Issue 46: Switch netcoreapp2 to netstandard2 for libraries. Removed unused using that required netcoreapp3.1. Fixed string to char. Added .NETStandard2.0 dependency to nuspec.

Author: RyanGrange

.gitignore

@@ -161,6 +161,7 @@ ClientBin/
 *.pfx
 *.publishsettings
 node_modules/
+*.nupkg
 
 # RIA/Silverlight projects
 Generated_Code/

Algorithms/Algorithms.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>    
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFramework>netstandard2.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>

Algorithms/Numeric/SieveOfAtkin.cs

@@ -1,5 +1,4 @@
 using System.Collections.Generic;
-using System.Reflection.Metadata.Ecma335;
 using System.Threading.Tasks;
 
 /***

DataStructures/Common/PrimesList.cs

@@ -225,7 +225,7 @@ private static string[] _readResource(string resourceName)
 	        {
 		        using (var stream = typeof(PrimesList).GetTypeInfo().Assembly.GetManifestResourceStream(resourceName))
 		        using (var reader = new StreamReader(stream ?? throw new InvalidOperationException("Failed to read resource"), Encoding.UTF8))
-			        return reader.ReadToEnd().Split("\n");
+			        return reader.ReadToEnd().Split('\n');
 	        }
 	        catch (Exception ex)
 	        {

DataStructures/DataStructures.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>    
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFramework>netstandard2.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>

Nuget/c-sharp-algorithms.nuspec

@@ -11,6 +11,9 @@
     <projectUrl>https://github.com/aalhour/C-Sharp-Algorithms</projectUrl>
     <icon>images\icon.png</icon>
     <description>Plug-and-play class-library project of standard Data Structures and Algorithms in C#.</description>
+    <dependencies>
+	  <group targetFramework=".NETStandard2.0" />
+    </dependencies>
   </metadata>
   	<files>
 		<file src="..\Algorithms\bin\Release\**\*.*" target="lib" />