动态添加用户控件

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。

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();    
    }
}

有了接口之后，需要创建用户控件Calculator.ascx: 

<%@ 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:

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：

 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#)

 http://download.cnblogs.com/insus/ASPDOTNET/DynamicallyLoadingUserControl.rar