0.3 First Day Assignment

Overview

The purpose of this assignment is to familiarize you with errors in Visual Studio, correcting
StyleCop warning, and the Feedback System.

Download the starting code.
Resource
- First Day 0.3 LastName.zip
A. Copy the folder inside the zip to your OneDrive and rename the folder replacing LastName
with your last name and rename the .sln replacing LastName with your last name. B. Open the sln file and go to the MainWindow.xaml.cs C. Right-click the Solution and click 'Restore NuGet Packages'.

Snip - Restore NuGet Packages
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Fix a build error.
A. Build your application.
Resource
- 0.3.1 How to Build/Rebuild Your Application
Build Application

Your Output window should look like the image below.

Build Output
B. Go to View and select Error List.
Resource
- 0.3.2 How to Debug Using the Error List
Snip - Show Error List

This will bring up a window that shows you issues with the code. These issues are
known as compiler errors. Visual Studio has a built in compiler that checks for
errors as you write code.
C. Double click the error shown. It will bring you to the line that the error is on.

Snip - Error Line

There are several other 'Warnings' listed. These are StyleCop issues that we will
handle in the next step. For now, don't worry about them.
D. On the main menu, click Build and then Build Solution.

Snip - Build

Because we have an error in our code the application will not build properly,
meaning that Visual Studio recognizes that something isn't right and the
application is not usable. It will show that the build has failed in the status bar on
the bottom.

Build Failed
E. Start the application.
Every time we start the application, the application saves and then builds first.
1. Because there are build errors, Visual Studio will stop the application from running.
If you get a prompt instead, select 'No' and make sure your Build Settings are
correct. If you don't get a prompt but the application still runs it means your
settings are incorrect and you will need to fix them.

Build Settings
F. Fix the error that is occurring by removing the K between Energy and Level.

Snip - Fix Error
G. Click Build and then Build Solution. The application will build correctly and the Output
window should show that the Build was successful.

Snip - Build Succeeded
H. Start the application. The application should start normally.

Snip - Start Application
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Fix StyleCop Warnings.

StyleCop Warnings are generated when code does not meet proper documentation
standards. These warnings appear in the Error List window and are also shown with
green lines by the issue.
A. Ensure that Build + Intellisense is selected from the Error List dropdown.

Select Build + IntelliSense

If your Error Window includes warning(s) CS8034 "Unable to load Analyzer
Assembly..." Please see the instructions in the "Fix Style Cop Guide" link below.
Resource
- Fix Style Cop Guide
B. Double-click the first warning on the list. It should bring you to line 23. C. Remove the blank line on line 24.

Snip - Fix Line
D. Your warnings should go down to 6.

Snip - StyleCop Warnings
E. Bring back the blank line on 24.

Snip - Blank Line
F. Copy the code comment below and paste it on line 24.
```
/// <summary>
/// A healthy way to start your day.
/// </summary>
```
Snip - Breakfast Comment
G. Your warnings should now go down to 5.

Snip - Five Errors
H. On line 29, type three forward slashes ///. This will create an empty comment skeleton.

Snip - Comment Skeleton
I. In the middle of the summary tags, write a comment about the Student.

Snip - Fill in Comment Skeleton
J. Run StyleCop. There should be only 3 warnings now.

Snip - Three Warnings
K. Double click the first remaining error to bring you to line 49. Visual Studio sometimes has
a hard time knowing what thing you're referring to. It would be like someone pointed at a
desk full of snowglobes and said "Snowglobe". It would be difficult to figure out which one
they meant. Instead, it would be much easier if the person were to touch a particular
snowglobe and say "this Snowglobe". L. Add this. to the beginning of lines 49, 50 and 51.

Snip - Add this.
M. All warnings should be fixed.

Snip - No Warnings
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Upload the First Day Assignment to the Feedback System

Currently when we build the application everything seems fine. This is all well and good, but when
we upload to the Feedback System we get errors.
Resource
- 0.3.4 How to Submit C# Code to the Feedback System
A. Zip up the folder that contains your .sln file and project files.
0.3 First Day 4 Snip ZipFolder.png
B. Double click the zip file. Double click the folder inside the zip file. Ensure that your folder
ONLY contains the .vs folder (you can delete this if you like), the Scenario folder and the
.sln file.
0.3 First Day 4 Snip InsideZipFolder.png
C. Go to the Feedback System website
Resource
- Feedback System
D. Select the First Day 0.3 Assignment

Feedback Assignment
E. Click the Upload Assignment button

Upload Button
F. Select your zip file and click Open
0.3 First Day 4 UploadToFBS.png
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Observe Feedback System Errors
Resource
- 0.3.5 How to Resolve Feedback System C# Code Errors
A. The Feedback System will show you the particular step in the instructions where the error is
occurring. We don't have steps in these assignments so just be aware that with future
assignments the step number and letter show up to the left of the Description.

Step Number
B. Your Feedback System errors should look like the errors below. If they do not please reach out
to your instructor.

Feedback Errors
C. Sometimes the error will be a CRITICAL ERROR. If that is that case, always solve that error
before moving on to anything else. Errors shown AFTER a CRITICAL ERROR are not relevant. D. There will be many times when several error messages are related to one another. This means
that multiple error messages could be resolved by fixing just one thing in code. It will help you
to read all the errors at once to determine if any of the errors are related. Go to top
Fix your first error.
A. Our first error says "The value of Id should be 300145999 (int), but is 300145990." B. Open your First Day 0.3 project. C. Navigate to the MainWindow. D. Here we can see that the Student's Id was assigned incorrectly.

Id Error
E. Change the last number in the Id from a 0 to a 9. F. Build your application. G. Close VIsual Studio. H. Delete the zip file you created previously. This is an old version of the application we don't
want anymore. I. Zip the parent folder as you did previously. J. Click the Resubmit button.

Resubmit
K. Select your new zip file and upload. The error about the Id should now be gone.

Error Fixed
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Fix the next error
A. The next error we need to fix is related to all of the remaining errors. The first error says that
when the event handler was called there was an exception. We can test that locally. B. Open your First Day 0.3 project. C. Start the application. Click the 'New Student' button and the 'Have Breakfast' button. You
will get a NullReferenceException because we are trying to use a field of an object that
doesn't even exist yet. Stop the application.

NullReferenceException
D. Because of this exception, the rest of the application doesn't run. Look at the rest of our
errors: Breakfast is null, the Name field can't be read, the EnergyLevel field can't be read, the
IsHungry field is wrong, the EnergyLevel field is wrong. These are all things happen AFTER the
error we got when we ran the application. E. Before the line of that assigns the Name field of the Breakfast object, instantiate (create)
the Breakfast object by copying and pasting the code below.
```
this.Breakfast = new Breakfast();
```
New Breakfast Object
F. Start the application again and click the 'New Student' and 'Have Breakfast' buttons. We
no longer get the exception that breaks our application! G. Stop the application and close Visual Studio. H. Delete the stale zip file and zip the new application like we did previously. I. Resubmit the new zip file to the Feedback System. J. Ensure that you now get a Success message. If you do not please reach out to your
instructor.

Success Message
K. Copy the URL and submit it to Canvas Go to top