我知道在ASP.net中,我们可以通过内容页访问主页面变量,但是否有任何方法可以通过主页面访问内容页变量呢?
是的,您可以。您需要实现一个基类,并从该基类派生内容类。
编辑:发布标记并更改代码以提供更清晰的示例
我创建了一个基本页面,继承了System.Web.UI.Page,然后使内容页面继承它。我的基础页面:
namespace WebApplication2
{
public class BasePage : System.Web.UI.Page
{
public BasePage() { }
public virtual string TextValue()
{
return "";
}
}
}
<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication2._Default" %>
<asp:Content runat="server" ID="BodyContent" ContentPlaceHolderID="MainContent">
<asp:Label ID="lblContentText" Text="Contentpage TextValue:" runat="server"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</asp:Content>
内容页面代码:
namespace WebApplication2
{
public partial class _Default : BasePage
{
protected void Page_Load(object sender, EventArgs e)
{
}
public override string TextValue()
{
return TextBox1.Text;
}
}
}
我的主控页面标记:
<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Site.master.cs" Inherits="WebApplication2.SiteMaster" %>
<!DOCTYPE html>
<html lang="en">
<head runat="server">
<meta charset="utf-8" />
<title><%: Page.Title %> - My ASP.NET Application</title>
<asp:ContentPlaceHolder runat="server" ID="HeadContent" />
</head>
<body>
<form runat="server">
<header> </header>
<div id="body">
<asp:Label ID="lblText" runat ="server" Text="Masterpage Text :" />
<asp:TextBox ID="txtMaster" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Click to read content page TextValue " OnClick="Button1_Click" />
<asp:ContentPlaceHolder runat="server" ID="MainContent" />
</div>
<footer>
</footer>
</form>
</body>
</html>
在主页面代码后端的实现:
namespace WebApplication2
{
public partial class SiteMaster : MasterPage
{
BasePage Currentpage = null;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
Currentpage = this.Page as BasePage;
if (Currentpage != null)
{
txtMaster.Text = Currentpage.TextValue();
}
}
}
}