Use Utf8 not just for witing to standard output, but also for reading from standard input (#1735)

Author: adamsitnik

src/BenchmarkDotNet/Engines/ConsoleHost.cs

@@ -8,9 +8,9 @@ namespace BenchmarkDotNet.Engines
     public sealed class ConsoleHost : IHost
     {
         private readonly TextWriter outWriter;
-        private readonly TextReader inReader;
+        private readonly StreamReader inReader;
 
-        public ConsoleHost([NotNull]TextWriter outWriter, [NotNull]TextReader inReader)
+        public ConsoleHost([NotNull]TextWriter outWriter, [NotNull]StreamReader inReader)
         {
             this.outWriter = outWriter ?? throw new ArgumentNullException(nameof(outWriter));
             this.inReader = inReader ?? throw new ArgumentNullException(nameof(inReader));

src/BenchmarkDotNet/Templates/BenchmarkProgram.txt

@@ -27,7 +27,7 @@ namespace BenchmarkDotNet.Autogenerated
 #if WASM
             BenchmarkDotNet.Engines.NoAcknowledgementConsoleHost host = new BenchmarkDotNet.Engines.NoAcknowledgementConsoleHost(System.Console.Out); // this variable name is used by CodeGenerator.GetCoreRtSwitch, do NOT change it
 #else
-            BenchmarkDotNet.Engines.ConsoleHost host = new BenchmarkDotNet.Engines.ConsoleHost(System.Console.Out, System.Console.In); // this variable name is used by CodeGenerator.GetCoreRtSwitch, do NOT change it
+            BenchmarkDotNet.Engines.ConsoleHost host = new BenchmarkDotNet.Engines.ConsoleHost(System.Console.Out, new System.IO.StreamReader(System.Console.OpenStandardInput(), System.Text.Encoding.UTF8)); // this variable name is used by CodeGenerator.GetCoreRtSwitch, do NOT change it
 #endif
 
             // the first thing to do is to let diagnosers hook in before anything happens

src/BenchmarkDotNet/Toolchains/Executor.cs

@@ -91,6 +91,7 @@ private ProcessStartInfo CreateStartInfo(BenchmarkCase benchmarkCase, ArtifactsP
                 RedirectStandardInput = true,
                 RedirectStandardError = false, // #1629
                 CreateNoWindow = true,
+                StandardOutputEncoding = Encoding.UTF8, // #1713
                 WorkingDirectory = null // by default it's null
             };
 

tests/BenchmarkDotNet.Tests/Engine/EngineFactoryTests.cs

@@ -247,7 +247,7 @@ private EngineParameters CreateEngineParameters(Action<long> mainNoUnroll, Actio
                 Dummy3Action = () => { },
                 GlobalSetupAction = GlobalSetup,
                 GlobalCleanupAction = GlobalCleanup,
-                Host = new ConsoleHost(TextWriter.Null, TextReader.Null),
+                Host = new ConsoleHost(TextWriter.Null, StreamReader.Null),
                 OverheadActionUnroll = OverheadUnroll,
                 OverheadActionNoUnroll = OverheadNoUnroll,
                 IterationCleanupAction = IterationCleanup,