转: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" />
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WebUserControl.ascx.cs


1	using System;
2	using System.Data;
3	using System.Configuration;
4	using System.Collections;
5	using System.Web;
6	using System.Web.Security;
7	using System.Web.UI;
8	using System.Web.UI.WebControls;
9	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	}
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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 WebUserControl : System.Web.UI.UserControl
{
//客制一個事件參數
public class MyEventArgs : EventArgs
{
string _FileName = string.Empty;
int _FileSize;
public string FileName
{
set { _FileName = value; }
get { return _FileName; }
}
public int FileSize
{
set { _FileSize =value; }
get { return _FileSize; }
}
}
public delegate void MyClick(object sender, MyEventArgs e);
public event MyClick cClick;
private void WebUserControl_Click(object sender, MyEventArgs e)
{
if (cClick != null)
{
cClick(sender, e);
}
}
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnUpload_Click(object sender, EventArgs e)
{
MyEventArgs EventArgs = new MyEventArgs();
EventArgs.FileName = this.FileUpload1.FileName;
EventArgs.FileSize = this.FileUpload1.PostedFile.ContentLength;
//上傳到upload資料夾裡
this.FileUpload1.SaveAs(Server.MapPath("~/upload/") + this.FileUpload1.FileName);
WebUserControl_Click(this, EventArgs);
}
}

aspx網頁
UserControl.aspx


1	<%@ Page Language="C#" AutoEventWireup="true" CodeFile="UserControl.aspx.cs" Inherits="UserControl" %>
2
3	<%@ Register src="WebUserControl.ascx" TagName="WebUserControl" TagPrefix="uc1" %>
4
5	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
6
7	<html xmlns="http://www.w3.org/1999/xhtml" >
8	<head runat="server">
9	<title>UserControl</title>
10	</head>
11	<body>
12	<form id="form1" runat="server">
13	<div>
14	<uc1:WebUserControl ID="WebUserControl1" OncClick="WebUserControl1_cClick" runat="server" />
15	</div>
16	</form>
17	</body>
18	</html>
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UserControl.aspx.cs


1	using System;
2	using System.Data;
3	using System.Configuration;
4	using System.Collections;
5	using System.Web;
6	using System.Web.Security;
7	using System.Web.UI;
8	using System.Web.UI.WebControls;
9	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	}
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