davidnmbond · Sep 28, 2026 · Sep 27, 2026
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -16,10 +16,12 @@ jobs:
       with:
         fetch-depth: 0
 
+    # global.json pins the SDK with rollForward disable, so install exactly that
+    # version rather than whatever 10.0.x happens to be latest.
     - name: Setup .NET
       uses: actions/setup-dotnet@v6
       with:
-        dotnet-version: 10.0.x
+        global-json-file: global.json
 
     - name: Restore
       run: dotnet restore
@@ -36,6 +38,77 @@ jobs:
         name: packages
         path: ./artifacts/*.nupkg
 
+  # Collects line coverage and publishes it to Codacy. Runs on the self-hosted
+  # pdl-public scale set rather than a GitHub-hosted runner.
+  # pdl-public is the hardened scale set that may serve a public repository: a
+  # fork pull request is untrusted code, so it has no dind, no privileged
+  # container, no hostPath and nothing shared between jobs.
+  #
+  # Only tests that need no credentials run here. Every current test uses a
+  # mocked HttpMessageHandler, so none calls live Slack; any future test that
+  # needs a real webhook URL must carry [Trait("Category", "Integration")],
+  # which the filter below excludes.
+  coverage:
+    runs-on: [pdl-public]
+
+    env:
+      DOTNET_NOLOGO: 1
+      DOTNET_CLI_TELEMETRY_OPTOUT: 1
+      # The actions-runner image does not offer the Node version several of these
+      # actions request by default; without this they fail before their first step.
+      FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v7
+      with:
+        fetch-depth: 0 # Nerdbank.GitVersioning needs the full history.
+
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v6
+      env:
+        # The runner user cannot write /usr/share/dotnet, the default install location.
+        DOTNET_INSTALL_DIR: ${{ runner.temp }}/dotnet
+      with:
+        global-json-file: global.json
+
+    - name: Build tests
+      run: dotnet build Slack.Webhooks.Tests/PanoramicData.Slack.Webhooks.Tests.csproj --configuration Debug
+
+    # The test project is a Microsoft.Testing.Platform application
+    # (UseMicrosoftTestingPlatformRunner), so coverage is collected by running the
+    # test executable directly with Microsoft.Testing.Extensions.CodeCoverage rather
+    # than through `dotnet test`. On Linux the executable has no .exe extension.
+    # coverage.config ports coverlet's generated-code exclusions so figures stay
+    # comparable across the estate.
+    - name: Run tests with coverage
+      run: >-
+        ./Slack.Webhooks.Tests/bin/Debug/net10.0/PanoramicData.Slack.Webhooks.Tests
+        --filter-not-trait "Category=Integration"
+        --coverage
+        --coverage-settings coverage.config
+        --coverage-output-format cobertura
+        --coverage-output coverage.cobertura.xml
+
+    # continue-on-error: a Codacy outage must not turn a passing test run red. The
+    # trade-off is that an expired or missing project token fails silently, so
+    # check the step log for "Coverage received successfully".
+    - name: Upload coverage to Codacy
+      continue-on-error: true
+      uses: codacy/codacy-coverage-reporter-action@v1
+      with:
+        project-token: ${{ secrets.CODACY_PROJECT_TOKEN }}
+        coverage-reports: Slack.Webhooks.Tests/bin/Debug/net10.0/TestResults/coverage.cobertura.xml
+
+    - name: Upload coverage artifact
+      if: always()
+      continue-on-error: true
+      uses: actions/upload-artifact@v7
+      with:
+        name: coverage
+        path: Slack.Webhooks.Tests/bin/Debug/net10.0/TestResults/coverage.cobertura.xml
+        retention-days: 7
+
   publish:
     needs: build
     runs-on: ubuntu-latest
@@ -61,4 +134,4 @@ jobs:
         user: david_n_m_bond
 
     - name: Push to NuGet
-      run: dotnet nuget push ./artifacts/*.nupkg --api-key ${{ steps.login.outputs.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json --skip-duplicate
+      run: dotnet nuget push ./artifacts/*.nupkg --api-key ${{ steps.login.outputs.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json --skip-duplicate
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -26,6 +26,7 @@ Thank you for your interest in contributing to this project!
 - Use xUnit v3 for all tests
 - Use AwesomeAssertions for fluent assertions
 - Ensure all existing tests pass before submitting a PR
+- Tests that call live Slack or need a real webhook URL must carry `[Trait("Category", "Integration")]`; CI's coverage job excludes them because it runs without credentials
 
 ## License
 

diff --git a/Directory.Packages.props b/Directory.Packages.props
@@ -10,7 +10,6 @@
     <PackageVersion Include="Moq" Version="4.20.72" />
     <PackageVersion Include="Nerdbank.GitVersioning" Version="3.10.94" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.4" />
-    <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="4.0.0" />
     <PackageVersion Include="xunit.v3" Version="4.0.1" />
   </ItemGroup>

diff --git a/README.md b/README.md
@@ -8,16 +8,16 @@ Even simpler integration with Slack's Incoming/Outgoing webhooks API for .net
 
 ### IMPORTANT
 
-On Feb 19th 2020 Slack will end support for TLS version 1.0 and 1.1. This means you may (depending on your .NET version) need to force the use of TLS1.2.
+This package targets **.NET 10** (`net10.0`) only. Earlier releases targeted .NET Standard 2.0, which also made them usable from .NET Framework; that is no longer the case. Projects on .NET Framework, or on a .NET version earlier than 10, should stay on the last .NET Standard 2.0 release.
 
-If you receive an error stating that "The underlying connection was closed:" it's quite possibly a TLS issue. You can work around this by setting the default TLS version using the following:
-
-```csharp
-System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
-```
+Slack ended support for TLS 1.0 and 1.1 on 19 February 2020. .NET 10 negotiates TLS 1.2 or later by default, so no `ServicePointManager` workaround is needed.
 
 ### Change Log
 
+#### Unreleased
+
+- Target .NET 10 only; drop .NET Standard 2.0 (and therefore .NET Framework) support
+
 #### v1.1.4
 
 - Add Block elements to Attachments
@@ -56,7 +56,7 @@ Requirements:
 
 1. You must first enable the Webhooks integration for your Slack Account to get the Token. You can enable it here: https://slack.com/services/new/incoming-webhook
 2. Slack.Webhooks depends on JSON.net
-3. Compatible with .NET 4.5+ and .NET Core. If you need .NET 3.5/4 you can use an older release, but this may be out of date.
+3. Requires .NET 10 or later.
 
 Download:
 
@@ -66,12 +66,6 @@ Package is hosted on [Nuget](https://www.nuget.org/packages/Slack.Webhooks/) and
 PM> Install-Package Slack.Webhooks
 ```
 
-For older .NET framework support:
-
-```
-PM> Install-Package Slack.Webhooks -Version 0.1.8
-```
-
 Then, create a SlackClient with your Webhook URL.
 
 ```csharp

diff --git a/Slack.Webhooks.Tests/EmojiShould.cs b/Slack.Webhooks.Tests/EmojiShould.cs
@@ -25,7 +25,7 @@ public void DeserializeToObject()
 		var deserialized = JsonConvert.DeserializeObject<string>("\":ghost:\"");
 
 		//assert
-		Assert.Equal(Emoji.Ghost.ToString(), deserialized.ToString());
+		Assert.Equal(Emoji.Ghost.ToString(), deserialized);
 	}
 
 	[Fact]

diff --git a/Slack.Webhooks.Tests/PanoramicData.Slack.Webhooks.Tests.csproj b/Slack.Webhooks.Tests/PanoramicData.Slack.Webhooks.Tests.csproj
@@ -4,31 +4,25 @@
     <Deterministic>False</Deterministic>
     <GenerateAssemblyInfo>False</GenerateAssemblyInfo>
     <TargetFramework>net10.0</TargetFramework>
+    <OutputType>Exe</OutputType>
+    <UseMicrosoftTestingPlatformRunner>true</UseMicrosoftTestingPlatformRunner>
     <ImplicitUsings>enable</ImplicitUsings>
-    <!-- Test code uses NRT-unaware patterns (null initializers, mocked nullables); keep strict NRT for the library only. -->
-    <Nullable>disable</Nullable>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+    <GenerateDocumentationFile>false</GenerateDocumentationFile>
   </PropertyGroup>
   <ItemGroup>
-    <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
-  </ItemGroup>
-  <ItemGroup>
-    <ProjectReference Include="..\Slack.Webhooks\PanoramicData.Slack.Webhooks.csproj">
-      <Project>{53751b1b-a63e-4e4f-988c-bc783e68b15f}</Project>
-      <Name>Slack.Webhooks</Name>
-    </ProjectReference>
-  </ItemGroup>
-  <ItemGroup>
-    <None Include="packages.config" />
+    <ProjectReference Include="..\Slack.Webhooks\PanoramicData.Slack.Webhooks.csproj" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" />
     <PackageReference Include="Moq" />
-    <PackageReference Include="xunit" />
+    <PackageReference Include="xunit.v3" />
     <PackageReference Include="xunit.runner.visualstudio">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="AwesomeAssertions" />
     <PackageReference Include="Microsoft.Testing.Extensions.CodeCoverage" PrivateAssets="all" />
   </ItemGroup>
-</Project>
+</Project>
diff --git a/Slack.Webhooks.Tests/SlackClientFixtures.cs b/Slack.Webhooks.Tests/SlackClientFixtures.cs
@@ -91,9 +91,10 @@ public void ShouldContainSerializedMessage()
 	{
 		//arrange
 		const string hookUrl = "https://hooks.slack.com/invalid";
-		SlackMessage postedMessage = null;
+		SlackMessage? postedMessage = null;
 		var httpMessageHandler = GetMockHttpMessageHandler(callback: (req, token) =>
 		{
+			Assert.NotNull(req.Content);
 			var json = req.Content.ReadAsStringAsync(token).GetAwaiter().GetResult();
 			postedMessage = SlackClient.DeserializeObject(json);
 		});
@@ -121,8 +122,11 @@ public void ShouldPostToMultipleChannels()
 		var channelsPostedTo = new List<string>();
 		var httpMessageHandler = GetMockHttpMessageHandler(callback: (req, token) =>
 		{
-			var json = req.Content.ReadAsStringAsync().GetAwaiter().GetResult();
+			Assert.NotNull(req.Content);
+			var json = req.Content.ReadAsStringAsync(token).GetAwaiter().GetResult();
 			var postedMessage = SlackClient.DeserializeObject(json);
+			Assert.NotNull(postedMessage);
+			Assert.NotNull(postedMessage.Channel);
 			channelsPostedTo.Add(postedMessage.Channel);
 		});
 
@@ -142,7 +146,7 @@ public void ShouldPostToMultipleChannels()
 		}
 	}
 
-	private static Mock<HttpMessageHandler> GetMockHttpMessageHandler(string response = "OK", Action<HttpRequestMessage, CancellationToken> callback = null)
+	private static Mock<HttpMessageHandler> GetMockHttpMessageHandler(string response = "OK", Action<HttpRequestMessage, CancellationToken>? callback = null)
 	{
 		callback ??= new Action<HttpRequestMessage, CancellationToken>(delegate (HttpRequestMessage m, CancellationToken t) { });
 

diff --git a/Slack.Webhooks.Tests/packages.config b/Slack.Webhooks.Tests/packages.config
diff --git a/Slack.Webhooks/PanoramicData.Slack.Webhooks.csproj b/Slack.Webhooks/PanoramicData.Slack.Webhooks.csproj
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0</TargetFrameworks>
+    <TargetFramework>net10.0</TargetFramework>
     <LangVersion>latest</LangVersion>
     <AnalysisLevel>latest-recommended</AnalysisLevel>
     <AnalysisMode>recommended</AnalysisMode>
@@ -20,14 +20,13 @@
     <PackageIcon>slack.png</PackageIcon>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <PackageTags>slack;webhook;webhooks</PackageTags>
-    <PackageReleaseNotes>First release as .NET Standard 2.0</PackageReleaseNotes>
+    <PackageReleaseNotes>Now targets .NET 10 only. .NET Standard 2.0, and therefore .NET Framework, is no longer supported.</PackageReleaseNotes>
     <IncludeSymbols>True</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageId>PanoramicData.Slack.Webhooks</PackageId>
     <ImplicitUsings>enable</ImplicitUsings>
     <NeutralResourcesLanguage>en</NeutralResourcesLanguage>
-    <TargetFramework>net10.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <Content Include="Panoramic Data.ico" />

diff --git a/Slack.Webhooks/SlackClient.cs b/Slack.Webhooks/SlackClient.cs
@@ -30,8 +30,9 @@ public class SlackClient : ISlackClient, IDisposable
 	public SlackClient(string webhookUrl, int timeoutMs = 100, HttpClient? httpClient = null)
 	{
 		_httpClient = httpClient ?? new HttpClient();
-		if (!Uri.TryCreate(webhookUrl, UriKind.Absolute, out _webhookUri))
+		if (!Uri.TryCreate(webhookUrl, UriKind.Absolute, out var webhookUri))
 			throw new ArgumentException("Please enter a valid webhook url");
+		_webhookUri = webhookUri;
 		_timeoutMs = timeoutMs;
 	}
 

diff --git a/coverage.config b/coverage.config
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Microsoft.Testing.Extensions.CodeCoverage settings.
+
+  The attribute exclusions are not optional if figures are to stay comparable across the estate: the
+  Microsoft collector includes generated code by default, where coverlet excluded it. Porting them is
+  worth several points of apparent coverage on a repository with generated clients.
+-->
+<Configuration>
+  <CodeCoverage>
+    <ModulePaths>
+      <Exclude>
+        <ModulePath>.*Test\.dll$</ModulePath>
+        <ModulePath>.*Tests\.dll$</ModulePath>
+      </Exclude>
+    </ModulePaths>
+    <Attributes>
+      <Exclude>
+        <Attribute>^System\.Diagnostics\.CodeAnalysis\.ExcludeFromCodeCoverageAttribute$</Attribute>
+        <Attribute>^System\.Runtime\.CompilerServices\.CompilerGeneratedAttribute$</Attribute>
+        <Attribute>^System\.CodeDom\.Compiler\.GeneratedCodeAttribute$</Attribute>
+        <Attribute>^System\.ObsoleteAttribute$</Attribute>
+      </Exclude>
+    </Attributes>
+    <Sources>
+      <Exclude>
+        <Source>.*\\obj\\.*</Source>
+      </Exclude>
+    </Sources>
+    <UseVerifiableInstrumentation>False</UseVerifiableInstrumentation>
+    <CollectFromChildProcesses>True</CollectFromChildProcesses>
+  </CodeCoverage>
+</Configuration>
diff --git a/global.json b/global.json
@@ -1,7 +1,7 @@
 {
   "sdk": {
-    "version": "10.0.400",
-    "rollForward": "latestMinor"
+    "version": "10.0.401",
+    "rollForward": "disable"
   },
   "test": {
     "runner": "Microsoft.Testing.Platform"