ASP.NET User Control.ascx

User controls can be used to implement reusable code in the page. It is a function that can be written in multiple places at one time and is easy to use. It is the simplest form of ASP.NET control encapsulation.

User controls: User controls contain a combination of html, code, and other Web or user controls, and are saved in their own file format on the Web server, with the extension *.ascx. There is no @Page directive in the user control, but the @Control directive is included, the user control cannot be run as a standalone file, an ASP.net page must be created and added later, the same XHTML elements and web server controls can be used on the user control, e.g. , Button can be placed in a user control and create event handlers for the button.

Note: UserControls can use other UserControls, but cannot contain themselves

Create the user control:

User controls start with @Control

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WebUserControl1.ascx.cs" Inherits="WebApplication1.WebUserControl1" %>

To use a user control in a webform, simply drag and drop the user control into the webform. At this point, the webform has the following code:

<%@ Register src="WebUserControl1.ascx" tagname="WebUserControl1" tagprefix="uc1" %>

If you need multiple pages, you can register the user control once in the configuration file Web.config.

Using user controls:

Drag the user control file .ascx onto the web page you want to use and set the properties.

UserControl.ascx page:

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WebUserControl1.ascx.cs" Inherits="WebApplication1.WebUserControl1" %>
<asp:TextBox ID="TextBox1" runat="server" BorderColor="Pink"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="你好吗" BorderColor="Pink" />

C# code:

        protected void Page_Load(object sender, EventArgs e)
        {
            Response.Write(TextBox1.Text);
        }

        public string Text
        {
            get
            {
                return TextBox1.Text;
            }
            set
            {
                TextBox1.Text = value;
            }
        }
        public void forecolor(Color color)
        {
                TextBox1.ForeColor=color;
                Button1.BackColor=color;
        }

webform.aspx page:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>

<%@ 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>
        <uc1:WebUserControl1 ID="WebUserControl11" runat="server" Text="你好吗" />
    </div>
    </form>
</body>
</html>

show:

The basic way a web page calls a user control:

<uc1:WebUserControl1 ID="WebUserControl11" runat="server" Text="你好吗" />

User controls are generally used for pages that are all used controls and that are repeated a lot.

ASP.NET User Control.ascx

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