Using a `foreach` Loop

Instructions

2nd Challenge

1. Add a method named FindItem() to the MediaLibrary class.

   • The method should return a MediaType item and define a parameter of type string named criteria.
   • Use a foreach loop to loop through the items array contained within the MediaLibrary class.
   • Return the item whose Title property contains the provided criteria string parameter value.

2. In the Program.cs file, search the media library for an item by calling the FindItem() method.

   • If an item is found, pass it into a call to the static MediaLibrary DisplayItem() method.
   • If an item isn't found, write the message "Item not found!" to the console.

Finding a String Within Another String

There are many ways in C# to test if a string is contained within another string. Here's one approach that makes use of the String.Contains() method.

var songTitle = "Row Row Row Your Boat";
Console.WriteLine(songTitle.Contains("Your")); // Outputs "true" to the console
Console.WriteLine(songTitle.Contains("your")); // Outputs "false" to the console

This examples demonstrates one potential issue with this approach: the Contains() method is case-sensitive. As a workaround, we can call ToLower() on both the search criteria and item title.

var songTitle = "Row Row Row Your Boat";
Console.WriteLine(songTitle.ToLower().Contains("Your".ToLower())); // Outputs "true" to the console
Console.WriteLine(songTitle.ToLower().Contains("your")); // Outputs "true" to the console

By forcing all of the characters to lowercase, we're eliminating any case-sensitivity issues.

Here's the documentation on both the Contains() and ToLower() methods:

• String.Contains() Method
• String.ToLower() Method

Help

If you get stuck on any of the following topics or simply need a refresher, click on a topic in list below to view the associated video in the C# Objects course.

• Use a foreach loop to iterate through an array's items