From dac1674642d71e9e236fdfa287ba1ca5710c332d Mon Sep 17 00:00:00 2001
From: Vladimir Pecanac <vladimir.pecanac@gmail.com>
Date: Mon, 24 Aug 2026 00:18:27 +0200
Subject: [PATCH] ArrayListVsList: retarget net10.0, add mixed-type ArrayList
 cast demonstration

Retargets both projects from net7.0 to net10.0. Adds a mixed-type
ArrayList to the sample with two read paths - a matching cast that
returns the value and a wrong cast that compiles and throws
InvalidCastException at run time - plus two tests covering them.
Kept out of Program.cs so the sample still runs to completion.
---
 .../ArrayListVsList/ArrayListVsList.csproj       |  2 +-
 .../ArrayListVsList/Collection.cs                |  6 ++++++
 collections-lists/ArrayListVsList/Tests/Test.cs  | 16 ++++++++++++++++
 .../ArrayListVsList/Tests/Tests.csproj           |  2 +-
 4 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/collections-lists/ArrayListVsList/ArrayListVsList/ArrayListVsList.csproj b/collections-lists/ArrayListVsList/ArrayListVsList/ArrayListVsList.csproj
index 6b41fab780..91deb170c0 100644
--- a/collections-lists/ArrayListVsList/ArrayListVsList/ArrayListVsList.csproj
+++ b/collections-lists/ArrayListVsList/ArrayListVsList/ArrayListVsList.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
diff --git a/collections-lists/ArrayListVsList/ArrayListVsList/Collection.cs b/collections-lists/ArrayListVsList/ArrayListVsList/Collection.cs
index b864bea4a5..278a5351e3 100644
--- a/collections-lists/ArrayListVsList/ArrayListVsList/Collection.cs
+++ b/collections-lists/ArrayListVsList/ArrayListVsList/Collection.cs
@@ -33,6 +33,12 @@ public int GetSum(ArrayList arrayList)
             return Sum;
         }
 
+        public ArrayList MixedTypes { get; set; } = new() { 1, "two", DateTime.Now };
+
+        public int ReadFirstAsInt() => (int)MixedTypes[0]!;
+
+        public int ReadSecondAsInt() => (int)MixedTypes[1]!;
+
         public void ListExample()
         {
             Sum = 0;
diff --git a/collections-lists/ArrayListVsList/Tests/Test.cs b/collections-lists/ArrayListVsList/Tests/Test.cs
index 71d4e16838..f6b3757471 100644
--- a/collections-lists/ArrayListVsList/Tests/Test.cs
+++ b/collections-lists/ArrayListVsList/Tests/Test.cs
@@ -29,6 +29,22 @@ public void WhenValidObjectsAddedToList_ThenSumSuccessful()
             Assert.Equal(expectedResult, _collection.Sum);
         }
 
+        [Fact]
+        public void WhenMixedTypeArrayListReadWithMatchingCast_ThenValueReturned()
+        {
+            var expectedResult = 1;
+
+            var actualResult = _collection.ReadFirstAsInt();
+
+            Assert.Equal(expectedResult, actualResult);
+        }
+
+        [Fact]
+        public void WhenMixedTypeArrayListReadWithWrongCast_ThenInvalidCastExceptionThrown()
+        {
+            Assert.Throws<InvalidCastException>(() => _collection.ReadSecondAsInt());
+        }
+
         [Fact]
         public void WhenInvalidObjectsAddedToArrayList_ThenSumFail()
         {
diff --git a/collections-lists/ArrayListVsList/Tests/Tests.csproj b/collections-lists/ArrayListVsList/Tests/Tests.csproj
index 5931c8d235..0c99143a68 100644
--- a/collections-lists/ArrayListVsList/Tests/Tests.csproj
+++ b/collections-lists/ArrayListVsList/Tests/Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>