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在aspx網頁裡動態載入UserControl,並且透過UserControl Event的訂閱,來取得對應的值

最近在小舖裡看到了這方面的問題....

小弟找了很多的資料..做一個範例介紹如何動態載入User Control

與如何透過aspx網頁訂閱User Control的Event,來取得相關的資訊

此範例先做一個檔案上傳的User Control,當網頁需要用到上傳功能時..

就可以將此控項制拉進來,,或用動態載入的方式來載入此控制項

所以此範例將會出現兩個User Control(一個是用拉的,一個是動態載入的)

當使用者選取好檔案,按upload時,aspx網頁就可以取得user control傳過來的檔案資訊

這樣一來以後就不用重覆寫上傳檔案的程式了,,只要拉一個user control就可以快速讓網頁有上傳的功能了

c#範例

User Control
WebUserControl.ascx

1 <%@  Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl.ascx.cs" Inherits="WebUserControl" %>
2 <asp:fileupload id="FileUpload1" runat="server" />
3 <asp:button id="btnUpload" runat="server" onclick="btnUpload_Click" text="upload" />
4



WebUserControl.ascx.cs

01 using System;
02 using System.Data;
03 using System.Configuration;
04 using System.Collections;
05 using System.Web;
06 using System.Web.Security;
07 using System.Web.UI;
08 using System.Web.UI.WebControls;
09 using System.Web.UI.WebControls.WebParts;
10 using System.Web.UI.HtmlControls;
11
12 public partial class WebUserControl : System.Web.UI.UserControl
13 {
14     //客制一個事件參數
15     public class MyEventArgs : EventArgs
16     {
17         string _FileName = string.Empty;
18         int _FileSize;
19
20         public string FileName
21         {
22             set { _FileName = value; }
23             get { return _FileName; }
24         }
25
26         public int FileSize
27         {
28             set { _FileSize = value; }
29             get { return _FileSize; }
30         }
31
32     }
33
34     public delegate void MyClick(object sender, MyEventArgs e);
35
36     public event MyClick cClick;
37
38     private void WebUserControl_Click(object sender, MyEventArgs e)
39     {
40         if (cClick != null)
41         {
42             cClick(sender, e);
43         }
44     }
45
46     protected void Page_Load(object sender, EventArgs e)
47     {
48
49     }
50     protected void btnUpload_Click(object sender, EventArgs e)
51     {
52         MyEventArgs EventArgs = new MyEventArgs();
53
54         EventArgs.FileName = this.FileUpload1.FileName;
55         EventArgs.FileSize = this.FileUpload1.PostedFile.ContentLength;
56         //上傳到upload資料夾裡
57         this.FileUpload1.SaveAs(Server.MapPath("~/upload/") + this.FileUpload1.FileName);
58
59         WebUserControl_Click(this, EventArgs);
60     }
61
62 }



aspx網頁
UserControl.aspx

01 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="UserControl.aspx.cs" Inherits="UserControl" %>
02
03 <%@ Register Src="WebUserControl.ascx" TagName="WebUserControl" TagPrefix="uc1" %>
04 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
05 <html xmlns="http://www.w3.org/1999/xhtml">
06 <head id="Head1" runat="server">
07     <title>UserControl</title>
08 </head>
09 <body>
10     <form id="form1" runat="server">
11         <div>
12             <uc1:WebUserControl ID="WebUserControl1" OncClick="WebUserControl1_cClick" runat="server" />
13         </div>
14     </form>
15 </body>
16 </html>
17


UserControl.aspx.cs

01 using System;
02 using System.Data;
03 using System.Configuration;
04 using System.Collections;
05 using System.Web;
06 using System.Web.Security;
07 using System.Web.UI;
08 using System.Web.UI.WebControls;
09 using System.Web.UI.WebControls.WebParts;
10 using System.Web.UI.HtmlControls;
11
12 public partial class UserControl : System.Web.UI.Page
13 {
14     protected void Page_Init(object sender, EventArgs e)
15     {
16         //動態加入UserControl
17         WebUserControl c = (WebUserControl)LoadControl("WebUserControl.ascx");
18         c.cClick += new WebUserControl.MyClick(c_cClick);
19         this.Page.Form.Controls.Add(c);
20     }
21
22     //動態加入UserControl的事件
23     void c_cClick(object sender, WebUserControl.MyEventArgs e)
24     {
25         Response.Write(e.FileName + "<br/>" + e.FileSize);
26     }
27
28     protected void Page_Load(object sender, EventArgs e)
29     {
30
31     }
32
33     //事先拉好的UserControl事件
34     //在UserControl.aspx裡有一個OncClick="WebUserControl1_cClick",就是對應到此事件
35     protected void WebUserControl1_cClick(object sender, WebUserControl.MyEventArgs e)
36     {
37         Response.Write(e.FileName + "<br/>" + e.FileSize);
38     }
39 }


執行結果：


參考網址：
http://www.thescripts.com/forum/thread232638.html

http://blog.blueshop.com.tw/jeff377/archive/2008/01/19/54090.aspx

http://www.blueshop.com.tw/board/show.asp?subcde=BRD20080224205358PAU&fumcde=FUM20041006161839LRJ&rplcnt=4

http://blog.xuite.net/cct0201/derek/15360068

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2008/3/16 23:42| 閱讀數 : 4530 | 我要推薦 | Add Comment | 文章分類 : ASP.NET 訂閱

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