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Expression Trees in C#: update to .NET 10, add Func vs Expression filter and compile benchmarks #2350

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18 changes: 18 additions & 0 deletions csharp-advanced-topics/ExpressionTreesInCSharp/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>

<ItemGroup>
<ProjectReference Include="..\ExpressionTreesInCSharp\ExpressionTreesInCSharp.csproj" />
</ItemGroup>

</Project>
38 changes: 38 additions & 0 deletions csharp-advanced-topics/ExpressionTreesInCSharp/Benchmarks/CompileBenchmarks.cs
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using BenchmarkDotNet.Attributes;
using ExpressionTreesInCSharp;
using System.Linq.Expressions;

namespace Benchmarks;

[MemoryDiagnoser]
public class CompileBenchmarks
{
private readonly Expression<Func<int, int, int>> _sumExpressionTree =
ExpressionTrees.CreateExpressionTreeFromLambdaExpression();

private readonly Func<int, int, int> _lambda = ExpressionTrees.CreateLambdaExpression();
private Func<int, int, int> _compiled = default!;
private Func<int, int, int> _interpreted = default!;

[GlobalSetup]
public void Setup()
{
_compiled = _sumExpressionTree.Compile();
_interpreted = _sumExpressionTree.Compile(preferInterpretation: true);
}

[Benchmark]
public int InvokeLambda() => _lambda(1, 2);

[Benchmark]
public int InvokeCachedCompiledDelegate() => _compiled(1, 2);

[Benchmark]
public int InvokeCachedInterpretedDelegate() => _interpreted(1, 2);

[Benchmark]
public int CompileAndInvoke() => _sumExpressionTree.Compile()(1, 2);

[Benchmark]
public int InterpretAndInvoke() => _sumExpressionTree.Compile(preferInterpretation: true)(1, 2);
}
3 changes: 3 additions & 0 deletions csharp-advanced-topics/ExpressionTreesInCSharp/Benchmarks/Program.cs
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using BenchmarkDotNet.Running;

BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args);
34 changes: 34 additions & 0 deletions csharp-advanced-topics/ExpressionTreesInCSharp/ExpressionTreesInCSharp.sln
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Expand Up @@ -7,20 +7,54 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ExpressionTreesInCSharp", "
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Tests", "Tests\Tests.csproj", "{1421730A-00C5-44F5-98F4-8E6623F7C3C5}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Benchmarks", "Benchmarks\Benchmarks.csproj", "{17A874D8-A920-4912-8E62-1B43E8176375}"
EndProject
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HideSolutionNode = FALSE
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4 changes: 2 additions & 2 deletions .../ExpressionTreesInCSharp/ExpressionTreesInCSharp/DynamicMethods/DynamicMethodGenerator.cs
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Expand Up @@ -13,8 +13,8 @@ public static Func<int, int, int> GenerateExecutableFunctionFromMathStatement(st
var right = Expression.Parameter(typeof(int), variables[1]);

// Create the expression tree
var add = Expression.Multiply(left, right);
var lambda = Expression.Lambda(add, left, right);
var product = Expression.Multiply(left, right);
var lambda = Expression.Lambda(product, left, right);

// Return the compiled method
return (Func<int, int, int>)lambda.Compile();
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13 changes: 12 additions & 1 deletion .../ExpressionTreesInCSharp/ExpressionTreesInCSharp/EntityFramework/EntityFrameworkSqlite.cs
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@@ -1,4 +1,5 @@
using Microsoft.EntityFrameworkCore;
using System.Linq.Expressions;

namespace ExpressionTreesInCSharp.EntityFramework;
public class EntityFrameworkSqlite
Expand Down Expand Up @@ -26,4 +27,14 @@ public string GetWhereQuery()

return whereQuery;
}
}

public IEnumerable<User> FilterWithFunc(Func<User, bool> predicate)
{
return _dbContext.Users.Where(predicate);
}

public IQueryable<User> FilterWithExpression(Expression<Func<User, bool>> predicate)
{
return _dbContext.Users.Where(predicate);
}
}
5 changes: 5 additions & 0 deletions csharp-advanced-topics/ExpressionTreesInCSharp/ExpressionTreesInCSharp/ExpressionTrees.cs
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Expand Up @@ -33,4 +33,9 @@ public static Func<int, int, int> CompileExpressionTreeToLambdaExpression(Expres

return delegateRepresentingLambdaExpression;
}

public static Func<int, int, int> InterpretExpressionTree(Expression<Func<int, int, int>> expressionTree)
{
return expressionTree.Compile(preferInterpretation: true);
}
}
4 changes: 2 additions & 2 deletions ...ced-topics/ExpressionTreesInCSharp/ExpressionTreesInCSharp/ExpressionTreesInCSharp.csproj
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Expand Up @@ -2,13 +2,13 @@

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

<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.4" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.14" />
</ItemGroup>

</Project>
12 changes: 12 additions & 0 deletions csharp-advanced-topics/ExpressionTreesInCSharp/Tests/EntityFrameworkTests.cs
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Expand Up @@ -33,4 +33,16 @@ public void GivenAUserDbContext_WhenListedUsersWithFilters_ThenShouldUseCorrectQ

Assert.Equal(expectedQuery, query);
}

[Fact]
public void GivenAFuncPredicate_WhenFiltering_ThenTheQueryLeavesEntityFramework()
{
var efSqlite = new EntityFrameworkSqlite();

var withFunc = efSqlite.FilterWithFunc(x => x.Age > 20);
var withExpression = efSqlite.FilterWithExpression(x => x.Age > 20);

Assert.False(withFunc is IQueryable<User>);
Assert.True(withExpression is IQueryable<User>);
}
}
12 changes: 11 additions & 1 deletion csharp-advanced-topics/ExpressionTreesInCSharp/Tests/ExpressionTreeTests.cs
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Expand Up @@ -70,4 +70,14 @@ public void GivenAnExpressionTree_WhenCompiled_ThenShouldExecuteAndReturnResult(

Assert.Equal(2, sum);
}
}

[Fact]
public void GivenAnExpressionTree_WhenInterpreted_ThenShouldReturnTheSameResult()
{
var expression = ExpressionTrees.CreateExpressionTreeFromLambdaExpression();

var interpretedSum = ExpressionTrees.InterpretExpressionTree(expression);

Assert.Equal(3, interpretedSum(1, 2));
}
}
12 changes: 6 additions & 6 deletions csharp-advanced-topics/ExpressionTreesInCSharp/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 @@ -10,14 +10,14 @@
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<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
<PrivateAssets>all</PrivateAssets>
</PackageReference>
<PackageReference Include="coverlet.collector" Version="3.2.0">
<PackageReference Include="coverlet.collector" Version="10.1.0">
<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
<PrivateAssets>all</PrivateAssets>
</PackageReference>
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