Enable implicit usings (#631)

Author: Shane32

Directory.Build.props

@@ -14,6 +14,7 @@
     <Version>1.6.1</Version>
     <LangVersion>12</LangVersion>
     <IsPackable>false</IsPackable>
+    <ImplicitUsings>enable</ImplicitUsings>
 
     <!-- Set common NuGet package properties -->
     <Authors>Raffael Herrmann, Shane Krueger</Authors>
@@ -47,4 +48,12 @@
     <None Include="$(MSBuildThisFileDirectory)nuget-icon.png" Pack="true" PackagePath="\" />
   </ItemGroup>
 
+  <!-- Configure implicit usings -->
+  <ItemGroup>
+    <Using Include="System.Collections.BitArray" Alias="BitArray" />
+    <Using Include="System.Globalization"/>
+    <Using Include="System.Text" />
+    <Using Include="System.Text.RegularExpressions"/>
+  </ItemGroup>
+
 </Project>

Directory.Build.targets

@@ -17,4 +17,9 @@
     <ContinuousIntegrationBuild Condition="'$(Configuration)' == 'Release' AND '$(GITHUB_ACTIONS)' == 'true'">true</ContinuousIntegrationBuild>
   </PropertyGroup>
 
+  <!-- Remove System.Threading.Tasks as implicit using since it does not exist in .NET Framework 3.5 -->
+  <ItemGroup Condition="'$(TargetFramework)' == 'net35'">
+    <Using Remove="System.Threading.Tasks" />
+  </ItemGroup>
+
 </Project>

QRCoder.Xaml/XamlQRCode.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Windows;
 using System.Windows.Media;
 using static QRCoder.QRCodeGenerator;

QRCoder/ASCIIQRCode.cs

@@ -1,6 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
 using static QRCoder.QRCodeGenerator;
 
 namespace QRCoder;

QRCoder/ArtQRCode.cs

@@ -1,6 +1,5 @@
 #if SYSTEM_DRAWING
 
-using System;
 using System.Drawing;
 using System.Drawing.Drawing2D;
 using static QRCoder.ArtQRCode;

QRCoder/Base64QRCode.cs

@@ -1,8 +1,6 @@
 #if !NETSTANDARD1_3
-using System;
 using System.Drawing;
 using System.Drawing.Imaging;
-using System.IO;
 using System.Runtime.InteropServices;
 using static QRCoder.Base64QRCode;
 using static QRCoder.QRCodeGenerator;

QRCoder/BitmapByteQRCode.cs

@@ -1,4 +1,3 @@
-using System;
 using static QRCoder.QRCodeGenerator;
 
 namespace QRCoder;

QRCoder/Exceptions/DataTooLongException.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace QRCoder.Exceptions;
 
 /// <summary>

QRCoder/Extensions/BitArrayExtensions.cs

@@ -1,5 +1,3 @@
-using System.Collections;
-
 namespace QRCoder;
 
 /// <summary>

QRCoder/Extensions/StringValueAttribute.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Reflection;