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The value of two custom controls and the application of interfaces

Source: Internet
Author: User
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"Two user controls are used in A. aspx page. The user control A has A button, and the textbox value in control B is obtained when you click it.

Because the name will change during generation, how should I write the findcontrol name?
In addition, are there several solutions to such problems ?"

Insus. NET provides its own solution to this problem on the Forum. Let's take a look at the solution:

First, create a site, and then create two user controls: UcA and UcB. Pull a TextBox on The UcB control.Copy codeThe Code is as follows: <% @ Control Language = "C #" AutoEventWireup = "true" CodeFile = "UcB. ascx. cs" Inherits = "UcB" %>
<Asp: TextBox ID = "TextBox1" runat = "server"> </asp: TextBox>

Create an interface IGetValue:Copy codeThe Code is as follows: IGetValue. cs
Using System;
Using System. Collections. Generic;
Using System. Linq;
Using System. Web;
/// <Summary>
/// Summary description for IGetValue
/// </Summary>
Namespace Insus. NET
{
Public interface IGetValue
{
String GetValue ();
}
}

Next, the user control UcB implements this interface, and the interface returns the Text value of TextBox.Copy codeThe Code is as follows: using System;
Using System. Collections. Generic;
Using System. Linq;
Using System. Web;
Using System. Web. UI;
Using System. Web. UI. WebControls;
Using Insus. NET;
Public partial class UcB: System. Web. UI. UserControl, IGetValue
{
Protected void Page_Load (object sender, EventArgs e)
{
}
Public string GetValue ()
{
Return this. TextBox1.Text. Trim ();
}
}

Create An aspx page, such as Default. aspx, switch to the design mode, and pull the two user controls UcA and UcB to Default. aspx:Copy codeThe Code is as follows: <% @ Page Language = "C #" AutoEventWireup = "true" CodeFile = "Default. aspx. cs" Inherits = "_ Default" %>
<% @ Register Src = "UcA. ascx" TagName = "UcA" TagPrefix = "uc1" %>
<% @ Register Src = "UcB. ascx" TagName = "UcB" TagPrefix = "uc2" %>
<! DOCTYPE html>
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> </title>
</Head>
<Body>
<Form id = "form1" runat = "server">
<Fieldset>
<Legend> UcA
</Legend>
<Uc1: UcA ID = "UcA1" runat = "server"/>
</Fieldset>
<Fieldset>
<Legend> UcB
</Legend>
<Uc2: UcB ID = "UcB1" runat = "server"/>
</Fieldset>
</Form>
</Body>
</Html>

Create an Interface to obtain the UcB user control.Copy codeThe Code is as follows: IGetUserControl. cs
Using System;
Using System. Collections. Generic;
Using System. Linq;
Using System. Web;
Using System. Web. UI;
/// <Summary>
/// Summary description for IGetUserControl
/// </Summary>
Namespace Insus. NET
{
Public interface IGetUserControl
{
UserControl GetUc ();
}
}

After the interface is created, implement the IGetUserControl interface in Default. aspx. cs.Copy codeThe Code is as follows: using System;
Using System. Collections. Generic;
Using System. Linq;
Using System. Web;
Using System. Web. UI;
Using System. Web. UI. WebControls;
Using Insus. NET;
Public partial class _ Default: System. Web. UI. Page, IGetUserControl
{
Protected void Page_Load (object sender, EventArgs e)
{
}
Public UserControl GetUc ()
{
Return this. UcB1;
}
}

At the end, we write the button Click event in the UcA user control:Copy codeThe Code is as follows: using System;
Using System. Collections. Generic;
Using System. Linq;
Using System. Web;
Using System. Web. UI;
Using System. Web. UI. WebControls;
Using Insus. NET;
Public partial class UcA: System. Web. UI. UserControl
{
Protected void Page_Load (object sender, EventArgs e)
{
}
Protected void button#click (object sender, EventArgs e)
{
IGetUserControl ucb = (IGetUserControl) this. Page;
IGetValue value = (IGetValue) ucb. GetUc ();
Response. Write ("<scr" + "ept> alert ('" + value. GetValue () + "') </scr" + "ERT> ");
}
}

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