[repo] Replace .NET6 target with .NET9

.editorconfig

@@ -41,7 +41,7 @@ csharp_indent_labels = flush_left
 
 # Modifier preferences
 csharp_preferred_modifier_order = public,private,protected,internal,file,static,extern,new,virtual,abstract,sealed,override,readonly,unsafe,required,volatile,async:suggestion
-dotnet_style_require_accessibility_modifiers = for_non_interface_members:silent
+dotnet_style_require_accessibility_modifiers = for_non_interface_members:suggestion
 
 # this. preferences
 dotnet_style_qualification_for_field = true:suggestion
@@ -53,8 +53,8 @@ dotnet_style_qualification_for_event = true:suggestion
 csharp_style_var_for_built_in_types = true:silent
 csharp_style_var_when_type_is_apparent = true:silent
 csharp_style_var_elsewhere = true:silent
-dotnet_style_predefined_type_for_locals_parameters_members = true:silent
-dotnet_style_predefined_type_for_member_access = true:silent
+dotnet_style_predefined_type_for_locals_parameters_members = true:suggestion
+dotnet_style_predefined_type_for_member_access = true:suggestion
 
 # name all constant fields using PascalCase
 dotnet_naming_rule.constant_fields_should_be_pascal_case.severity = suggestion
@@ -75,28 +75,31 @@ dotnet_style_readonly_field = true:suggestion
 csharp_style_implicit_object_creation_when_type_is_apparent = true:suggestion
 dotnet_style_prefer_simplified_interpolation = true:suggestion
 dotnet_style_object_initializer = true:suggestion
+csharp_style_prefer_primary_constructors = false:none
 
 # Expression-level preferences
 dotnet_style_object_initializer = true:suggestion
 dotnet_style_collection_initializer = true:suggestion
 dotnet_style_explicit_tuple_names = true:suggestion
 dotnet_style_coalesce_expression = true:suggestion
 dotnet_style_null_propagation = true:suggestion
-dotnet_style_prefer_is_null_check_over_reference_equality_method = true:silent
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true:suggestion
 dotnet_style_prefer_inferred_tuple_names = true:suggestion
 dotnet_style_prefer_inferred_anonymous_type_member_names = true:suggestion
-dotnet_style_prefer_auto_properties = true:silent
-dotnet_style_prefer_conditional_expression_over_assignment = true:silent
-dotnet_style_prefer_conditional_expression_over_return = true:silent
+dotnet_style_prefer_auto_properties = true:suggestion
+dotnet_style_prefer_conditional_expression_over_assignment = true:suggestion
+dotnet_style_prefer_conditional_expression_over_return = true:suggestion
 csharp_prefer_simple_default_expression = true:suggestion
+csharp_style_unused_value_expression_statement_preference = discard_variable:none
 
 # Expression-bodied members
-csharp_style_expression_bodied_methods = false:silent
-csharp_style_expression_bodied_constructors = false:silent
-csharp_style_expression_bodied_operators = false:silent
-csharp_style_expression_bodied_properties = true:silent
-csharp_style_expression_bodied_indexers = true:silent
-csharp_style_expression_bodied_accessors = true:silent
+csharp_style_expression_bodied_methods = true:suggestion
+dotnet_diagnostic.IDE0022.severity = suggestion # dotnet format doesn't respect the suggestion in the line above
+csharp_style_expression_bodied_constructors = false:warning
+csharp_style_expression_bodied_operators = true:suggestion
+csharp_style_expression_bodied_properties = true:suggestion
+csharp_style_expression_bodied_indexers = true:suggestion
+csharp_style_expression_bodied_accessors = true:suggestion
 
 # Pattern matching
 csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
@@ -113,6 +116,7 @@ csharp_style_prefer_range_operator = false:none
 csharp_style_pattern_local_over_anonymous_function = true:suggestion
 csharp_style_deconstructed_variable_declaration = true:suggestion
 csharp_style_namespace_declarations = file_scoped:warning
+dotnet_style_namespace_match_folder = false:none
 
 # Space preferences
 csharp_space_after_cast = false
@@ -128,10 +132,10 @@ csharp_space_between_method_declaration_parameter_list_parentheses = false
 csharp_space_between_parentheses = false
 
 # Parentheses preferences
-dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity:silent
-dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity:silent
-dotnet_style_parentheses_in_other_binary_operators = always_for_clarity:silent
-dotnet_style_parentheses_in_other_operators = never_if_unnecessary:silent
+dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity:suggestion
+dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity:suggestion
+dotnet_style_parentheses_in_other_binary_operators = always_for_clarity:suggestion
+dotnet_style_parentheses_in_other_operators = never_if_unnecessary:suggestion
 
 # Code analyzers
 # CA1031: Do not catch general exception types

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -48,7 +48,7 @@ body:
   - type: input
     attributes:
       label: Runtime Version
-      description: What .NET runtime version did you use? (e.g. `net462`, `net48`, `netcoreapp3.1`, `net6.0` etc. You can find this information from the `*.csproj` file)
+      description: What .NET runtime version did you use? (e.g. `net462`, `net48`, `net8.0`, etc. You can find this information from the `*.csproj` file)
     validations:
       required: true
 

.github/workflows/Component.BuildTest.yml

@@ -24,7 +24,7 @@ on:
         required: false
         type: string
       tfm-list:
-        default: '[ "net462", "net6.0", "net8.0" ]'
+        default: '[ "net462", "net8.0", "net9.0" ]'
         required: false
         type: string
 
@@ -42,7 +42,7 @@ jobs:
         - os: otel-linux-arm64
           version: net462
         - os: otel-linux-arm64
-          version: net6.0
+          version: net8.0
 
     runs-on: ${{ matrix.os }}
     steps:

.github/workflows/ci.yml

@@ -111,7 +111,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [ net6.0, net8.0 ]
+        version: [ net8.0, net9.0 ]
     steps:
       - uses: actions/checkout@v4
       - name: Run OTLP Exporter docker compose
@@ -129,7 +129,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [ net6.0, net8.0 ]
+        version: [ net8.0, net9.0 ]
     steps:
       - uses: actions/checkout@v4
       - name: Run W3C Trace Context docker compose

.github/workflows/docfx.yml

@@ -13,6 +13,9 @@ jobs:
     - name: check out code
       uses: actions/checkout@v4
 
+    - name: Setup dotnet
+      uses: actions/setup-dotnet@v4
+
     - name: install docfx
       run: dotnet tool install -g docfx
 

.github/workflows/verifyaotcompat.yml

@@ -12,7 +12,7 @@ jobs:
       fail-fast: false # ensures the entire test matrix is run, even if one permutation fails
       matrix:
         os: [ ubuntu-latest, windows-latest ]
-        version: [ net8.0 ]
+        version: [ net8.0, net9.0 ]
 
     runs-on: ${{ matrix.os }}
     steps:

CONTRIBUTING.md

@@ -44,7 +44,7 @@ You can contribute to this project from a Windows, macOS or Linux machine.
 On all platforms, the minimum requirements are:
 
 * Git client and command line tools.
-* .NET 8.0
+* .NET 9.0
 
 ### Linux or MacOS
 

Directory.Packages.props

@@ -97,10 +97,10 @@
     <PackageVersion Include="xunit.runner.visualstudio" Version="[2.8.2,3.0)" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
-    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="6.0.33" />
-  </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'net8.0'">
     <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="8.0.8" />
   </ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)' == 'net9.0'">
+    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="9.0.0-rc.1.24452.1" />
+  </ItemGroup>
 </Project>

OpenTelemetry.sln

@@ -31,8 +31,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "build", "build", "{7CB2F02E
 		build\debug.snk = build\debug.snk
 		Directory.Packages.props = Directory.Packages.props
 		build\docfx.cmd = build\docfx.cmd
-		build\docker-compose.net6.0.yml = build\docker-compose.net6.0.yml
 		build\docker-compose.net8.0.yml = build\docker-compose.net8.0.yml
+		build\docker-compose.net9.0.yml = build\docker-compose.net9.0.yml
 		build\GlobalAttrExclusions.txt = build\GlobalAttrExclusions.txt
 		build\opentelemetry-icon-color.png = build\opentelemetry-icon-color.png
 		build\OpenTelemetry.prod.loose.ruleset = build\OpenTelemetry.prod.loose.ruleset

build/Common.nonprod.props

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <DefaultTargetFrameworkForExampleApps>net8.0</DefaultTargetFrameworkForExampleApps>
+    <DefaultTargetFrameworkForExampleApps>net9.0</DefaultTargetFrameworkForExampleApps>
   </PropertyGroup>
 
   <PropertyGroup Condition="$(MSBuildProjectName.EndsWith('.Tests'))">

build/Common.prod.props

@@ -33,6 +33,13 @@
     <ContinuousIntegrationBuild Condition="'$(Deterministic)'=='true'">true</ContinuousIntegrationBuild>
   </PropertyGroup>
 
+  <ItemGroup>
+    <!-- Note: Disable net6.0 target for package validation because it has been
+    removed. It should be possible to remove this once a stable version has been
+    released to NuGet without net6.0. -->
+    <PackageValidationBaselineFrameworkToIgnore Include="net6.0" />
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="MinVer" PrivateAssets="All" Condition="'$(IntegrationBuild)' != 'true'" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" PrivateAssets="All" Condition="'$(IntegrationBuild)' != 'true'" />

build/Common.props

@@ -28,18 +28,18 @@
     <NetFrameworkSupportedVersions>net481;net48;net472;net471;net47;net462</NetFrameworkSupportedVersions>
 
     <!-- production TFMs -->
-    <TargetFrameworksForLibraries>net8.0;net6.0;netstandard2.0;$(NetFrameworkMinimumSupportedVersion)</TargetFrameworksForLibraries>
-    <TargetFrameworksForLibrariesExtended>net8.0;net6.0;netstandard2.1;netstandard2.0;$(NetFrameworkMinimumSupportedVersion)</TargetFrameworksForLibrariesExtended>
-    <TargetFrameworksForPrometheusAspNetCore>net8.0;net6.0</TargetFrameworksForPrometheusAspNetCore>
+    <TargetFrameworksForLibraries>net9.0;net8.0;netstandard2.0;$(NetFrameworkMinimumSupportedVersion)</TargetFrameworksForLibraries>
+    <TargetFrameworksForLibrariesExtended>net9.0;net8.0;netstandard2.1;netstandard2.0;$(NetFrameworkMinimumSupportedVersion)</TargetFrameworksForLibrariesExtended>
+    <TargetFrameworksForPrometheusAspNetCore>net9.0;net8.0</TargetFrameworksForPrometheusAspNetCore>
 
     <!-- non-production TFMs -->
-    <TargetFrameworksForAspNetCoreTests>net8.0;net6.0</TargetFrameworksForAspNetCoreTests>
-    <TargetFrameworksForAotCompatibilityTests>net8.0</TargetFrameworksForAotCompatibilityTests>
-    <TargetFrameworksForDocs>net8.0;net6.0</TargetFrameworksForDocs>
+    <TargetFrameworksForAspNetCoreTests>net9.0;net8.0</TargetFrameworksForAspNetCoreTests>
+    <TargetFrameworksForAotCompatibilityTests>net9.0;net8.0</TargetFrameworksForAotCompatibilityTests>
+    <TargetFrameworksForDocs>net9.0;net8.0</TargetFrameworksForDocs>
     <TargetFrameworksForDocs Condition="$(OS) == 'Windows_NT' And '$(UsingMicrosoftNETSdkWeb)' != 'True'">
       $(TargetFrameworksForDocs);$(NetFrameworkSupportedVersions)
     </TargetFrameworksForDocs>
-    <TargetFrameworksForTests>net8.0;net6.0</TargetFrameworksForTests>
+    <TargetFrameworksForTests>net9.0;net8.0</TargetFrameworksForTests>
     <TargetFrameworksForTests Condition="$(OS) == 'Windows_NT'">
       $(TargetFrameworksForTests);$(NetFrameworkMinimumSupportedVersion)
     </TargetFrameworksForTests>

build/docker-compose.net8.0.yml

@@ -6,4 +6,4 @@ services:
       args:
         PUBLISH_FRAMEWORK: net8.0
         TEST_SDK_VERSION: "8.0"
-        BUILD_SDK_VERSION: "8.0"
+        BUILD_SDK_VERSION: "9.0"

build/docker-compose.net9.0.yml

@@ -0,0 +1,9 @@
+version: '3.7'
+
+services:
+  tests:
+    build:
+      args:
+        PUBLISH_FRAMEWORK: net9.0
+        TEST_SDK_VERSION: "9.0"
+        BUILD_SDK_VERSION: "9.0"

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
     "rollForward": "latestFeature",
-    "version": "8.0.100"
+    "version": "9.0.100-rc.1.24452.12"
   }
 }

src/OpenTelemetry/Internal/SelfDiagnosticsConfigParser.cs

@@ -66,7 +66,9 @@ public bool TryGetConfiguration(
                 this.configBuffer = buffer;
             }
 
-            file.Read(buffer, 0, buffer.Length);
+            // TODO: Fix CA2022 - Avoid inexact read with 'System.IO.FileStream.Read(byte[], int, int)'
+            // Added _ = as a workaround to suppress the warning
+            _ = file.Read(buffer, 0, buffer.Length);
             string configJson = Encoding.UTF8.GetString(buffer);
 
             if (!TryParseLogDirectory(configJson, out logDirectory))

test/OpenTelemetry.Instrumentation.W3cTraceContext.Tests/Dockerfile

@@ -2,8 +2,8 @@
 # This should be run from the root of the repo:
 # docker build --file test/OpenTelemetry.Instrumentation.W3cTraceContext.Tests/Dockerfile .
 
-ARG BUILD_SDK_VERSION=8.0
-ARG TEST_SDK_VERSION=8.0
+ARG BUILD_SDK_VERSION=9.0
+ARG TEST_SDK_VERSION=9.0
 
 FROM ubuntu AS w3c
 #Install git
@@ -13,7 +13,7 @@ RUN git clone --branch level-1 https://github.com/w3c/trace-context.git
 
 FROM mcr.microsoft.com/dotnet/sdk:${BUILD_SDK_VERSION} AS build
 ARG PUBLISH_CONFIGURATION=Release
-ARG PUBLISH_FRAMEWORK=net8.0
+ARG PUBLISH_FRAMEWORK=net9.0
 WORKDIR /repo
 COPY . ./
 WORKDIR "/repo/test/OpenTelemetry.Instrumentation.W3cTraceContext.Tests"

test/OpenTelemetry.Tests/Internal/SelfDiagnosticsEventListenerTest.cs

@@ -124,7 +124,9 @@ public void SelfDiagnosticsEventListener_EmitEvent_OmitAsConfigured()
 
         using FileStream file = File.Open(LOGFILEPATH, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete);
         var buffer = new byte[256];
-        file.Read(buffer, 0, buffer.Length);
+
+        // Suppress CA2022 error: Avoid inexact read with 'System.IO.FileStream.Read(byte[], int, int)'
+        _ = file.Read(buffer, 0, buffer.Length);
         Assert.Equal('\0', (char)buffer[0]);
     }
 
@@ -256,7 +258,9 @@ private static void AssertFileOutput(string filePath, string eventMessage)
     {
         using FileStream file = File.Open(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete);
         var buffer = new byte[256];
-        file.Read(buffer, 0, buffer.Length);
+
+        // Suppress CA2022 error: Avoid inexact read with 'System.IO.FileStream.Read(byte[], int, int)'
+        _ = file.Read(buffer, 0, buffer.Length);
         string logLine = Encoding.UTF8.GetString(buffer);
         string logMessage = ParseLogMessage(logLine);
         Assert.StartsWith(eventMessage, logMessage);