# 03 Read a csv – demo explained

https://github.com/howest-mct/DEVPROG_DEMO_03/tree/main/Demo_03_Readacsv

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# Demo
This is a screencast on how to read from a csv file - no sound.

::: warning
Be careful: in the demo, the static functions to get data are still in the Model class. Your functions should be in a repository class as explained in lab!
:::

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# Python


# C#

## Model


To get the code above to be compiled, we need to add two extra using statements:


* System.IO stands for Input/Output, and is required to use the StreamReader object.
* System.Reflection enables code to be compiled at runtime, and is needed to get the assembly info.


* For now, all you have to understand from these lines of code, is that:
* **typeof(…)** needs the `<classname>`, and
* **GetManifestResourceStream(…)** needs a string of the following format:

`“<project_name>.<foldername>.<filename_with_extension>”`

Eg. in this case:
* <project_name> Demo_03_Readacsv
* <foldername> the csv file is in a folder named Assets
* <filename_with_ext> beerlist.csv

* The ‘using’ block makes sure the file is seized on by the program, and is automatically closed / released at the end of that block.

## Xamarin specific: display using layout

We will display the list of beers by making use of a ListView control. This is a control that’s used to display a list of objects.

### MainPage.xaml

In your xaml file (= visual layout), you can find the ListView control that was added:

The ListView gets a name to make it accessible from code

### MainPage.xaml.cs

The code behind file will now use the name of the list to fill it with data

The ItemsSource property contains the collection of items the ListView should display

## The result
If you start the application, you can see a list of beers. The details of the visualization (such as colors) can vary among the different operation systems and are based on the settings of the device.