除了將公共字段提升爲控件屬性外，還可以使用屬性語法。屬性語法具有能夠在設置或檢索屬性時執行代碼的優點。下面的示例說明一個 Address 用戶控件，該控件在內部包裝了 TextBox 控件的文本屬性。這樣做的優點是控件可以無償繼承 TextBox 控件的自動狀態管理功能。
注意，在包含 Web 窗體的頁上有兩個 Address 用戶控件，它們分別將 Caption 屬性設置爲“Billing Address”和“Shipping Address”。用戶控件的真正威力在於這種可重用性。
調用面前臺: Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Src="myuc.ascx" TagName="myuc" 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>無標題頁</title></head><body> <form id="form1" runat="server"> <div> <uc1:myuc id="ShipAddr" runat="server" Caption="發貨地址" Address="浙江省寧波市" City="寧波" State="浙江" Zip="315000"> </uc1:myuc> <br /> <br /> <uc1:myuc id="BillAddr" runat="server" Caption="收貨地址"> </uc1:myuc><br /> <br /> <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="確定" /><br /> <br /> <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br /> <br /> </div> </form></body></html>
調用面前臺: Default.aspx.cs
using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;public partial class _Default : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e)
{
//if(!Page.IsPostBack) //{ Label1.Text = ""; //}
} protected void Button1_Click(object sender, EventArgs e) { Label1.Text += "<b>發貨地址：</b>" + ShipAddr.Address + "," + ShipAddr.City + "," + ShipAddr.State + "," + ShipAddr.Zip + "<p>"; Label1.Text += "<b>帳單地址：</b>" + BillAddr.Address+"," + BillAddr.City + "," + BillAddr.State + "," + BillAddr.Zip + "<p>"; }
}
用戶自定義控件前臺: myuc.ascx
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="myuc.ascx.cs" Inherits="myuc" %><asp:Label ID="Label1" runat="server" Text="<%=Caption %>"></asp:Label><br /><asp:Label ID="Label5" runat="server" Text="地址："></asp:Label><asp:TextBox ID="txtAddress" runat="server" Width="465px"></asp:TextBox><br /><asp:Label ID="Label2" runat="server" Text="城市："></asp:Label><asp:TextBox ID="txtCity" runat="server" Width="104px"></asp:TextBox> <asp:Label ID="Label3" runat="server" Text="州："></asp:Label><asp:TextBox ID="txtState" runat="server" Width="87px"></asp:TextBox><asp:Label ID="Label4" runat="server" Text="郵政編碼："></asp:Label><asp:TextBox ID="txtZip" runat="server" Width="142px"></asp:TextBox>
用戶自定義控件前臺: myuc.ascx.cs
using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;public partial class myuc : System.Web.UI.UserControl{ protected void Page_Load(object sender, EventArgs e) { } //定義屬性 public string Caption="地址"; public string Address { get{ return txtAddress.Text; } set{ txtAddress.Text = value; } } public string City { get { return txtCity.Text; } set{ txtCity.Text = value; } } public string State { get { return txtState.Text; } set { txtState.Text = value; } } public string Zip { get { return txtZip.Text; } set { txtZip.Text = value; } }}
