Add Count property to MemoizingEnumerable (#9468)

jhonabreul · web-flow · commit 3806e8138874 · 2026-05-08T16:10:58.000-04:00
* Add Count property to MemoizingEnumerable

* Update Pythonnet version to 2.0.54
diff --git a/Algorithm.CSharp/QuantConnect.Algorithm.CSharp.csproj b/Algorithm.CSharp/QuantConnect.Algorithm.CSharp.csproj
@@ -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" />
diff --git a/Algorithm.Framework/QuantConnect.Algorithm.Framework.csproj b/Algorithm.Framework/QuantConnect.Algorithm.Framework.csproj
@@ -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" />
diff --git a/Algorithm/QuantConnect.Algorithm.csproj b/Algorithm/QuantConnect.Algorithm.csproj
@@ -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" />
diff --git a/AlgorithmFactory/QuantConnect.AlgorithmFactory.csproj b/AlgorithmFactory/QuantConnect.AlgorithmFactory.csproj
@@ -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>
diff --git a/Common/QuantConnect.csproj b/Common/QuantConnect.csproj
@@ -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" />
diff --git a/Common/Util/MemoizingEnumerable.cs b/Common/Util/MemoizingEnumerable.cs
@@ -14,6 +14,7 @@
  *
 */
 
+using System;
 using System.Collections;
 using System.Collections.Generic;
 
@@ -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>
diff --git a/Engine/QuantConnect.Lean.Engine.csproj b/Engine/QuantConnect.Lean.Engine.csproj
@@ -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" />
diff --git a/Indicators/QuantConnect.Indicators.csproj b/Indicators/QuantConnect.Indicators.csproj
@@ -31,7 +31,7 @@
     <Message Text="SelectedOptimization $(SelectedOptimization)" Importance="high" />
   </Target>
   <ItemGroup>
-    <PackageReference Include="QuantConnect.pythonnet" Version="2.0.53" />
+    <PackageReference Include="QuantConnect.pythonnet" Version="2.0.54" />
     <PackageReference Include="MathNet.Numerics" Version="5.0.0" />
   </ItemGroup>
   <ItemGroup>
diff --git a/Report/QuantConnect.Report.csproj b/Report/QuantConnect.Report.csproj
@@ -39,7 +39,7 @@
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="QuantConnect.pythonnet" Version="2.0.53" />
+    <PackageReference Include="QuantConnect.pythonnet" Version="2.0.54" />
     <PackageReference Include="Deedle" Version="2.1.0" />
     <PackageReference Include="MathNet.Numerics" Version="5.0.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
diff --git a/Research/QuantConnect.Research.csproj b/Research/QuantConnect.Research.csproj
@@ -1,4 +1,4 @@
-﻿<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
@@ -34,7 +34,7 @@
     <PackageReference Include="Plotly.NET" Version="5.1.0" />
     <PackageReference Include="Plotly.NET.CSharp" Version="0.13.0" />
     <PackageReference Include="Plotly.NET.Interactive" Version="5.0.0" />
-    <PackageReference Include="QuantConnect.pythonnet" Version="2.0.53" />
+    <PackageReference Include="QuantConnect.pythonnet" Version="2.0.54" />
     <PackageReference Include="NodaTime" Version="3.0.5" />
   </ItemGroup>
   <ItemGroup>
diff --git a/Tests/Common/Util/MemoizingEnumerableTests.cs b/Tests/Common/Util/MemoizingEnumerableTests.cs
@@ -1,4 +1,4 @@
-﻿/*
+/*
  * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
  * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
  * 
@@ -50,5 +50,14 @@ public void EnumeratesOnce()
             // enumerating memoized twice shouldn't matter
             CollectionAssert.AreEqual(memoized.ToList(), memoized.ToList());
         }
+
+        [Test]
+        public void GetsCount()
+        {
+            var list = new List<int> {1, 2, 3, 4, 5};
+            var memoized = new MemoizingEnumerable<int>(list);
+            Assert.AreEqual(5, memoized.Count);
+            Assert.AreEqual(memoized.Count, memoized.ToList().Count);
+        }
     }
 }
diff --git a/Tests/QuantConnect.Tests.csproj b/Tests/QuantConnect.Tests.csproj
@@ -31,7 +31,7 @@
   </PropertyGroup>
   <Import Project="$(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" />
