Support multi argument delegates

README.md

@@ -243,7 +243,7 @@ Given the configuration below:
 ```
 
 ```csharp
-public stastic IServiceCollection AddDbConnection(this IServiceCollection services, string connectionString)
+public static IServiceCollection AddDbConnection(this IServiceCollection services, string connectionString)
 ```
 
 The configuration above is equivalent to calling `services.AddDbConnection("abcd");`

sample/SampleOutboxApi/Extensions.cs

@@ -14,15 +14,6 @@ public static TracerProviderBuilder SetDefaultResourceBuilder(this TracerProvide
       return builder.SetResourceBuilder(resourceBuilder);
    }
 
-   public static IBusRegistrationConfigurator UsingActiveMq(this IBusRegistrationConfigurator configurator, Action<IActiveMqBusFactoryConfigurator> configure)
-   {
-      configurator.UsingActiveMq((ctx, cfg) =>
-      {
-         configure?.Invoke(cfg);
-      });
-      return configurator;
-   }
-
    public static IActiveMqBusFactoryConfigurator ConnectionString(this IActiveMqBusFactoryConfigurator configurator, string value, IConfigurationProcessor configurationProcessor)
    {
       var uri = new Uri(configurationProcessor.RootConfiguration.GetConnectionString(value) ?? value);

src/ConfigurationProcessor.Core/Implementation/Extensions.cs

@@ -19,7 +19,7 @@ namespace ConfigurationProcessor.Core.Implementation
 {
    internal static class Extensions
    {
-      public static readonly MethodInfo BindMappableValuesMethod = ReflectionUtil.GetMethodInfo<object>(o => BindMappableValues(default!, default!, default!, default!, default!, default!));
+      public static readonly MethodInfo BindMappableValuesMethod = ReflectionUtil.GetMethodInfo<object>(o => BindMappableValues<object>(default!, default!, default!, default!, default!, default!)).MakeGenericMethod(typeof(object));
       private const string GenericTypePattern = "(?<typename>[a-zA-Z][a-zA-Z0-9\\.]+)<(?<genparam>.+)>";
       private static readonly Regex GenericTypeRegex = new Regex(GenericTypePattern, RegexOptions.Compiled);
       private const char GenericTypeMarker = '`';
@@ -423,9 +423,9 @@ private static TypeResolver ReadGenericType(this ResolutionContext resolutionCon
          }
       }
 
-      public static void BindMappableValues(
+      public static void BindMappableValues<T>(
           this ResolutionContext resolutionContext,
-          object target,
+          T target,
           Type targetType,
           MethodInfo configurationMethod,
           IConfigurationSection sourceConfigurationSection,
@@ -455,7 +455,7 @@ public static void BindMappableValues(
                if (methodInfo.IsStatic)
                {
                   var nargs = arguments.ToList();
-                  nargs.Insert(0, target);
+                  nargs.Insert(0, target!);
                   methodInfo.Invoke(null, nargs.ToArray());
                }
                else
@@ -472,45 +472,98 @@ internal static Delegate GenerateLambda(
          Type argumentType,
          string? originalKey)
       {
-         var typeParameter = Expression.Parameter(argumentType);
-         Expression bodyExpression;
-         if (sourceConfigurationSection?.Exists() == true)
+         if (argumentType.Name.StartsWith("Action`2", StringComparison.Ordinal))
+         {
+            var genArgs = argumentType.GetGenericArguments();
+            var (parameterExpression1, bodyExpression1) = BuildExpressionWithParam(genArgs[0], true);
+            var (parameterExpression2, bodyExpression2) = BuildExpressionWithParam(genArgs[1], true);
+            var combinedArgType = typeof(ValueTuple<,>).MakeGenericType(genArgs);
+            var combinedArg = Expression.New(combinedArgType.GetConstructor(genArgs), parameterExpression1, parameterExpression2);
+            var bodyExpression3 = BuildExpression(combinedArg, combinedArgType, true);
+            var combinedBody = Expression.Block(bodyExpression1, bodyExpression2, bodyExpression3);
+            var lambda = Expression.Lambda(argumentType, combinedBody, parameterExpression1, parameterExpression2).Compile();
+            return lambda;
+         }
+         else if (argumentType.Name.StartsWith("Action`3", StringComparison.Ordinal))
+         {
+            var genArgs = argumentType.GetGenericArguments();
+            var (parameterExpression1, bodyExpression1) = BuildExpressionWithParam(genArgs[0], true);
+            var (parameterExpression2, bodyExpression2) = BuildExpressionWithParam(genArgs[1], true);
+            var (parameterExpression3, bodyExpression3) = BuildExpressionWithParam(genArgs[2], true);
+            var combinedArgType = typeof(ValueTuple<,,>).MakeGenericType(genArgs);
+            var combinedArg = Expression.New(combinedArgType.GetConstructor(genArgs), parameterExpression1, parameterExpression2, parameterExpression3);
+            var bodyExpression4 = BuildExpression(combinedArg, combinedArgType, true);
+            var combinedBody = Expression.Block(bodyExpression1, bodyExpression2, bodyExpression3, bodyExpression4);
+            var lambda = Expression.Lambda(argumentType, combinedBody, parameterExpression1, parameterExpression2, parameterExpression3).Compile();
+            return lambda;
+         }
+         else
          {
-            var methodExpressions = new List<Expression>();
+            var (parameterExpression, bodyExpression) = BuildExpressionWithParam(argumentType);
+
+            var lambda = Expression.Lambda(typeof(Action<>).MakeGenericType(argumentType), bodyExpression, parameterExpression).Compile();
+            return lambda;
+         }
 
-            var childResolutionContext = new ResolutionContext(resolutionContext.AssemblyFinder, resolutionContext.RootConfiguration, sourceConfigurationSection, resolutionContext.AdditionalMethods, resolutionContext.OnExtensionMethodNotFound, argumentType);
+         (ParameterExpression, Expression) BuildExpressionWithParam(Type argumentType, bool handleMissing = false)
+         {
+            var parameterExpression = Expression.Parameter(argumentType);
+            return (parameterExpression, BuildExpression(parameterExpression, argumentType, handleMissing));
+         }
 
-            var keysToExclude = originalKey != null ? new List<string> { originalKey } : new List<string>();
-            if (int.TryParse(sourceConfigurationSection.Key, out _))
+         Expression BuildExpression(Expression parameterExpression, Type argumentType, bool handleMissing = false)
+         {
+            Expression bodyExpression;
+            if (sourceConfigurationSection?.Exists() == true)
             {
-               // integer key indicates that this is from an array
-               keysToExclude.Add("Name");
-            }
+               var methodExpressions = new List<Expression>();
+
+               var childResolutionContext = new ResolutionContext(
+                  resolutionContext.AssemblyFinder,
+                  resolutionContext.RootConfiguration,
+                  sourceConfigurationSection,
+                  resolutionContext.AdditionalMethods,
+                  handleMissing ? e => e.Handled = true : resolutionContext.OnExtensionMethodNotFound,
+                  argumentType);
+
+               var keysToExclude = originalKey != null ? new List<string> { originalKey } : new List<string>();
+               if (int.TryParse(sourceConfigurationSection.Key, out _))
+               {
+                  // integer key indicates that this is from an array
+                  keysToExclude.Add("Name");
+               }
 
-            // we want to return a generic lambda that calls bind c => configuration.Bind(c)
-            Expression<Action<object>> bindExpression = c => sourceConfigurationSection.Bind(c);
-            var bindMethodExpression = (MethodCallExpression)bindExpression.Body;
-            methodExpressions.Add(Expression.Call(bindMethodExpression.Method, bindMethodExpression.Arguments[0], typeParameter));
+               // we want to return a generic lambda that calls bind c => configuration.Bind(c)
+               if (!parameterExpression.Type.IsValueType)
+               {
+                  Expression<Action<object>> bindExpression = c => sourceConfigurationSection.Bind(c);
+                  var bindMethodExpression = (MethodCallExpression)bindExpression.Body;
+                  methodExpressions.Add(Expression.Call(bindMethodExpression.Method, bindMethodExpression.Arguments[0], parameterExpression));
+               }
 
-            methodExpressions.Add(
-               Expression.Call(
-                  BindMappableValuesMethod,
-                  Expression.Constant(childResolutionContext),
-                  typeParameter,
-                  Expression.Constant(argumentType),
-                  Expression.Constant(configurationMethod),
-                  Expression.Constant(sourceConfigurationSection),
-                  Expression.Constant(keysToExclude.ToArray())));
+               var bindMethod = !parameterExpression.Type.IsValueType ?
+                  BindMappableValuesMethod :
+                  ReflectionUtil.GetGenericMethodInfo(() => BindMappableValues<object>(default!, default!, default!, default!, default!, default!)).MakeGenericMethod(parameterExpression.Type);
+
+               methodExpressions.Add(
+                  Expression.Call(
+                     bindMethod,
+                     Expression.Constant(childResolutionContext),
+                     parameterExpression,
+                     Expression.Constant(argumentType),
+                     Expression.Constant(configurationMethod),
+                     Expression.Constant(sourceConfigurationSection),
+                     Expression.Constant(keysToExclude.ToArray())));
+
+               bodyExpression = Expression.Block(methodExpressions);
+            }
+            else
+            {
+               bodyExpression = Expression.Empty();
+            }
 
-            bodyExpression = Expression.Block(methodExpressions);
+            return bodyExpression;
          }
-         else
-         {
-            bodyExpression = Expression.Empty();
-         }
-
-         var lambda = Expression.Lambda(typeof(Action<>).MakeGenericType(argumentType), bodyExpression, typeParameter).Compile();
-         return lambda;
       }
 
       private static object? GetImplicitValueForNotSpecifiedKey(
@@ -845,18 +898,22 @@ private static bool IsConfigurationOptionsBuilder(this ParameterInfo paramInfo,
 
       internal static bool IsConfigurationOptionsBuilder(this Type type, [NotNullWhen(true)] out Type? argumentType)
       {
-         if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Action<>))
-         {
-            argumentType = type.GenericTypeArguments[0];
-
-            // we only accept class types that contain a parameterless public constructor
-            return true;
-         }
-         else
+         if (type.IsGenericType)
          {
-            argumentType = null;
-            return false;
+            if (type.GetGenericTypeDefinition() == typeof(Action<>))
+            {
+               argumentType = type.GenericTypeArguments[0];
+               return true;
+            }
+            else if (type.GetGenericTypeDefinition() == typeof(Action<,>) || type.GetGenericTypeDefinition() == typeof(Action<,,>))
+            {
+               argumentType = type;
+               return true;
+            }
          }
+
+         argumentType = null;
+         return false;
       }
 
       private static bool ParameterTypeHasPropertyMatches(this Type parameterType, IEnumerable<string> suppliedNames)

src/ConfigurationProcessor.Core/Implementation/ReflectionUtil.cs

@@ -32,6 +32,9 @@ private static ModuleBuilder InitializeModuleBuilder()
       public static MethodInfo GetMethodInfo<T>(Expression<Action<T>> methodCallExpression)
           => GetMethodInfo((LambdaExpression)methodCallExpression);
 
+      public static MethodInfo GetGenericMethodInfo(Expression<Action> methodCallExpression)
+         => GetMethodInfo(methodCallExpression);
+
       private static MethodInfo GetMethodInfo(LambdaExpression methodCallExpr)
       {
          var baseExpression = methodCallExpr.Body;

src/Directory.Build.props

@@ -5,7 +5,7 @@
    </PropertyGroup>
 
    <PropertyGroup>
-      <Version>1.7.2</Version>
+      <Version>1.8.0</Version>
       <FileVersion>$(Version).$([System.DateTime]::Now.ToString(yy))$([System.DateTime]::Now.DayOfYear.ToString(000))</FileVersion>
       <PackageVersion>$(Version)</PackageVersion>
       <InformationalVersion>$(FileVersion)-$(GIT_VERSION)</InformationalVersion>
@@ -23,6 +23,8 @@
       <PackageTags>dependencyinjection;configuration;ioc;di;</PackageTags>
       <PackageReadmeFile>README.md</PackageReadmeFile>
       <PackageReleaseNotes>
+v1.8.0
+   - Support Action&lt;T1, T2&gt; and Action&lt;T1, T2, T3&gt; as configuration targets.
 v1.7.2
    - Added special handling for retrieving ConnectionStrings
    - Lambda parameters can now be in any position

tests/ConfigurationProcessor.DependencyInjection.UnitTests/ConfigurationBuilderTestsBase.cs

@@ -1377,6 +1377,49 @@ public void WithObjectNotation_CallExtensionForConnectionString_SetsConnectionSt
          Assert.Equal(expectedConnectionStringValue, option.Value.Name);
       }
 
+      [Fact]
+      public void WithObjectNotiation_MultiParameterDelegate2_SetsValue()
+      {
+         var json = @"
+{
+   'MultiParameterDelegate2': {
+      'ConnectionString' : 'abc',
+      'ConfigureValue': {
+         'Time' : '13:00:10'
+      },
+      'MultiConfigure': 'def'
+   }
+}";
+         var sp = BuildFromJson(json);
+         var option1 = sp.GetService<IOptions<ComplexObject>>();
+         Assert.Equal("abcdef", option1.Value.Name);
+         Assert.Equal(new TimeSpan(13, 0, 10), option1.Value.Value.Time);
+         var option2 = sp.GetService<IOptions<DbConnection>>();
+         Assert.Equal("abcdef", option2.Value.ConnectionString);
+      }
+
+      [Fact]
+      public void WithObjectNotiation_MultiParameterDelegate3_SetsValue()
+      {
+         var json = @"
+{
+   'MultiParameterDelegate3': {
+      'ConnectionString' : 'abc',
+      'ConfigureValue': {
+         'Time' : '13:00:10'
+      },
+      'MultiConfigure': 'def',
+      'Reset2': true
+   }
+}";
+         var sp = BuildFromJson(json);
+         var option1 = sp.GetService<IOptions<ComplexObject>>();
+         Assert.Equal("abcdef", option1.Value.Name);
+         Assert.False(option1.Value.Value.Time.HasValue);
+         var option2 = sp.GetService<IOptions<DbConnection>>();
+         Assert.Equal("abcdef", option2.Value.ConnectionString);
+      }
+
       private IServiceProvider BuildFromJson(string json)
       {
          var serviceCollection = ProcessJson(json);

tests/TestDummies/DummyServiceCollectionExtensions.cs

@@ -5,6 +5,7 @@
 using ConfigurationProcessor;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
@@ -269,7 +270,10 @@ public static void AddConfigureByInterfaceValue(this IComplexObject configuratio
 
       public static void Reset2(this ComplexObject.ChildValue childValue)
       {
-         childValue.Time = null;
+         if (childValue != null)
+         {
+            childValue.Time = null;
+         }
       }
 
       public static void Append<T>(this ComplexObject obj, string value)
@@ -303,5 +307,37 @@ public static void ConnectionString(this ComplexObject obj, string value)
       {
          obj.Name = value;
       }
+
+      public static IServiceCollection MultiParameterDelegate2(this IServiceCollection services, Action<ComplexObject, DbConnection> configurator)
+      {
+         var complexObj = new ComplexObject();
+         var dbConn = new DbConnection();
+         configurator(complexObj, dbConn);
+         services.AddSingleton(Options.Create(complexObj));
+         services.AddSingleton(Options.Create(dbConn));
+         return services;
+      }
+
+      public static IServiceCollection MultiParameterDelegate3(this IServiceCollection services, Action<ComplexObject, ComplexObject.ChildValue, DbConnection> configurator)
+      {
+         var complexObj = new ComplexObject { Value = new ComplexObject.ChildValue() };
+         var dbConn = new DbConnection();
+         configurator(complexObj, complexObj.Value, dbConn);
+         services.AddSingleton(Options.Create(complexObj));
+         services.AddSingleton(Options.Create(dbConn));
+         return services;
+      }
+
+      public static void MultiConfigure(this (ComplexObject Obj, DbConnection Conn) configurator, string value)
+      {
+         configurator.Obj.Name += value;
+         configurator.Conn.ConnectionString += value;
+      }
+
+      public static void MultiConfigure(this (ComplexObject Obj, ComplexObject.ChildValue Child, DbConnection Conn) configurator, string value)
+      {
+         configurator.Obj.Name += value;
+         configurator.Conn.ConnectionString += value;
+      }
    }
 }