Chapter 6 - Named Skins

mctimoth · November 24th, 2015, 11:16 AM

Hey Imar,

Great book! It should be used in the university course I took on Web Database Development. It looks like it involves all the topics that were taught though I haven't gone all the way through the book yet. Your book is certainly more in-depth and brings in many more ancillary VS topics that make a complete web UI implementation.

In working through chapter 6 Named Skins section, now upon adding the button again in SkinsDemo.aspx, VS adds a third button as shown below and shows the warning: "Unrecognized tag prefix or device filter 'asp'."

<%@ Page Title="Skins Demo" Language="C#" MasterPageFile="~/MasterPages/Frontend.master" AutoEventWireup="true" CodeFile="SkinsDemo.aspx.cs" Inherits="Demos_SkinsDemo" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="cpMainContent" Runat="Server">
<asp:Button ID="Button1" runat="server" Text="Button" /> //first button from the TRY IT OUT
<asp:Button ID="Button2" runat="server" text="Button" SkinID="RedButton"/> //second button from the TRY IT OUT
<asp:button runat="server" text="Button" /> //third button as another attempt
</asp:Content>

When I added the second button as directed in the book it was added just like the third button with the same warning so I corrected the attributes. The button still shows as expected in the browser. Somewhere I mis-typed something or am overriding a setting.

At this point I have three warnings that are exactly the same in the IDE for lines 6, 7, and 8 column 6.

Googling did provide many hits but not my exact issue and I am unable to relate any of the hits to my example.

I also note that MyBasePage is no longer in the Add list after right-clicking an appropriate folder. It was there once when I created the SkinsDemo.aspx listed above but is no longer there. MyBasePage is still listed in the Add | Add New Item... list. Does this have something to do with why I am getting the warnings above?

Regards,
Tim

mctimoth · November 24th, 2015, 08:50 PM

I ran through all of the TRY IT OUT examples again starting from my Chapter 5 backup. If I add a button to my default.aspx it gets added thusly:

<asp:button runat="server" text="Button" />

With a small "b" in button and without and ID attribute.

The warnings in the Output window do not appear but if I hover over asp: I get the message: "Unrecognized tag prefix or device filter 'asp'."

Also, I can now right-click on site and go to Add | MyBasePage. That is not there in my incomplete version of the Chapter 6 TRY IT OUT examples.

One more thing, I have two MyBasePage items listed in the Add New Item list.

Why do I always get these esoteric problems?

Imar · November 27th, 2015, 03:46 PM

Hi there,

Can you post the code for your web.config, your master page and the page you add this button to (markup and code behind)? There might be an error somewhere.

Cheers,

Imar

mctimoth · November 29th, 2015, 09:08 PM

Hey Imar,

Here are the files:

<web.config>
<?xml version="1.0"?>



<configuration>

<system.web>
<pages theme="Monochrome" />
<compilation debug="true" targetFramework="4.5.1" />
<httpRuntime targetFramework="4.5.1" />
</system.web>

</configuration>
</web.config>
<Frontend.master>
<%@ Master Language="C#" AutoEventWireup="true" CodeFile="Frontend.master.cs" Inherits="MasterPages_Frontend" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<asp:ContentPlaceHolder id="head" runat="server">
</asp:ContentPlaceHolder>
<script src="/Scripts/modernizr-2.8.3.js"></script>
</head>
<body>
<form id="form1" runat="server">
<div id ="PageWrapper">
<header><a href = "/"><%--Header Goes Here--%></a></header>
<nav>Menu Goes Here</nav>
<section id="MainContent">
<asp:ContentPlaceHolder ID="cpMainContent" runat="server">
</asp:ContentPlaceHolder>
</section>
<aside id="Sidebar">
Select a Theme
<br />
<asp:DropDownList ID="ThemeList" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ThemeList_SelectedIndexCha nged">
<asp:ListItem>Monochrome</asp:ListItem>
<asp:ListItem>DarkGrey</asp:ListItem>
</asp:DropDownList>
</aside>
<footer>Footer Goes Here</footer>
</div>
</form>
</body>
</html>
</Frontend.master>
<Frontend.master.cs>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class MasterPages_Frontend : System.Web.UI.MasterPage
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
string selectedTheme = Page.Theme;
HttpCookie preferredTheme = Request.Cookies.Get("preferredTheme");
if (preferredTheme != null)
{
selectedTheme = preferredTheme.Value;
}
if (!string.IsNullOrEmpty(selectedTheme))
{
ListItem item = ThemeList.Items.FindByValue(selectedTheme);
if (item != null)
{
item.Selected = true;
}
}
}
}
protected void ThemeList_SelectedIndexChanged(object sender, EventArgs e)
{
HttpCookie preferredTheme = new HttpCookie("PreferredTheme");
preferredTheme.Expires = DateTime.Now.AddMonths(3);
preferredTheme.Value = ThemeList.SelectedValue;
Response.Cookies.Add(preferredTheme);
Response.Redirect(Request.Url.ToString());
}
}

</Frontend.master.cs>
<Default.aspx>
<%@ Page Title="Default" Language="C#" MasterPageFile="~/MasterPages/Frontend.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="cpMainContent" Runat="Server">
<h1>Hi there visitor and welcome.</h1>
<p class="Introduction">
We're glad you're paying a visit to <a href="http://www.PlanetWrox.com">www.PlanetWrox.com</a>, the coolest music community site on the Internet.</p>
<p class="Introduction">
Feel free to have a <a href="Default.aspx">look around</a>; there are lots of interesting <strong>reviews and concert pictures</strong> to be found here.</p>
<asp:button runat="server" text="Button" />
<p>
You can <a href="Login.aspx">log in</a> here</p>
</section>
</asp:Content>
</Default.aspx>
<Default.aspx.cs>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : BasePage
{
protected void Page_Load(object sender, EventArgs e)
{

}
}
</Default.aspx.cs>

Thanks,
Tim

Imar · December 4th, 2015, 11:36 AM

I ran your code in a new web site and it all runs fine.

If you still have issues can you zip your site and make it available for download somewhere?

Thanks,

Imar