender, usercontroleventtest E)
{
String username = E. Username;
String Password = E. Password;
Label1.text = username;
Label2.text = password;
} The effect is as follows:
Reference: http://www.cnblogs.com/Freedream/archive/2006/06/26/435786.html
Download Code: http: // 202.116.83.77/hope/sites/XK/share/uctest.rar
