LINQPad 8 Antivirus Performance Test

README.md

This is adjusted from LINQPad 8's Antivirus Performance Test but converted to run as a standard console app

antivirus-perf-test.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <RootNamespace>antivirus_perf_test</RootNamespace>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.10.0" />
  </ItemGroup>

</Project>

Program.cs

// Antivirus Performance Test
//
// This query generates a tiny (2KB) DLL and times how long it takes to load.
//
// Normal results on a healthy computer:
//  - 1 millisecond or less with antivirus software disabled
//  - 30 milliseconds or less with antivirus software enabled


using System.Diagnostics;
using System.Reflection;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.Emit;

Random random = new();

Console.WriteLine($"ProcessName = {Path.GetFileName(Environment.ProcessPath)}");
Console.WriteLine($"OutputFolder = {Environment.CurrentDirectory}");
	
for (int i = 1; i < 11; i++)
{
    string path = $"test{i}.dll";
    CreateTinyAssembly (path);

    var sw = Stopwatch.StartNew();
    Assembly.LoadFile (Path.GetFullPath (path));    // This should not take long!
    sw.Stop();

    Console.WriteLine($"Test {i} - {Math.Round (sw.Elapsed.TotalMilliseconds, 3)} milliseconds");
}
Environment.Exit (0);   // End the process right away to release locks on the assemblies.


void CreateTinyAssembly (string path)
{
	// Use the Microsoft Roslyn API to compile a DLL from a really simple class.
	// Start with a SyntaxTree containing the source code:
	var tree = CSharpSyntaxTree.ParseText ($"class Test{random.Next()} {{}}");
	
	var compilation = CSharpCompilation    // Create a compilation
		.Create ("test")
		.WithOptions (new CSharpCompilationOptions (OutputKind.DynamicallyLinkedLibrary))
		.AddSyntaxTrees (tree)
		.AddReferences (MetadataReference.CreateFromFile (typeof (int).Assembly.Location));
	
	EmitResult result = compilation.Emit (path);   // Compile to disk
	if (!result.Success)
	{
		throw new Exception ("Could not compile code");
	}
}