用戶控件(UserControl) 使用事件

用戶控件上有一個下拉式菜單(DropDownList)和一個Button按鈕，想實現(xiàn)選擇下拉式菜單并點按鈕，它會把下拉式菜單選中的Text和value分別賦值給aspx頁面的Hyperlink的Text和NavigateUrl。

實現(xiàn)方法應(yīng)該很多，此次，Insus.NET使用了委托(delegate)和事件(event)來實現(xiàn)。首先看看效果演示：

InsusEventArgs.cs:

InsusEventArgs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

/// <summary>
/// Summary description for InsusEventArgs
/// </summary>
namespace Insus.NET
{
    public class InsusEventArgs : EventArgs
    {
        private string _Text;

        public string Text
        {
            get
            {
                return _Text;
            }
            set
            {
                _Text = value;
            }
        }
        private string _Url;

        public string Url
        {
            get
            {
                return _Url;
            }
            set
            {
                _Url = value;
            }
        }

        public InsusEventArgs(string text, string url)
        {
            this._Text = text;
            this._Url = url;
        }
    }
}

用戶控件InsusUserControl.ascx:

InsusUserControl.ascx

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="InsusUserControl.ascx.cs"
    Inherits="InsusUserControl" %>
Web site navigate<br />
<asp:DropDownList ID="DropDownList1" runat="server">
    <asp:ListItem Text="Insus.NET blog" Value="http://insus.cnblogs.com"></asp:ListItem>
    <asp:ListItem Text="Microsoft" Value="http://www.microsoft.com"></asp:ListItem>
    <asp:ListItem Text="Google" Value="http://www.google.com"></asp:ListItem>
</asp:DropDownList>
<br />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Transform" />

InsusUserControl.ascx.cs:

InsusUserControl.ascx.cs

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 InsusUserControl : System.Web.UI.UserControl
{
    //宣告一個委托,注意一下另一個參數(shù)是使用InsusEventArgs
    public delegate void TransformProgress(object sender, InsusEventArgs e);

    //宣告一個事件
    public event TransformProgress Transform;

    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        //如果下拉式菜單什么都不選時，return
        if (this.DropDownList1.SelectedIndex == -1) return;

        string text = this.DropDownList1.SelectedItem.Text;
        string url = this.DropDownList1.SelectedItem.Value;

        //實現(xiàn)事件
        this.Transform(this, new InsusEventArgs(text, url));
    }
}

網(wǎng)頁Default.aspx:

Default.aspx

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

<%@ Register Src="InsusUserControl.ascx" TagName="InsusUserControl" 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">
    <uc1:InsusUserControl ID="InsusUserControl1" runat="server" OnTransform="InsusUserControl1_Transform" />
    <p />
    <asp:HyperLink ID="HyperLink1" runat="server"></asp:HyperLink>
    </form>
</body>
</html>

Default.aspx.cs:

Default.aspx.cs

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
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void InsusUserControl1_Transform(object sender, InsusEventArgs e)
    {
        this.HyperLink1.Text = e.Text;
        this.HyperLink1.NavigateUrl = e.Url;
    }
}

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用戶控件(UserControl) 使用事件