Code moved from private repo

src/.editorconfig

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+###############################
+# Core EditorConfig Options   #
+###############################
+
+root = true
+
+# All files
+[*]
+indent_style = space
+
+# Code files
+[*.{cs,csx,vb,vbx}]
+indent_size = 2
+insert_final_newline = true
+charset = utf-8-bom
+
+###############################
+# .NET Coding Conventions     #
+###############################
+
+[*.{cs,vb}]
+# Organize usings
+dotnet_sort_system_directives_first = true
+
+# this. preferences
+dotnet_style_qualification_for_field = false:none
+dotnet_style_qualification_for_property = false:none
+dotnet_style_qualification_for_method = false:none
+dotnet_style_qualification_for_event = false:none
+
+# Language keywords vs BCL types preferences
+dotnet_style_predefined_type_for_locals_parameters_members = true:none
+dotnet_style_predefined_type_for_member_access = true:none
+
+# 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
+
+# Modifier preferences
+dotnet_style_require_accessibility_modifiers = for_non_interface_members:none
+dotnet_style_readonly_field = true:suggestion
+
+# Expression-level preferences
+dotnet_style_object_initializer = true:suggestion
+dotnet_style_collection_initializer = true:suggestion
+dotnet_style_explicit_tuple_names = true:suggestion
+dotnet_style_null_propagation = true:suggestion
+dotnet_style_coalesce_expression = true:suggestion
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true:silent
+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
+
+###############################
+# Naming Conventions          #
+###############################
+
+# Style Definitions
+dotnet_naming_style.pascal_case_style.capitalization             = pascal_case
+
+# Use PascalCase for constant fields
+dotnet_naming_rule.constant_fields_should_be_pascal_case.severity = suggestion
+dotnet_naming_rule.constant_fields_should_be_pascal_case.symbols  = constant_fields
+dotnet_naming_rule.constant_fields_should_be_pascal_case.style    = pascal_case_style
+dotnet_naming_symbols.constant_fields.applicable_kinds            = field
+dotnet_naming_symbols.constant_fields.applicable_accessibilities  = *
+dotnet_naming_symbols.constant_fields.required_modifiers          = const
+
+###############################
+# C# Code Style Rules         #
+###############################
+
+[*.cs]
+# var preferences
+csharp_style_var_for_built_in_types = true:none
+csharp_style_var_when_type_is_apparent = true:none
+csharp_style_var_elsewhere = true:none
+
+# Expression-bodied members
+csharp_style_expression_bodied_methods = true:none
+csharp_style_expression_bodied_constructors = true:none
+csharp_style_expression_bodied_operators = true:none
+csharp_style_expression_bodied_properties = true:none
+csharp_style_expression_bodied_indexers = true:none
+csharp_style_expression_bodied_accessors = true:none
+
+# Pattern-matching preferences
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+
+# Null-checking preferences
+csharp_style_throw_expression = true:suggestion
+csharp_style_conditional_delegate_call = true:suggestion
+
+# Modifier preferences
+csharp_preferred_modifier_order = public,private,protected,internal,static,extern,new,virtual,abstract,sealed,override,readonly,unsafe,volatile,async:suggestion
+
+# Expression-level preferences
+csharp_prefer_braces = true:none
+csharp_style_deconstructed_variable_declaration = true:suggestion
+csharp_prefer_simple_default_expression = true:suggestion
+csharp_style_pattern_local_over_anonymous_function = true:suggestion
+csharp_style_inlined_variable_declaration = true:suggestion
+
+###############################
+# C# Formatting Rules         #
+###############################
+
+# New line preferences
+csharp_new_line_before_open_brace = all
+csharp_new_line_before_else = true
+csharp_new_line_before_catch = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_members_in_anonymous_types = true
+csharp_new_line_between_query_expression_clauses = true
+
+# Indentation preferences
+csharp_indent_case_contents = true
+csharp_indent_switch_labels = true
+csharp_indent_labels = flush_left
+
+# Space preferences
+csharp_space_after_cast = false
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_parentheses = false
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_around_binary_operators = before_and_after
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+
+# Wrapping preferences
+csharp_preserve_single_line_statements = true
+csharp_preserve_single_line_blocks = true
+
+##################################
+# Visual Basic Code Style Rules  #
+##################################
+
+[*.vb]
+# Modifier preferences
+visual_basic_preferred_modifier_order = Partial,Default,Private,Protected,Public,Friend,NotOverridable,Overridable,MustOverride,Overloads,Overrides,MustInherit,NotInheritable,Static,Shared,Shadows,ReadOnly,WriteOnly,Dim,Const,WithEvents,Widening,Narrowing,Custom,Async:suggestion

src/BindToConfig.UnitTests/AddBoundToConfig/AddBoundToConfig_Binds.cs

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+using System.Collections.Generic;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Xunit;
+
+namespace BindToConfig.UnitTests.AddBoundToConfig
+{
+  public class AddBoundToConfig_Binds
+  {
+    private const string AnyKey = "_";
+    private static readonly IConfiguration EmptyConfiguration = new ConfigurationBuilder().Build();
+    private readonly IServiceCollection _serviceCollection = new ServiceCollection();
+
+    [Fact]
+    public void Private_Setters()
+    {
+      // arrange
+      const string key = nameof(SampleConfiguration);
+      var expectedSampleConfiguration = new SampleConfiguration(100, "My string value");
+      var configurationBuilder = new ConfigurationBuilder();
+      configurationBuilder.AddInMemoryCollection(
+        new List<KeyValuePair<string, string>>
+        {
+          new KeyValuePair<string, string>(
+            key + ":" + nameof(expectedSampleConfiguration.IntValue),
+            expectedSampleConfiguration.IntValue.ToString()),
+          new KeyValuePair<string, string>(
+            key + ":" + nameof(expectedSampleConfiguration.StringValue),
+            expectedSampleConfiguration.StringValue)
+        });
+      var configuration = configurationBuilder.Build();
+      // act
+      _serviceCollection.AddBoundToConfig<SampleConfiguration>(configuration, key);
+      // assert
+      var provider = _serviceCollection.BuildServiceProvider(true);
+      var myOptions1 = provider.CreateScope().ServiceProvider.GetRequiredService<SampleConfiguration>();
+      Assert.Equal(expectedSampleConfiguration.IntValue, myOptions1.IntValue);
+      Assert.Equal(expectedSampleConfiguration.StringValue, myOptions1.StringValue);
+    }
+  }
+}

src/BindToConfig.UnitTests/AddBoundToConfig/AddBoundToConfig_FastFails.cs

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+using BindToConfig.Exceptions;
+using FluentAssertions;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Xunit;
+
+namespace BindToConfig.UnitTests.AddBoundToConfig
+{
+  public class AddBoundToConfig_FastFails
+  {
+    private const string AnyKey = "_";
+    private static readonly IConfiguration EmptyConfiguration = new ConfigurationBuilder().Build();
+    private readonly IServiceCollection _serviceCollection = new ServiceCollection();
+
+    [Fact]
+    public void By_Throwing_ConfigurationObjectCreationFailed_If_Instantiation_Of_Object_Is_Not_Possible()
+    {
+      // act
+      var exception = Assert.Throws<ObjectCreationFailed>(
+        () =>
+          new ServiceCollection().AddBoundToConfig<NotInstantiationClass>(
+            EmptyConfiguration,
+            AnyKey,
+            BindOptions.DontThrowIfSectionIsMissingOrEmpty));
+      // assert
+      exception.CorrespondingType.Should().Be<NotInstantiationClass>();
+      exception.InnerException.Should().NotBeNull("Runtime exception was catched.");
+    }
+
+    [Fact]
+    public void
+      By_Throwing_ConfigurationSectionIsMissingOrEmpty_When_Section_With_Given_Key_Does_Not_Exist()
+    {
+      // arrange
+      const string expectedNotExistingSectionKey = "NonExistingSectionKey";
+      // act
+      var exception = Assert.Throws<SectionIsMissingOrEmpty>(
+        () =>
+          new ServiceCollection().AddBoundToConfig<NotInstantiationClass>(
+            EmptyConfiguration,
+            expectedNotExistingSectionKey));
+      // assert
+      Assert.Equal(expectedNotExistingSectionKey, exception.Key);
+      exception.CorrespondingType.Should().Be<NotInstantiationClass>();
+    }
+
+    public class NotInstantiationClass
+    {
+      public NotInstantiationClass(int i)
+      {
+      }
+    }
+  }
+}

src/BindToConfig.UnitTests/AddBoundToConfig/AddBoundToConfig_Registers_Class_So_That.cs

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+using System;
+using System.Collections.Generic;
+using System.Threading;
+using FluentAssertions;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Xunit;
+
+namespace BindToConfig.UnitTests.AddBoundToConfig
+{
+  public class AddBoundToConfig_Registers_Class_So_That
+  {
+    private const string AnyKey = "_";
+    private static readonly IConfiguration EmptyConfiguration = new ConfigurationBuilder().Build();
+    private readonly IServiceCollection _serviceCollection = new ServiceCollection();
+
+    [Fact]
+    public void When_Configuration_Has_Been_Changed_A_New_Object_Is_Returned_For_A_New_Scope()
+    {
+      // arrange
+      var expected = new SampleConfiguration(1001, Guid.NewGuid().ToString());
+      var configurationProvider = new TesTConfigClassProvider().SetSection(100, "any");
+      var configuration = new ConfigurationRoot(new List<IConfigurationProvider> {configurationProvider});
+      _serviceCollection.AddBoundToConfig<SampleConfiguration>(configuration, nameof(SampleConfiguration));
+      var provider = _serviceCollection.BuildServiceProvider(true);
+      var myOptions1 = provider.CreateScope().ServiceProvider.GetRequiredService<SampleConfiguration>();
+      // act
+      configurationProvider.SetSection(expected.IntValue, expected.StringValue);
+      configurationProvider.Reload();
+      // assert
+      var myOptions2 = provider.CreateScope().ServiceProvider.GetRequiredService<SampleConfiguration>();
+      Assert.NotSame(myOptions1, myOptions2);
+      myOptions2.Should().BeEquivalentTo(expected);
+    }
+
+    [Fact]
+    public void When_Configuration_Has_Been_Changed_And_Causes_Instatnion_Errors_Registered_Handler_Is_Called()
+    {
+      // arrange
+      var configurationProvider = new TesTConfigClassProvider().SetSection(100, "any");
+      var configuration = new ConfigurationRoot(new List<IConfigurationProvider> {configurationProvider});
+      var resetEvent = new ManualResetEventSlim(false);
+      _serviceCollection.AddBoundToConfig<SampleConfiguration>(
+        configuration,
+        nameof(SampleConfiguration),
+        (ex, type) => { resetEvent.Set(); });
+      var provider = _serviceCollection.BuildServiceProvider(true);
+      // act
+      configurationProvider.Clear();
+      configurationProvider.Reload();
+      provider.CreateScope().ServiceProvider.GetRequiredService<SampleConfiguration>();
+      // assert
+      resetEvent.Wait(TimeSpan.FromMilliseconds(1000)).Should().BeTrue("Error handler should be called.");
+    }
+
+    [Fact]
+    public void
+      When_Configuration_Has_Been_Changed_And_Now_Causes_Instatnion_Errors_The_Last_Object_Is_Returned_For_A_New_Scope()
+    {
+      // arrange
+      var configurationProvider = new TesTConfigClassProvider().SetSection(100, "any");
+      var configuration = new ConfigurationRoot(new List<IConfigurationProvider> {configurationProvider});
+      _serviceCollection.AddBoundToConfig<SampleConfiguration>(configuration, nameof(SampleConfiguration));
+      var provider = _serviceCollection.BuildServiceProvider(true);
+      var myOptions1 = provider.CreateScope().ServiceProvider.GetRequiredService<SampleConfiguration>();
+      // act
+      configurationProvider.Clear();
+      configurationProvider.Reload();
+      var myOptions2 = provider.CreateScope().ServiceProvider.GetRequiredService<SampleConfiguration>();
+      // assert
+      Assert.Same(myOptions1, myOptions2);
+    }
+
+    [Fact]
+    public void
+      When_Configuration_Has_Been_Changed_It_Does_Not_Affect_Existing_Scope_And_The_Same_Object_Is_Always_Returned_For_The_Same_Scope()
+    {
+      // arrange
+      var configurationProvider = new TesTConfigClassProvider();
+      var configuration = new ConfigurationRoot(new List<IConfigurationProvider> {configurationProvider});
+      _serviceCollection.AddBoundToConfig<SampleConfiguration>(
+        configuration,
+        AnyKey,
+        BindOptions.DontThrowIfSectionIsMissingOrEmpty);
+      var provider = _serviceCollection.BuildServiceProvider(true);
+      var myOptions1 = provider.CreateScope().ServiceProvider.GetRequiredService<SampleConfiguration>();
+      // act
+      configurationProvider.Reload();
+      // assert
+      var myOptions2 = provider.CreateScope().ServiceProvider.GetRequiredService<SampleConfiguration>();
+      Assert.NotSame(myOptions1, myOptions2);
+    }
+
+    [Fact]
+    public void
+      When_Configuration_Has_Not_Been_Changed_The_Same_Object_Is_Always_Returned_For_The_Same_Scope()
+    {
+      // act
+      _serviceCollection.AddBoundToConfig<SampleConfiguration>(
+        EmptyConfiguration,
+        AnyKey,
+        BindOptions.DontThrowIfSectionIsMissingOrEmpty);
+      // assert
+      var provider = _serviceCollection.BuildServiceProvider(true).CreateScope().ServiceProvider;
+      var myOptions1 = provider.GetRequiredService<SampleConfiguration>();
+      var myOptions2 = provider.GetRequiredService<SampleConfiguration>();
+      Assert.Same(myOptions1, myOptions2);
+    }
+
+    [Fact]
+    public void
+      When_Configuration_Has_Not_Been_Changed_The_Same_Object_Is_Returned_For_Each_New_Scope()
+    {
+      // act
+      _serviceCollection.AddBoundToConfig<SampleConfiguration>(
+        EmptyConfiguration,
+        AnyKey,
+        BindOptions.DontThrowIfSectionIsMissingOrEmpty);
+      var provider = _serviceCollection.BuildServiceProvider(true);
+      Func<SampleConfiguration> GetObjectFromNewScope = () =>
+        provider.CreateScope().ServiceProvider.GetRequiredService<SampleConfiguration>();
+      var expected = GetObjectFromNewScope();
+      var list = new List<SampleConfiguration>();
+      // act
+      for (var i = 0; i < 10; i++)
+      {
+        list.Add(GetObjectFromNewScope());
+      }
+
+      // assert
+      list.TrueForAll(x => ReferenceEquals(expected, x)).Should().BeTrue();
+    }
+  }
+}