1. Simple instances
First, create a "web user control" WebUserControl1.ascx,
Add a button on the page and respond to the Click event:
[Csharp] <asp: Button ID = "Button1" runat = "server" Text = "enter a random number" onclick = "button#click"/>
<Asp: Button ID = "Button1" runat = "server" Text = "enter a random number" onclick = "button#click"/>
Then write the background code:
[Csharp] // defines a non-data event processing method
Public event EventHandler Click;
Protected void button#click (object sender, EventArgs e)
{
Click (this, EventArgs. Empty );
}
// Define a non-data event processing method
Public event EventHandler Click;
Protected void button#click (object sender, EventArgs e)
{
Click (this, EventArgs. Empty );
}
Now we have finished the user control. Create a WebForm1.aspx page, add a Textbox to the page, and add the user control to the page:
[Html] <% @ Register src = "WebUserControl1.ascx" tagname = "WebUserControl1" tagprefix = "uc1" %>
<! 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> </title>
</Head>
<Body>
<Form id = "form1" runat = "server">
<Div>
<Asp: TextBox ID = "TextBox1" runat = "server"> </asp: TextBox>
<Br/>
<Uc1: WebUserControl1 ID = "WebUserControl11" runat = "server"/>
</Div>
</Form>
</Body>
</Html>
<% @ Register src = "WebUserControl1.ascx" tagname = "WebUserControl1" tagprefix = "uc1" %>
<! 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> </title>
</Head>
<Body>
<Form id = "form1" runat = "server">
<Div>
<Asp: TextBox ID = "TextBox1" runat = "server"> </asp: TextBox>
<Br/>
<Uc1: WebUserControl1 ID = "WebUserControl11" runat = "server"/>
</Div>
</Form>
</Body>
</Html>
Then, we add a function response to the user control event in the background. The Code is as follows:
[Csharp] protected void Page_Load (object sender, EventArgs e)
{
WebUserControl11.Click + = new EventHandler (WebUserControl11_Click );
}
Void WebUserControl11_Click (object sender, EventArgs e)
{
TextBox1.Text = new Random (). Next (1000,999 9). ToString ();
}
Protected void Page_Load (object sender, EventArgs e)
{
WebUserControl11.Click + = new EventHandler (WebUserControl11_Click );
}
Void WebUserControl11_Click (object sender, EventArgs e)
{
TextBox1.Text = new Random (). Next (1000,999 9). ToString ();
}
At this point, our example is complete. In aspx, we can capture user control events and do what we want to do.
2. example with event data
Of course, sometimes we not only want to capture events on the aspx page, but also want to get some parameters. At this time, EventArgs will need to appear.
First, create a web user control WebUserControl2.ascx
Add two buttons on the page to respond to the Click event respectively, as shown below:
[Html] <asp: Button ID = "Button1" runat = "server" Text = "Modify the page title to edit"
Onclick = "button#click"/>
<Asp: Button ID = "Button2" runat = "server" Text = "Modify the page title to add"
Onclick = "Button2_Click"/>
<Asp: Button ID = "Button1" runat = "server" Text = "Modify the page title to edit"
Onclick = "button#click"/>
<Asp: Button ID = "Button2" runat = "server" Text = "Modify the page title to add"
Onclick = "Button2_Click"/>
C # code: First add a class ChangePageTitleEventArgs to pass event data. The Code is as follows:
[Csharp] public class ChangePageTitleEventArgs: EventArgs
{
Public ChangePageTitleEventArgs (string title)
{
This. Title = title;
}
Public string Title
{
Get;
Private set;
}
}
Public class ChangePageTitleEventArgs: EventArgs
{
Public ChangePageTitleEventArgs (string title)
{
This. Title = title;
}
Public string Title
{
Get;
Private set;
}
}
Then we will compile the background code of the user control:
[Csharp] public event EventHandler <ChangePageTitleEventArgs> ChangePageTitle;
Protected void button#click (object sender, EventArgs e)
{
ChangePageTitle (this, new ChangePageTitleEventArgs ("edit "));
}
Protected void Button2_Click (object sender, EventArgs e)
{
ChangePageTitle (this, new ChangePageTitleEventArgs ("new "));
}
Public event EventHandler <ChangePageTitleEventArgs> ChangePageTitle;
Protected void button#click (object sender, EventArgs e)
{
ChangePageTitle (this, new ChangePageTitleEventArgs ("edit "));
}
Protected void Button2_Click (object sender, EventArgs e)
{
ChangePageTitle (this, new ChangePageTitleEventArgs ("new "));
}
The code of the user control is OK. Then we create a WebForm2.aspx page to add the user control to this page.
[Csharp] <% @ Register src = "WebUserControl2.ascx" tagname = "WebUserControl2" tagprefix = "uc1" %>
<! 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> </title>
</Head>
<Body>
<Form id = "form1" runat = "server">
<Uc1: WebUserControl2 ID = "WebUserControl21" runat = "server"/>
</Form>
</Body>
</Html>
<% @ Register src = "WebUserControl2.ascx" tagname = "WebUserControl2" tagprefix = "uc1" %>
<! 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> </title>
</Head>
<Body>
<Form id = "form1" runat = "server">
<Uc1: WebUserControl2 ID = "WebUserControl21" runat = "server"/>
</Form>
</Body>
</Html>
Compile the background code and add the processing function for the time of the user control:
[Csharp] protected void Page_Load (object sender, EventArgs e)
{
WebUserControl21.ChangePageTitle + = new EventHandler <ChangePageTitleEventArgs> (WebUserControl21_ChangePageTitle );
}
Void WebUserControl21_ChangePageTitle (object sender, ChangePageTitleEventArgs e)
{
This. Page. Title = e. Title;
}
Protected void Page_Load (object sender, EventArgs e)
{
WebUserControl21.ChangePageTitle + = new EventHandler <ChangePageTitleEventArgs> (WebUserControl21_ChangePageTitle );
}
Void WebUserControl21_ChangePageTitle (object sender, ChangePageTitleEventArgs e)
{
This. Page. Title = e. Title;
}
Now, we have completed the code and run the test. The effect is as follows:
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