The Microsoft.VisualStudio.TestTools.UnitTesting package library provides a set of attributes, classes, and interfaces that support unit testing. One of the useful classes in this package is the List class, which allows us to create and manipulate lists of elements of type T.
The Where method is a LINQ extension method that is used to filter elements from a list based on a given condition. It returns a new list with elements that satisfy the condition. Here are some code examples:
// create a list of integers List numbers = new List { 1, 2, 3, 4, 5 };
// use Where to filter even numbers var evenNumbers = numbers.Where(x => x % 2 == 0); // the result will be a new list with values { 2, 4 }
// use Where to filter numbers greater than 3 var greaterThanThree = numbers.Where(x => x > 3); // the result will be a new list with values { 4, 5 }
In these examples, we use lambda expressions to define the conditions for filtering the elements. The Where method takes a Func parameter that specifies the condition for each element.
To use the Microsoft.VisualStudio.TestTools.UnitTesting package library, add a reference to the assembly in your project and include the following namespace at the top of your code file:
using Microsoft.VisualStudio.TestTools.UnitTesting;
This will give you access to all the classes and attributes in the library, including the List class and its methods like Where.
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