Revert "Remove unused usings from example and exemplar (#2387)" (#2393)

This reverts commit 1a54dba.

[no important files changed]

Author: ErikSchierboom

bin/add-practice-exercise.ps1

@@ -35,6 +35,12 @@ $project = "${exerciseDir}/${ExerciseName}.csproj"
 & dotnet new xunit --force -lang "C#" --target-framework-override net9.0 -o $exerciseDir -n $ExerciseName
 & dotnet sln exercises/Exercises.sln add $project
 
+# Cleanup project file
+[xml]$projectXml = Get-Content "${project}"
+$projectXml.Project.RemoveChild($projectXml.Project.ItemGroup[1])
+$projectXml.Project.PropertyGroup.RemoveChild($projectXml.Project.PropertyGroup.SelectSingleNode("ImplicitUsings"))
+$projectXml.Save("${project}")
+
 # Update project packages
 & dotnet remove $project package coverlet.collector
 & dotnet add $project package Exercism.Tests --version 0.1.0-beta1

exercises/concept/annalyns-infiltration/AnnalynsInfiltration.cs

@@ -1,3 +1,5 @@
+using System;
+
 static class QuestLogic
 {
     public static bool CanFastAttack(bool knightIsAwake)

exercises/concept/annalyns-infiltration/AnnalynsInfiltration.csproj

@@ -3,14 +3,9 @@
   <PropertyGroup>
     <TargetFramework>net9.0</TargetFramework>
     <Nullable>enable</Nullable>
-    <ImplicitUsings>enable</ImplicitUsings>
     <RestorePackagesWithLockFile>true</RestorePackagesWithLockFile>
   </PropertyGroup>
 
-  <ItemGroup>
-    <Using Include="Xunit" />
-  </ItemGroup>
-
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="xunit" Version="2.8.1" />

exercises/concept/annalyns-infiltration/AnnalynsInfiltrationTests.cs

@@ -1,3 +1,4 @@
+using Xunit;
 using Exercism.Tests;
 
 public class AnnalynsInfiltrationTests

exercises/concept/attack-of-the-trolls/.meta/Exemplar.cs

@@ -1,3 +1,5 @@
+using System;
+
 enum AccountType
 {
     Guest,

exercises/concept/attack-of-the-trolls/AttackOfTheTrolls.cs

@@ -1,3 +1,5 @@
+using System;
+
 // TODO: define the 'AccountType' enum
 
 // TODO: define the 'Permission' enum

exercises/concept/attack-of-the-trolls/AttackOfTheTrolls.csproj

@@ -3,14 +3,9 @@
   <PropertyGroup>
     <TargetFramework>net9.0</TargetFramework>
     <Nullable>enable</Nullable>
-    <ImplicitUsings>enable</ImplicitUsings>
     <RestorePackagesWithLockFile>true</RestorePackagesWithLockFile>
   </PropertyGroup>
 
-  <ItemGroup>
-    <Using Include="Xunit" />
-  </ItemGroup>
-
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="xunit" Version="2.8.1" />

exercises/concept/attack-of-the-trolls/AttackOfTheTrollsTests.cs

@@ -1,3 +1,4 @@
+using Xunit;
 using Exercism.Tests;
 
 public class AttackOfTheTrollsTests

exercises/concept/authentication-system/.meta/Exemplar.cs

@@ -1,3 +1,4 @@
+using System.Collections.Generic;
 using System.Collections.ObjectModel;
 
 public class Authenticator

exercises/concept/authentication-system/AuthenticationSystem.cs

@@ -1,3 +1,5 @@
+using System.Collections.Generic;
+
 public class Authenticator
 {
     private class EyeColor