Skip to content

Add Count property to MemoizingEnumerable #9468

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
jhonabreul merged 2 commits into from
May 8, 2026
Merged

Add Count property to MemoizingEnumerable #9468

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
13600c4
Add Count property to MemoizingEnumerable
jhonabreul May 7, 2026
3225066
Update Pythonnet version to 2.0.54
jhonabreul May 7, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion Algorithm.CSharp/QuantConnect.Algorithm.CSharp.csproj
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,7 @@
<DebugType>portable</DebugType>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.53" />
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.54" />
<PackageReference Include="Accord" Version="3.6.0" />
<PackageReference Include="Accord.Fuzzy" Version="3.6.0" />
<PackageReference Include="Accord.MachineLearning" Version="3.6.0" />
Expand Down
2 changes: 1 addition & 1 deletion Algorithm.Framework/QuantConnect.Algorithm.Framework.csproj
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@
<PackageLicenseFile>LICENSE</PackageLicenseFile>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.53" />
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.54" />
<PackageReference Include="Accord" Version="3.6.0" />
<PackageReference Include="Accord.Math" Version="3.6.0" />
<PackageReference Include="Accord.Statistics" Version="3.6.0" />
Expand Down
2 changes: 1 addition & 1 deletion Algorithm/QuantConnect.Algorithm.csproj
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@
<PackageLicenseFile>LICENSE</PackageLicenseFile>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.53" />
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.54" />
<PackageReference Include="MathNet.Numerics" Version="5.0.0" />
<PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
<PackageReference Include="NodaTime" Version="3.0.5" />
Expand Down
2 changes: 1 addition & 1 deletion AlgorithmFactory/QuantConnect.AlgorithmFactory.csproj
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,7 @@
<PackageLicenseFile>LICENSE</PackageLicenseFile>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.53" />
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.54" />
<PackageReference Include="NodaTime" Version="3.0.5" />
</ItemGroup>
<ItemGroup>
Expand Down
2 changes: 1 addition & 1 deletion Common/QuantConnect.csproj
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,7 @@
<Message Text="SelectedOptimization $(SelectedOptimization)" Importance="high" />
</Target>
<ItemGroup>
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.53" />
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.54" />
<PackageReference Include="CloneExtensions" Version="1.3.0" />
<PackageReference Include="fasterflect" Version="3.0.0" />
<PackageReference Include="MathNet.Numerics" Version="5.0.0" />
Expand Down
20 changes: 20 additions & 0 deletions Common/Util/MemoizingEnumerable.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@
*
*/

using System;
using System.Collections;
using System.Collections.Generic;

Expand All @@ -35,6 +36,25 @@ public class MemoizingEnumerable<T> : IEnumerable<T>
/// <remarks>Should be called before the enumeration starts</remarks>
public bool Enabled { get; set; }

/// <summary>
/// Gets the count of items in the enumerable. This will force enumeration of the entire collection if it has not already been enumerated.
/// </summary>
public int Count
{
get
{
if (!Enabled)
{
throw new InvalidOperationException("Count is not supported when memoization is disabled");
}
if (_buffer == null)
{
foreach (var item in this) {}
}
return _buffer.Count;
}
}

/// <summary>
/// Initializes a new instance of the <see cref="MemoizingEnumerable{T}"/> class
/// </summary>
Expand Down
2 changes: 1 addition & 1 deletion Engine/QuantConnect.Lean.Engine.csproj
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,7 @@
<Message Text="SelectedOptimization $(SelectedOptimization)" Importance="high" />
</Target>
<ItemGroup>
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.53" />
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.54" />
<PackageReference Include="fasterflect" Version="3.0.0" />
<PackageReference Include="MathNet.Numerics" Version="5.0.0" />
<PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
Expand Down
2 changes: 1 addition & 1 deletion Indicators/QuantConnect.Indicators.csproj
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@
<Message Text="SelectedOptimization $(SelectedOptimization)" Importance="high" />
</Target>
<ItemGroup>
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.53" />
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.54" />
<PackageReference Include="MathNet.Numerics" Version="5.0.0" />
</ItemGroup>
<ItemGroup>
Expand Down
2 changes: 1 addition & 1 deletion Report/QuantConnect.Report.csproj
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,7 @@
<PackageLicenseFile>LICENSE</PackageLicenseFile>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.53" />
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.54" />
<PackageReference Include="Deedle" Version="2.1.0" />
<PackageReference Include="MathNet.Numerics" Version="5.0.0" />
<PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
Expand Down
4 changes: 2 additions & 2 deletions Research/QuantConnect.Research.csproj
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
<Project Sdk="Microsoft.NET.Sdk">
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
Expand Down Expand Up @@ -34,7 +34,7 @@
<PackageReference Include="Plotly.NET" Version="5.1.0" />
<PackageReference Include="Plotly.NET.CSharp" Version="0.13.0" />
<PackageReference Include="Plotly.NET.Interactive" Version="5.0.0" />
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.53" />
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.54" />
<PackageReference Include="NodaTime" Version="3.0.5" />
</ItemGroup>
<ItemGroup>
Expand Down
11 changes: 10 additions & 1 deletion Tests/Common/Util/MemoizingEnumerableTests.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
/*
/*
* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
*
Expand Down Expand Up @@ -50,5 +50,14 @@ public void EnumeratesOnce()
// enumerating memoized twice shouldn't matter
CollectionAssert.AreEqual(memoized.ToList(), memoized.ToList());
}

[Test]
public void GetsCount()
{
var list = new List<int> {1, 2, 3, 4, 5};
var memoized = new MemoizingEnumerable<int>(list);
Assert.AreEqual(5, memoized.Count);
Assert.AreEqual(memoized.Count, memoized.ToList().Count);
}
}
}
2 changes: 1 addition & 1 deletion Tests/QuantConnect.Tests.csproj
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@
</PropertyGroup>
<Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
<ItemGroup>
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.53" />
<PackageReference Include="QuantConnect.pythonnet" Version="2.0.54" />
<PackageReference Include="Accord" Version="3.6.0" />
<PackageReference Include="Accord.Math" Version="3.6.0" />
<PackageReference Include="Common.Logging" Version="3.4.1" />
Expand Down
Loading