本篇教你动态添加用户控件。
为了让用户控件能ASP.NET页面实现动态添加，首先写一个接口IGetUCable，这个接口有一个函数，返回对象类型是UserControl。
View Code using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; /// <summary> /// Summary description for IGetUCable /// </summary> namespace Insus.NET { public interface IGetUCable { UserControl GetUC(); } }
View Code <% @ Control Language = " C# " AutoEventWireup = " true " CodeFile = " Calculator.ascx.cs " Inherits = " Calculator " %> Number A: < asp:TextBox ID ="TextBox1" runat ="server" ></ asp:TextBox > < br /> + < br /> Number B: < asp:TextBox ID ="TextBox2" runat ="server" ></ asp:TextBox >< br /> < asp:Button ID ="ButtonEqual" runat ="server" Text ="=" OnClick ="ButtonEqual_Click1" /> < br /> Result: < asp:Label ID ="LabelResult" runat ="server" Text ="" ></ asp:Label >
Calculator.ascx.cs，cs实现接口:
View Code 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 Calculator : System.Web.UI.UserControl,IGetUCable { protected void Page_Load( object sender, EventArgs e) { } protected void ButtonEqual_Click1( object sender, EventArgs e) { decimal a = decimal.Parse( this.TextBox1.Text.Trim()); decimal b = decimal.Parse( this.TextBox2.Text.Trim()); this.LabelResult.Text = (a + b).ToString (); } public UserControl GetUC() { return this; } }
最后是在需要加载用户控件的aspx的Page_load事件写：
View Code protected void Page_Load( object sender, EventArgs e) { IGetUCable uc1 = (IGetUCable)LoadControl( " ~/Calculator.ascx "); this.form1.Controls.Add(uc1.GetUC()); }
用户控件加载之后运行效果：
源程序(.NET3.5 + ASP.NET + C#)