为什么在ASP.NET中的包含文件中无法识别asp

Question

I have an about.aspx page which calls an include file (because I want to reuse the file in my other aspx pages as well) like this:

<!-- #include virtual ="includeNav/radHours.inc" -->

Inside the include file, I have a bunch of HTML/ASP.NET controls. Some of them are:

<asp:Label id="lhWP" runat="server" text="White Plains" />
<div id="dvWP" runat="server" style="width: 100%; text-align: center; padding-top: 10px;"></div>

I get the following error:

Namespace prefix 'asp' not defined

Why do I get the error and how do I resolve it?

Answer 1

Create a UserControl, then reference it in the about.aspx page.

In Visual Studio right-click on your project or a subfolder within it, then point to Add and select New Item...

Then in the Add New Item dialog box select Web , then click on Web Forms User Control (It may simply say User Control ). Name it RadHours.ascx

Then paste the code from your SSI (server-side include) in the user control. Please note that the Inherits property uses the namespace WebApplication1 . You will need to change this so it matches your namespace scheme. This is for illustration purposes.

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="RadHours.ascx.cs" Inherits="WebApplication1.RadHours" %>

<asp:Label id="lhWP" runat="server" text="White Plains" />
<div id="dvWP" runat="server" style="width: 100%; text-align: center; padding-top: 10px;"></div>

Then in the about.aspx page, place the following line below the @Page directive:

<%@ Register tagPrefix="uc" tagName="RadHours" src="RadHours.ascx" %>

Finally, replace the #include directive you used with this:

<uc:RadHours ID="radHours" runat="server" />