From e7cebf1563239e9148182c9d6acd385e3d278004 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tommy=20=C3=96man?= <tommy@oeman.se>
Date: Sun, 29 Nov 2020 20:31:07 +0100
Subject: [PATCH] Delegate factory

---
 AutoFacSamles.sln                      |  6 +++
 PatternDemoCore/PatternDemoCore.csproj | 12 ++++++
 PatternDemoCore/Program.cs             | 56 ++++++++++++++++++++++++++
 3 files changed, 74 insertions(+)
 create mode 100644 PatternDemoCore/PatternDemoCore.csproj
 create mode 100644 PatternDemoCore/Program.cs

diff --git a/AutoFacSamles.sln b/AutoFacSamles.sln
index ae22973..ae24021 100644
--- a/AutoFacSamles.sln
+++ b/AutoFacSamles.sln
@@ -5,6 +5,8 @@ VisualStudioVersion = 16.0.30717.126
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AutoFacSamles", "AutoFacSamles\AutoFacSamles.csproj", "{2CFA4809-16F7-4DB9-B4BB-CF60945656E5}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PatternDemoCore", "PatternDemoCore\PatternDemoCore.csproj", "{D8041EF1-F2AC-4A04-A7A5-56E2CB6F249C}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -15,6 +17,10 @@ Global
 		{2CFA4809-16F7-4DB9-B4BB-CF60945656E5}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{2CFA4809-16F7-4DB9-B4BB-CF60945656E5}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{2CFA4809-16F7-4DB9-B4BB-CF60945656E5}.Release|Any CPU.Build.0 = Release|Any CPU
+		{D8041EF1-F2AC-4A04-A7A5-56E2CB6F249C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D8041EF1-F2AC-4A04-A7A5-56E2CB6F249C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D8041EF1-F2AC-4A04-A7A5-56E2CB6F249C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D8041EF1-F2AC-4A04-A7A5-56E2CB6F249C}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/PatternDemoCore/PatternDemoCore.csproj b/PatternDemoCore/PatternDemoCore.csproj
new file mode 100644
index 0000000..d1ec505
--- /dev/null
+++ b/PatternDemoCore/PatternDemoCore.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Autofac" Version="6.0.0" />
+  </ItemGroup>
+
+</Project>
diff --git a/PatternDemoCore/Program.cs b/PatternDemoCore/Program.cs
new file mode 100644
index 0000000..8707079
--- /dev/null
+++ b/PatternDemoCore/Program.cs
@@ -0,0 +1,56 @@
+using Autofac;
+using System;
+
+namespace PatternDemoCore
+{
+
+    public class Service
+    {
+        public string DoSomething(int value)
+        {
+            return $"I have {value}";
+        }
+    }
+
+    public class DomainObject
+    {
+        private readonly Service service;
+        private readonly int value;
+
+        public delegate DomainObject Factory(int value);
+
+        public DomainObject(Service service, int value)
+        {
+            this.service = service;
+            this.value = value;
+        }
+
+        public override string ToString()
+        {
+            return service.DoSomething(value);
+        }
+    }
+
+    public class Demo
+    {
+        static void Main(string[] args)
+        {
+            var cb = new ContainerBuilder();
+            cb.RegisterType<Service>();
+            cb.RegisterType<DomainObject>();
+
+            var container = cb.Build();
+            var dobj = container.Resolve<DomainObject>(
+                new PositionalParameter(1, 42));
+            Console.WriteLine(dobj);
+
+            // Better way
+
+            var factory = container.Resolve<DomainObject.Factory>();
+            var dobj2 = factory(42);
+            Console.WriteLine(dobj2);
+
+
+        }
+    }
+}