Chapter 4 Testing _PageStart.cshtml

jpjamie · January 1st, 2012, 06:13 AM

Want to say here I REALLY like this book!!

Getting this error when I run Default.cshtml from the Level 1 folder at #13, page 108 Chapter 4.

NOTE: This error is generated from unaltered downloaded code after my typed in code failed...

Cannot perform runtime binding on a null reference
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: Microsoft.CSharp.RuntimeBinder.RuntimeBinderExcept ion: Cannot perform runtime binding on a null reference

Source Error:

Code:

Line 6:      var i = 0;
Line 7:      foreach(var color in Page.Colors) {
Line 8:          <p style="background-color:@color;font-family:@Page.Fonts[i];">
Line 9:              This paragraph is @color
Line 10:         </p>

Mike Brind · January 1st, 2012, 07:56 AM

Hi Jamie,

Glad you like the book so far.

I have just downloaded the Chapter4.zip file from here: http://www.wrox.com/WileyCDA/WroxTit...-DOWNLOAD.html and without making any changes, launched Level1/Default.cshtml successfully.

You would only get the error you describe if Level1/_PageStart.cshtml is missing, or if the first line of code is commented out or has been removed. It should set the array that contains the colours:

Code:

Page.Fonts = new []{"Verdana", "Arial", "Courier New"};

kamer · January 5th, 2012, 03:32 AM

Hi Mike and Jamie.
First of all, I would like to thank you Mike for creating that wonderful book(Also, to Imar. )
Secondly, Jamie mentioned a missing part in the book. Thanks Jamie. And the fixing code in Jamie's problem, as Mike mentioned, is:

Page.Fonts = new []{"Verdana", "Arial", "Courier New"}

must be inserted in Level1/_PageStart. and must be like this

@{
Layout = "~/Shared/_Layout1.cshtml";
PageData["Colors"] = new []{"LightCyan", "Gainsboro","Chocolate"};
Page.Fonts = new []{"Verdana", "Arial", "Courier New"};}

The other problem I found in Chapter 4 sample is the link code mentioned in Level1/Default.cshtml...

The book says <p><a href="/Level1/Page">Click</a> to visit Level 1</p>

but it results an error page in IE8 . the code must be like this:

<p><a href="Page">Click</a> to visit Level 1</p>

No including Level1 part...

Just wanted to remind to all grateful users