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Virtual Methods in C#: .NET 10, MSTest 4.5.1, Moq failure test, virtual call benchmarks #2305

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Merged
vladimir-pecanac-main merged 2 commits into from
Oct 24, 2026
Merged

Virtual Methods in C#: .NET 10, MSTest 4.5.1, Moq failure test, virtual call benchmarks #2305

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Virtual Methods in C#: .NET 10, MSTest 4.5.1, Moq failure test, virtu…
vladimir-pecanac-main Oct 17, 2026
89a1a66
Merge branch 'main' into seo/90138-virtual-methods-csharp
vladimir-pecanac-main Oct 24, 2026
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14 changes: 14 additions & 0 deletions csharp-methods/VirtualMethodsInCSharp/Benchmarks/Benchmarks.csproj
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<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net10.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>

<ItemGroup>
<PackageReference Include="BenchmarkDotNet" Version="0.15.8" />
</ItemGroup>

</Project>
4 changes: 4 additions & 0 deletions csharp-methods/VirtualMethodsInCSharp/Benchmarks/Program.cs
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using BenchmarkDotNet.Running;
using Benchmarks;

BenchmarkRunner.Run<VirtualCallBenchmarks>();
36 changes: 36 additions & 0 deletions csharp-methods/VirtualMethodsInCSharp/Benchmarks/Shapes.cs
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namespace Benchmarks;

public interface IShape
{
double CalculateArea();
}

public class Shape : IShape
{
public virtual double CalculateArea() => 0;
}

public class Circle : Shape
{
public double Radius { get; init; }

public override double CalculateArea() => Math.PI * Radius * Radius;

public double CalculateAreaNonVirtual() => Math.PI * Radius * Radius;
}

public sealed class SealedCircle : Shape
{
public double Radius { get; init; }

public override double CalculateArea() => Math.PI * Radius * Radius;
}

public class Rectangle : Shape
{
public double Width { get; init; }

public double Height { get; init; }

public override double CalculateArea() => Width * Height;
}
82 changes: 82 additions & 0 deletions csharp-methods/VirtualMethodsInCSharp/Benchmarks/VirtualCallBenchmarks.cs
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using BenchmarkDotNet.Attributes;

namespace Benchmarks;

public class VirtualCallBenchmarks
{
private const int Count = 1_000;

private Circle[] _circles = [];
private Shape[] _circlesAsShapes = [];
private Shape[] _mixedShapes = [];
private SealedCircle[] _sealedCircles = [];
private IShape[] _circlesAsInterfaces = [];
private Func<double>[] _delegates = [];

[GlobalSetup]
public void Setup()
{
_circles = Enumerable.Range(1, Count).Select(i => new Circle { Radius = i }).ToArray();
_circlesAsShapes = _circles;
_circlesAsInterfaces = _circles;
_sealedCircles = Enumerable.Range(1, Count).Select(i => new SealedCircle { Radius = i }).ToArray();
_mixedShapes = Enumerable.Range(1, Count)
.Select(i => i % 2 == 0 ? (Shape)new Circle { Radius = i } : new Rectangle { Width = i, Height = 2 })
.ToArray();
_delegates = _circles.Select(c => (Func<double>)c.CalculateArea).ToArray();
}

[Benchmark(Baseline = true)]
public double NonVirtual()
{
var total = 0.0;
foreach (var circle in _circles)
total += circle.CalculateAreaNonVirtual();
return total;
}

[Benchmark]
public double VirtualOneType()
{
var total = 0.0;
foreach (var shape in _circlesAsShapes)
total += shape.CalculateArea();
return total;
}

[Benchmark]
public double VirtualTwoTypes()
{
var total = 0.0;
foreach (var shape in _mixedShapes)
total += shape.CalculateArea();
return total;
}

[Benchmark]
public double VirtualOnSealedType()
{
var total = 0.0;
foreach (var circle in _sealedCircles)
total += circle.CalculateArea();
return total;
}

[Benchmark]
public double Interface()
{
var total = 0.0;
foreach (var shape in _circlesAsInterfaces)
total += shape.CalculateArea();
return total;
}

[Benchmark]
public double Delegate()
{
var total = 0.0;
foreach (var calculateArea in _delegates)
total += calculateArea();
return total;
}
}
12 changes: 6 additions & 6 deletions csharp-methods/VirtualMethodsInCSharp/Tests/Tests.csproj
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@@ -1,7 +1,7 @@
<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<TargetFramework>net7.0</TargetFramework>
<TargetFramework>net10.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>

Expand All @@ -10,11 +10,11 @@
</PropertyGroup>

<ItemGroup>
<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
<PackageReference Include="Moq" Version="4.18.4" />
<PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
<PackageReference Include="MSTest.TestFramework" Version="2.2.10" />
<PackageReference Include="coverlet.collector" Version="3.2.0" />
<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.11.0" />
<PackageReference Include="Moq" Version="4.21.0" />
<PackageReference Include="MSTest.TestAdapter" Version="4.5.1" />
<PackageReference Include="MSTest.TestFramework" Version="4.5.1" />
<PackageReference Include="coverlet.collector" Version="10.1.0" />
</ItemGroup>

<ItemGroup>
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13 changes: 13 additions & 0 deletions csharp-methods/VirtualMethodsInCSharp/Tests/VirtualMethodsInCSharpUnitTests.cs
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Expand Up @@ -96,5 +96,18 @@ public void WhenCircleClassGetShapeTypeMock_ThenCircleClassGetShapeTypeResult()

Assert.AreEqual("This is a circle", circleType);
}

[TestMethod]
public void WhenCircleClassDrawMock_ThenNotSupportedException()
{
var circleMock = new Mock<Circle>();

var exception = Assert.ThrowsExactly<NotSupportedException>(
() => circleMock.Setup(p => p.Draw()).Returns("Drawing a circle"));

StringAssert.Contains(exception.Message, "Unsupported expression: p => p.Draw()");
StringAssert.Contains(exception.Message,
"Non-overridable members (here: Circle.Draw) may not be used in setup / verification expressions.");
}
}
}
34 changes: 34 additions & 0 deletions csharp-methods/VirtualMethodsInCSharp/VirtualMethodsInCSharp.sln
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Expand Up @@ -7,20 +7,54 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "VirtualMethodsInCSharp", "V
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Tests", "Tests\Tests.csproj", "{92452288-07FB-4BBD-8D38-12051459DBA3}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Benchmarks", "Benchmarks\Benchmarks.csproj", "{A9E1E7FD-1F81-43D8-83AA-9F9305271A28}"
EndProject
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HideSolutionNode = FALSE
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2 changes: 1 addition & 1 deletion csharp-methods/VirtualMethodsInCSharp/VirtualMethodsInCSharp/Program.cs
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Expand Up @@ -5,7 +5,7 @@
var rectangle = new Rectangle() { Height = 2, Width = 3 };

Console.WriteLine($"Shape area: {shape.CalculateArea()}"); // Shape area: 0
Console.WriteLine($"Circle area: {circle.CalculateArea()}"); // Circle area: 12,566370614359172
Console.WriteLine($"Circle area: {circle.CalculateArea()}"); // Circle area: 12.566370614359172
Console.WriteLine($"Rectangle area: {rectangle.CalculateArea()}"); // Rectangle area: 6

Console.WriteLine($"Shape type: {shape.GetShapeType()}"); // Shape type: This is a generic shape
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2 changes: 1 addition & 1 deletion csharp-methods/VirtualMethodsInCSharp/VirtualMethodsInCSharp/VirtualMethodsInCSharp.csproj
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Expand Up @@ -2,7 +2,7 @@

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net7.0</TargetFramework>
<TargetFramework>net10.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
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