From 6974e37f613b8184d4d9002ca8830049a4a88188 Mon Sep 17 00:00:00 2001
From: Vladimir Pecanac <vladimir.pecanac@gmail.com>
Date: Sun, 18 Oct 2026 14:19:32 +0200
Subject: [PATCH] DeprecationInCsharp: move to .NET 10, add DiagnosticId and
 UrlFormat, obsolete class example

---
 .../DeprecationInCsharp/DateUtils.cs                   |  4 +++-
 .../DeprecationInCsharp/DeprecationInCsharp.csproj     |  2 +-
 .../DeprecationInCsharp/LegacyDateUtils.cs             |  7 +++++++
 .../DeprecationInCsharp/DeprecationInCsharp/Program.cs |  3 +++
 .../DeprecationInCsharp/Tests/DateUtilsTests.cs        |  2 ++
 .../DeprecationInCsharp/Tests/Tests.csproj             | 10 +++++-----
 6 files changed, 21 insertions(+), 7 deletions(-)
 create mode 100644 csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/LegacyDateUtils.cs

diff --git a/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/DateUtils.cs b/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/DateUtils.cs
index b0adcdcfdd..d1a11e935b 100644
--- a/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/DateUtils.cs
+++ b/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/DateUtils.cs
@@ -2,7 +2,9 @@
 
 public static class DateUtils
 {
-    [Obsolete("Please use GetCurrentYearV2() instead.", false)]
+    [Obsolete($"Please use {nameof(GetCurrentYearV2)}() instead.",
+        DiagnosticId = "DATEUTILS001",
+        UrlFormat = "https://example.com/obsoletions/{0}")]
     public static int GetCurrentYearV1()
     {
         return 2022;
diff --git a/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/DeprecationInCsharp.csproj b/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/DeprecationInCsharp.csproj
index 2b14c8172d..cd19a35631 100644
--- a/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/DeprecationInCsharp.csproj
+++ b/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/DeprecationInCsharp.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/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/LegacyDateUtils.cs b/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/LegacyDateUtils.cs
new file mode 100644
index 0000000000..a3b302bfca
--- /dev/null
+++ b/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/LegacyDateUtils.cs
@@ -0,0 +1,7 @@
+namespace DeprecationInCsharp;
+
+[Obsolete("Please use DateUtils instead.")]
+public static class LegacyDateUtils
+{
+    public static int GetYear() => 2022;
+}
diff --git a/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/Program.cs b/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/Program.cs
index 6c5c9387ef..ab93eff6cf 100644
--- a/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/Program.cs
+++ b/csharp-basic-topics/DeprecationInCsharp/DeprecationInCsharp/Program.cs
@@ -5,3 +5,6 @@
 
 var newMethodResult = DateUtils.GetCurrentYearV2();
 Console.WriteLine($"Current year from new method: {newMethodResult}");
+
+var legacyYear = LegacyDateUtils.GetYear();
+Console.WriteLine($"Year from legacy class: {legacyYear}");
diff --git a/csharp-basic-topics/DeprecationInCsharp/Tests/DateUtilsTests.cs b/csharp-basic-topics/DeprecationInCsharp/Tests/DateUtilsTests.cs
index 9f04301c9d..5832b8e8c8 100644
--- a/csharp-basic-topics/DeprecationInCsharp/Tests/DateUtilsTests.cs
+++ b/csharp-basic-topics/DeprecationInCsharp/Tests/DateUtilsTests.cs
@@ -7,7 +7,9 @@ public class DateUtilsTests
     [Fact]
     public void WhenUsingV1Method_ThenReturns2022()
     {
+#pragma warning disable DATEUTILS001
         var result = DateUtils.GetCurrentYearV1();
+#pragma warning restore DATEUTILS001
         
         Assert.Equal(2022, result);
     }
diff --git a/csharp-basic-topics/DeprecationInCsharp/Tests/Tests.csproj b/csharp-basic-topics/DeprecationInCsharp/Tests/Tests.csproj
index 6458a52579..4ed08a7483 100644
--- a/csharp-basic-topics/DeprecationInCsharp/Tests/Tests.csproj
+++ b/csharp-basic-topics/DeprecationInCsharp/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>
 
@@ -10,13 +10,13 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
-        <PackageReference Include="xunit" Version="2.4.2" />
-        <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.11.0" />
+        <PackageReference Include="xunit" Version="2.9.3" />
+        <PackageReference Include="xunit.runner.visualstudio" Version="4.0.1">
             <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>