chore: Add .NET 9 targeting (#1274)

+semver: minor

.editorconfig

@@ -1,7 +1,7 @@
 # top-most EditorConfig file
 root = true
 
-# global baselines
+#### Core EditorConfig Options ####
 [*]
 charset = utf-8
 end_of_line = lf
@@ -11,117 +11,134 @@ indent_size = 2
 tab_width = 2
 
 line_length = 150
-max_line_length = 150
 trim_trailing_whitespace = true
 insert_final_newline = true
 
-[*.{csproj,props,targets}]
-indent_style = space
-indent_size = 2
-
-[*.yml]
-indent_style = space
-indent_size = 2
-
-[*.{cs,vb}]
-tab_width = 4
+# .NET Globals
+[*.cs]
 indent_size = 4
-end_of_line = lf
-
-#### Naming styles ####
+tab_width = 4
 
-# Naming rules
+#### .NET Coding Conventions ####
+# https://learn.microsoft.com/dotnet/fundamentals/code-analysis/overview
 
-dotnet_naming_rule.interface_should_be_begins_with_i.severity = suggestion
-dotnet_naming_rule.interface_should_be_begins_with_i.symbols = interface
-dotnet_naming_rule.interface_should_be_begins_with_i.style = begins_with_i
+# Organize usings
+dotnet_separate_import_directive_groups = false
+dotnet_sort_system_directives_first = true
+file_header_template = unset
 
-dotnet_naming_rule.types_should_be_pascal_case.severity = suggestion
-dotnet_naming_rule.types_should_be_pascal_case.symbols = types
-dotnet_naming_rule.types_should_be_pascal_case.style = pascal_case
+# Modifier preferences
+dotnet_style_require_accessibility_modifiers = for_non_interface_members
 
-dotnet_naming_rule.non_field_members_should_be_pascal_case.severity = suggestion
-dotnet_naming_rule.non_field_members_should_be_pascal_case.symbols = non_field_members
-dotnet_naming_rule.non_field_members_should_be_pascal_case.style = pascal_case
+# Expression-level preferences
+dotnet_style_coalesce_expression = true:suggestion
+dotnet_style_collection_initializer = true:suggestion
+dotnet_style_explicit_tuple_names = true:suggestion
+dotnet_style_namespace_match_folder = false:none
+dotnet_style_null_propagation = true:suggestion
+dotnet_style_object_initializer = true:suggestion
+dotnet_style_prefer_auto_properties = true:suggestion
+dotnet_style_prefer_compound_assignment = true
+dotnet_style_prefer_conditional_expression_over_assignment = true
+dotnet_style_prefer_conditional_expression_over_return = true
+dotnet_style_prefer_foreach_explicit_cast_in_source = when_strongly_typed
+dotnet_style_prefer_inferred_anonymous_type_member_names = true
+dotnet_style_prefer_inferred_tuple_names = true
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true:suggestion
+dotnet_style_prefer_simplified_boolean_expressions = true
+dotnet_style_prefer_simplified_interpolation = true
 
-# Symbol specifications
+# Collection expression preferences
+dotnet_style_prefer_collection_expression = true:suggestion
+dotnet_diagnostic.IDE0305.severity = none # exclude collection expression for fluent
+csharp_space_between_square_brackets = false
+csharp_space_between_empty_square_brackets = false
+
+# Parentheses preferences
+dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity
+dotnet_style_parentheses_in_other_binary_operators = always_for_clarity
+dotnet_style_parentheses_in_other_operators = never_if_unnecessary
+dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity
+
+# Code block and new line preferences
+dotnet_style_prefer_braces = true:suggestion
+dotnet_style_operator_placement_when_wrapping = beginning_of_line
+dotnet_style_allow_multiple_blank_lines_experimental = true
+dotnet_style_allow_statement_immediately_after_block_experimental = false
 
-dotnet_naming_symbols.interface.applicable_kinds = interface
-dotnet_naming_symbols.interface.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
-dotnet_naming_symbols.interface.required_modifiers =
+# Wrapping preferences
+csharp_preserve_single_line_blocks = true
+csharp_preserve_single_line_statements = true
 
-dotnet_naming_symbols.types.applicable_kinds = class, struct, interface, enum
-dotnet_naming_symbols.types.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
-dotnet_naming_symbols.types.required_modifiers =
+# Field preferences
+dotnet_style_readonly_field = true
 
-dotnet_naming_symbols.non_field_members.applicable_kinds = property, event, method
-dotnet_naming_symbols.non_field_members.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
-dotnet_naming_symbols.non_field_members.required_modifiers =
+# Assignment preferences
+dotnet_code_quality_unused_parameters = warning
+dotnet_code_quality_unused_value = warning
 
-# Naming styles
+# Suppression preferences
+dotnet_remove_unnecessary_suppression_exclusions = suggestion
 
+# Naming conventions
+dotnet_naming_style.pascal_case.capitalization = pascal_case
 dotnet_naming_style.begins_with_i.required_prefix = I
-dotnet_naming_style.begins_with_i.required_suffix =
-dotnet_naming_style.begins_with_i.word_separator =
 dotnet_naming_style.begins_with_i.capitalization = pascal_case
+dotnet_code_quality_explicit_tuple_names = true:suggestion
+dotnet_style_predefined_type_for_locals_parameters_members = true:suggestion
 
-dotnet_naming_style.pascal_case.required_prefix =
-dotnet_naming_style.pascal_case.required_suffix =
-dotnet_naming_style.pascal_case.word_separator =
-dotnet_naming_style.pascal_case.capitalization = pascal_case
-
-dotnet_naming_style.pascal_case.required_prefix =
-dotnet_naming_style.pascal_case.required_suffix =
-dotnet_naming_style.pascal_case.word_separator =
-dotnet_naming_style.pascal_case.capitalization = pascal_case
-
-dotnet_code_quality_unused_parameters = all:suggestion
+#### C# Coding Conventions ####
+# https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/csharp-formatting-options
 
-dotnet_sort_system_directives_first = true
-
-dotnet_style_operator_placement_when_wrapping = beginning_of_line
-dotnet_style_predefined_type_for_locals_parameters_members = true:silent
-dotnet_style_namespace_match_folder = false:none
-dotnet_style_coalesce_expression = true:suggestion
-dotnet_style_null_propagation = true:suggestion
-dotnet_style_prefer_is_null_check_over_reference_equality_method = true:suggestion
-dotnet_style_prefer_auto_properties = true:silent
-dotnet_style_object_initializer = true:suggestion
-dotnet_style_prefer_collection_expression = true:suggestion
-
-[*.cs]
-# ref: https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/style-rules/csharp-formatting-options
+# var preferences
+csharp_style_var_elsewhere = false
+csharp_style_var_for_built_in_types = false
+csharp_style_var_when_type_is_apparent = false
 
+# Labeling and using directives
 csharp_indent_labels = one_less_than_current
 csharp_using_directive_placement = outside_namespace:warning
-csharp_prefer_simple_using_statement = true:suggestion
 csharp_prefer_static_local_function = true:suggestion
 
+# Namespace and method preferences
 csharp_style_namespace_declarations = file_scoped:suggestion
 csharp_style_prefer_method_group_conversion = true:silent
 csharp_style_prefer_top_level_statements = true:silent
 csharp_style_prefer_primary_constructors = true:suggestion
+
+# Expression-bodied Members
 csharp_style_expression_bodied_methods = true: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_lambdas = true:silent
-csharp_style_expression_bodied_local_functions = false:silent
+
+# Function preferences
 csharp_style_prefer_local_over_anonymous_function = true:suggestion
-csharp_style_unused_value_assignment_preference = unused_local_variable:suggestion
 csharp_style_prefer_switch_expression = true:suggestion
 csharp_style_prefer_pattern_matching = true:silent
 csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
 csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
 csharp_style_prefer_not_pattern = true:suggestion
 csharp_style_prefer_extended_property_pattern = true:suggestion
+
+# Variable declarations
 csharp_style_inlined_variable_declaration = true:suggestion
+csharp_style_unused_value_assignment_preference = unused_local_variable:suggestion
+
+# Modifier preferences
+csharp_prefer_static_local_function = true
+csharp_preferred_modifier_order = public,private,protected,internal,file,static,extern,new,virtual,abstract,sealed,override,readonly,unsafe,required,volatile,async
+csharp_style_prefer_readonly_struct = true
+csharp_style_prefer_readonly_struct_member = true
 
-# braces
+# Code block preferences
 csharp_prefer_braces = true:suggestion
+csharp_prefer_simple_using_statement = true:suggestion
+csharp_type_declaration_braces = next_line
+csharp_empty_block_style = together_same_line
 
+# New line preferences
 csharp_new_line_before_open_brace = methods, properties, control_blocks, types
 csharp_new_line_before_else = true
 csharp_new_line_before_catch = true
@@ -130,11 +147,9 @@ csharp_new_line_before_members_in_object_initializers = false
 csharp_new_line_before_members_in_anonymous_types = false
 csharp_new_line_between_query_expression_clauses = false
 
-# braces overrides
-csharp_type_declaration_braces = next_line
-csharp_empty_block_style = together_same_line
-
-# diagnostic analyzers
-dotnet_diagnostic.CA1303.severity = none
-dotnet_diagnostic.CS1591.severity = silent
-dotnet_diagnostic.IDE0058.severity = none
+# Diagnostic analyzer suppressions
+dotnet_diagnostic.CA1303.severity  = none    # Passing literals as localized parameters
+dotnet_diagnostic.CA2263.severity  = none    # Prefer generic overload type parameter
+dotnet_diagnostic.CS1591.severity  = silent  # Missing XML comment for publicly visible type or member
+dotnet_diagnostic.IDE0058.severity = none    # Unused expression value
+dotnet_diagnostic.IDE0072.severity = silent  # Missing cases in switch statement

.github/workflows/deploy-package.yml

@@ -64,7 +64,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: "8.x"
+          dotnet-version: "9.x"
           dotnet-quality: "ga"
 
       - name: Build library
@@ -100,7 +100,7 @@ jobs:
             echo "| Minor       | ${{ steps.gitversion.outputs.minor }}           |"
             echo "| Patch       | ${{ steps.gitversion.outputs.patch }}           |"
             echo "| Base        | ${{ steps.gitversion.outputs.majorMinorPatch }} |"
-            echo "| Composed    | ${{ steps.compose.outputs.version }}   |"
+            echo "| Composed    | ${{ steps.compose.outputs.version }}            |"
           } >> $GITHUB_STEP_SUMMARY
 
   deploy:
@@ -130,7 +130,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: "8.x"
+          dotnet-version: "9.x"
           dotnet-quality: "ga"
 
       - name: Setup NuGet

.github/workflows/lint-pull-request.yml

@@ -47,7 +47,7 @@ jobs:
         if: always() && (steps.lint_pr_title.outputs.error_message != null)
         with:
           header: pr-title-lint-error
-          message: >
+          message: |
             ### Hey there and thank you for opening this pull request! 👋🏼
 
             It looks like your proposed **_Pull request title_** needs to be adjusted.

.github/workflows/test-codeql.yml

@@ -0,0 +1,52 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ "main", "v3" ]
+
+  pull_request:
+    branches: [ "main", "v3" ]
+
+  schedule:
+    - cron: '37 14 * * 3'
+
+jobs:
+
+  analyze:
+    name: analyze
+    runs-on: 'ubuntu-latest'
+
+    permissions:
+      security-events: write
+      packages: read
+      actions: read
+      contents: read
+
+    steps:
+
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v3
+      with:
+        languages: csharp
+        build-mode: manual
+
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: 9.x
+        dotnet-quality: "ga"
+
+    - name: Build library
+      run: >
+        dotnet build
+        --configuration Release
+        --property:ContinuousIntegrationBuild=true
+        -warnAsError
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v3
+      with:
+        category: "/language:csharp"

.github/workflows/test-examples.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: "8.x"
+          dotnet-version: "9.x"
           dotnet-quality: "ga"
 
       - name: Build examples

.github/workflows/test-indicators.yml

@@ -20,16 +20,18 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest, ubuntu-latest, macos-latest]
-        dotnet-version: ["2.0.x", "6.x", "8.x"]
+        dotnet-version: ["9.x"]
+        # TODO: restore when runners have 9.x on all
+        # ["2.1.x", "6.x", "9.x"]
 
     env:
 
       # identifying primary configuration so only one reports coverage
-      IS_PRIMARY: ${{ matrix.os == 'ubuntu-latest' && matrix.dotnet-version == '8.x' }}
+      IS_PRIMARY: ${{ matrix.os == 'ubuntu-latest' && matrix.dotnet-version == '9.x' }}
 
       # .NET SDK versions in the matrix that support `ga` quality spec
       #   versions before 5.x do not support it
-      SUPPORT_GA: ${{ contains(fromJson('["6.x", "8.x"]'), matrix.dotnet-version) }}
+      SUPPORT_GA: ${{ contains(fromJson('["6.x", "9.x"]'), matrix.dotnet-version) }}
 
     steps:
 

.github/workflows/test-performance.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: "8.x"
+          dotnet-version: "9.x"
           dotnet-quality: "ga"
 
       - name: Build library

.github/workflows/test-website-a11y.yml

@@ -23,7 +23,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           working-directory: docs
-          ruby-version: 3.2
+          ruby-version: 3.3
 
       - name: Install GEMs
         working-directory: docs

.github/workflows/test-website-links.yml

@@ -23,7 +23,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           working-directory: docs
-          ruby-version: 3.2
+          ruby-version: 3.3
 
       - name: Install GEMs
         working-directory: docs

docs/examples/Backtest/Backtest.csproj

@@ -2,12 +2,12 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Skender.Stock.Indicators" Version="2.5.0" />
+    <PackageReference Include="Skender.Stock.Indicators" Version="2.5.1" />
   </ItemGroup>
 
   <ItemGroup>