Add individual compilation tests for each config binding overload

src/libraries/Microsoft.Extensions.Configuration.Binder/gen/ConfigurationBindingGenerator.Emitter.cs

@@ -176,7 +176,7 @@ private void EmitGetValueMethods()
                 if (_generationSpec.ShouldEmitMethods(BinderMethodSpecifier.GetValue_TypeOf_key_defaultValue))
                 {
                     EmitBlankLineIfRequired();
-                    _writer.WriteLine($"public static object? {Identifier.GetValue}(this {FullyQualifiedDisplayName.IConfiguration} {Identifier.configuration}, {FullyQualifiedDisplayName.Type} {Identifier.type}, string {Identifier.key}, object? {Identifier.defaultValue}) =>" +
+                    _writer.WriteLine($"public static object? {Identifier.GetValue}(this {FullyQualifiedDisplayName.IConfiguration} {Identifier.configuration}, {FullyQualifiedDisplayName.Type} {Identifier.type}, string {Identifier.key}, object? {Identifier.defaultValue}) => " +
                         $"{expressionForGetValueCore}({Identifier.configuration}, {Identifier.type}, {Identifier.key}) ?? {Identifier.defaultValue};");
                 }
             }
@@ -527,7 +527,7 @@ private void EmitHelperMethods()
                     _precedingBlockExists = true;
                 }
 
-                if (_generationSpec.ShouldEmitMethods(BinderMethodSpecifier.RootMethodsWithConfigOptions))
+                if (_generationSpec.ShouldEmitMethods(BinderMethodSpecifier.MethodsThatAssessBinderOptions))
                 {
                     _writer.WriteBlankLine();
                     EmitGetBinderOptionsHelper();

src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Model/BinderMethodSpecifier.cs

@@ -80,6 +80,7 @@ internal enum BinderMethodSpecifier
         Bind = Bind_instance | Bind_instance_BinderOptions | Bind_key_instance,
         Get = Get_T | Get_T_BinderOptions | Get_TypeOf | Get_TypeOf_BinderOptions,
         GetValue = GetValue_T_key | GetValue_T_key_defaultValue | GetValue_TypeOf_key | GetValue_TypeOf_key_defaultValue,
-        RootMethodsWithConfigOptions = Bind_instance_BinderOptions | Get_T_BinderOptions | Get_TypeOf_BinderOptions,
+
+        MethodsThatAssessBinderOptions = Bind_instance_BinderOptions | Get
     }
 }

src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/Bind_Instance.generated.txt

@@ -0,0 +1,180 @@
+// <auto-generated/>
+#nullable enable
+
+internal static class GeneratedConfigurationBinder
+{
+    public static void Bind(this global::Microsoft.Extensions.Configuration.IConfiguration configuration, global::Program.MyClass obj) => global::Microsoft.Extensions.Configuration.Binder.SourceGeneration.Helpers.BindCore(configuration, ref obj, binderOptions: null);
+}
+
+namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
+{
+    using Microsoft.Extensions.Configuration;
+    using System;
+    using System.Collections.Generic;
+    using System.Globalization;
+
+    internal static class Helpers
+    {
+        public static void BindCore(IConfiguration configuration, ref List<int> obj, BinderOptions? binderOptions)
+        {
+            if (obj is null)
+            {
+                throw new ArgumentNullException(nameof(obj));
+            }
+
+            foreach (IConfigurationSection section in configuration.GetChildren())
+            {
+                int element;
+                if (section.Value is string stringValue0)
+                {
+                    element = ParseInt(stringValue0, () => section.Path);
+                    obj.Add(element);
+                }
+            }
+        }
+
+        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> obj, BinderOptions? binderOptions)
+        {
+            if (obj is null)
+            {
+                throw new ArgumentNullException(nameof(obj));
+            }
+
+            foreach (IConfigurationSection section in configuration.GetChildren())
+            {
+                string key = section.Key;
+                if (section.Value is string stringValue1)
+                {
+                    obj[key] = stringValue1;
+                }
+            }
+        }
+
+        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 obj, BinderOptions? binderOptions)
+        {
+            if (obj is null)
+            {
+                throw new ArgumentNullException(nameof(obj));
+            }
+
+        }
+
+        public static void BindCore(IConfiguration configuration, ref Dictionary<string, Program.MyClass2> obj, BinderOptions? binderOptions)
+        {
+            if (obj is null)
+            {
+                throw new ArgumentNullException(nameof(obj));
+            }
+
+            foreach (IConfigurationSection section in configuration.GetChildren())
+            {
+                string key = section.Key;
+                if (!(obj.TryGetValue(key, out Program.MyClass2? element) && element is not null))
+                {
+                    element = new Program.MyClass2();
+                }
+                BindCore(section, ref element!, binderOptions);
+                obj[key] = element;
+            }
+        }
+
+        public static void BindCore(IConfiguration configuration, ref Program.MyClass obj, BinderOptions? binderOptions)
+        {
+            if (obj is null)
+            {
+                throw new ArgumentNullException(nameof(obj));
+            }
+
+            List<string>? temp = null;
+            foreach (IConfigurationSection section in configuration.GetChildren())
+            {
+                switch (section.Key)
+                {
+                    case "MyString":
+                    {
+                        if (configuration["MyString"] is string stringValue3)
+                        {
+                            obj.MyString = stringValue3;
+                        }
+                    }
+                    break;
+                    case "MyInt":
+                    {
+                        if (configuration["MyInt"] is string stringValue4)
+                        {
+                            obj.MyInt = ParseInt(stringValue4, () => section.Path);
+                        }
+                    }
+                    break;
+                    case "MyList":
+                    {
+                        if (HasChildren(section))
+                        {
+                            List<int> temp5 = obj.MyList;
+                            temp5 ??= new List<int>();
+                            BindCore(section, ref temp5, binderOptions);
+                            obj.MyList = temp5;
+                        }
+                    }
+                    break;
+                    case "MyDictionary":
+                    {
+                        if (HasChildren(section))
+                        {
+                            Dictionary<string, string> temp6 = obj.MyDictionary;
+                            temp6 ??= new Dictionary<string, string>();
+                            BindCore(section, ref temp6, binderOptions);
+                            obj.MyDictionary = temp6;
+                        }
+                    }
+                    break;
+                    case "MyComplexDictionary":
+                    {
+                        if (HasChildren(section))
+                        {
+                            Dictionary<string, Program.MyClass2> temp7 = obj.MyComplexDictionary;
+                            temp7 ??= new Dictionary<string, Program.MyClass2>();
+                            BindCore(section, ref temp7, binderOptions);
+                            obj.MyComplexDictionary = temp7;
+                        }
+                    }
+                    break;
+                    default:
+                    {
+                        if (binderOptions?.ErrorOnUnknownConfiguration == true)
+                        {
+                            (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        }
+                    }
+                    break;
+                }
+            }
+
+            if (temp is not null)
+            {
+                throw new InvalidOperationException($"'ErrorOnUnknownConfiguration' was set on the provided BinderOptions, but the following properties were not found on the instance of {typeof(Program.MyClass)}: {string.Join(", ", temp)}");
+            }
+        }
+
+        public static bool HasChildren(IConfiguration configuration)
+        {
+            foreach (IConfigurationSection section in configuration.GetChildren())
+            {
+                return true;
+            }
+            return false;
+        }
+
+        public static int ParseInt(string stringValue, Func<string?> getPath)
+        {
+            try
+            {
+                return int.Parse(stringValue, NumberStyles.Integer, CultureInfo.InvariantCulture);
+            }
+            catch (Exception exception)
+            {
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(int)}'.", exception);
+            }
+        }
+    }
+}