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.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto

.gitignore

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+# Visual Studio 2015/2017 cache/options directory
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+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
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+.ionide/

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>

PluginManager.Test/PluginManager.Test.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
+    <PackageReference Include="xunit" Version="2.4.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
+    <PackageReference Include="coverlet.collector" Version="1.2.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\PluginManager\PluginManager.csproj" />
+    <ProjectReference Include="..\TestPlugin\TestPlugin.csproj" />
+  </ItemGroup>
+
+</Project>

PluginManager.Test/PluginManager.cs

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+using System;
+using Xunit;
+using PluginManager.Manager;
+using TestPlugin;
+
+namespace PluginManager.Test
+{
+    public class PDM : PluginDataManager
+    {
+        public override PluginData LoadData(string pluginDataFolder)
+        {
+            return null;
+        }
+
+        public override void SaveData(string yes, PluginData data)
+        {
+            
+        }
+    }
+
+    class PPD : PluginProcessData
+    {
+
+    }
+
+    public class PluginManagerTest
+    {
+        [Fact]
+        public void Test1()
+        {
+            PluginManager<Class1, PDM> pluginManager = new PluginManager<Class1, PDM>();
+            PluginManagerConfig.PluginFolderPath = "Plugins";
+            pluginManager.Load();
+            pluginManager.DoProcessing(new PPD());
+            pluginManager.Unload();
+        }
+    }
+}

PluginManager/Manager/PluginDataManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace PluginManager
+{
+    /// <summary>
+    /// This class implements all the plugin data information handling
+    /// </summary>
+    public abstract class PluginDataManager
+    {
+        public PluginDataManager()
+        {
+            // Need a constructor to use Activator.CreateInstance()
+        }
+
+        /// <summary>
+        /// Loads the data for a specific plugin
+        /// </summary>
+        /// <param name="pluginName">The path to the plugin data file</param>
+        /// <returns>Plugin data object if found, else return null, the plugin must handle this</returns>
+        public abstract PluginData LoadData(string pluginDataFileName);
+
+        /// <summary>
+        /// Saves the data to the plugin data file
+        /// </summary>
+        /// <param name="pluginName">The path to the plugin data file</param>
+        /// <param name="data">Data object to save</param>
+        public abstract void SaveData(string pluginDataFileName, PluginData data);
+    }
+}

PluginManager/Manager/PluginManager.cs

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+using Crayon;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+
+namespace PluginManager.Manager
+{
+    /// <summary>
+    /// Class that handles all plugin handling
+    /// </summary>
+    /// <typeparam name="T">Type of the Plugin that is going to get loaded</typeparam>
+    /// <typeparam name="M">Type of PluginDataManager that is going to get used to load data</typeparam>
+    public class PluginManager<T, M> where T : Plugin where M : PluginDataManager
+    {
+        /// <summary>
+        /// A list of plugins based on their name
+        /// </summary>
+        public List<T> Plugins { get; private set; }
+
+        private int pluginsSize;
+
+        private PluginDataManager dataManager;
+
+        /// <summary>
+        /// Specifies if you are using the plugin system or not
+        /// </summary>
+        public bool Enabled { get; set; }
+
+        public PluginManager()
+        {
+            Plugins = new List<T>();
+            dataManager = (PluginDataManager)Activator.CreateInstance(typeof(M), null);
+            Enabled = true; // By default it's true
+        }
+
+        /// <summary>
+        /// Loads all plugins and their data from the plugin folder
+        /// </summary>
+        public void Load()
+        {
+            if (Enabled)
+            {
+                if (string.IsNullOrEmpty(PluginManagerConfig.PluginFolderPath))
+                    throw new ArgumentNullException("Plugins folder path", "You need to set a path for your plugins folder");
+
+                // First run
+                if (!Directory.Exists(PluginManagerConfig.PluginFolderPath))
+                {
+                    Directory.CreateDirectory(PluginManagerConfig.PluginFolderPath);
+                    return; // Let's return here, no plugins available
+                }
+
+                // Ignores files in this folder
+                var pluginDirectories = Directory.GetDirectories(PluginManagerConfig.PluginFolderPath);
+
+                foreach (var pluginPath in pluginDirectories)
+                {
+                    // Should contain the plugin file
+                    var files = Directory.GetFiles(pluginPath, "*.dll");
+                    foreach (var dll in files)
+                    {
+                        try
+                        {
+                            // We try to load them if they have at least one class that inherits Plugin
+                            var assembly = Assembly.LoadFrom(dll);
+
+                            var types = assembly.GetTypes();
+
+                            foreach (var type in types)
+                            {
+                                if (type.IsSubclassOf(typeof(T)))
+                                    addPlugin(type);
+                            }
+                        }
+                        catch (ReflectionTypeLoadException ex)
+                        {
+                            Console.Error.WriteLine(Output.Red($"Failed to load {Path.GetFileName(dll)}. We will continue to load more assemblies"), ex);
+                        }
+                        catch (Exception ex)
+                        {
+                            Console.Error.WriteLine(Output.Red($"Failed to load {Path.GetFileName(dll)}. We will continue to load more assemblies"), ex);
+                        }
+                    }
+                }
+
+                pluginsSize = Plugins.Count;
+            }
+            else
+            {
+                // Throw here?
+            }
+        }
+
+        /// <summary>
+        /// Saves plugin information to their data files
+        /// </summary>
+        public void Unload()
+        {
+            foreach (var plugin in Plugins)
+            {
+                try
+                {
+                    var dataFilePath = plugin.DataFilePath();
+
+                    // If it's null it means it's not using a file
+                    if (!string.IsNullOrEmpty(dataFilePath))
+                        dataManager.SaveData(dataFilePath, plugin.Data);
+                }
+                catch (Exception)
+                {
+                    Console.Error.WriteLine(Output.Red($"Couldn't save data for {plugin.Name()}"));
+                }
+            }
+        }
+
+        /// <summary>
+        /// Internal function that handles plugin instancing
+        /// </summary>
+        /// <param name="plugin"></param>
+        internal void addPlugin(Type plugin)
+        {
+            Plugin pluginInstance = (T)Activator.CreateInstance(plugin);
+
+            try
+            {
+                Plugins.Add((T)pluginInstance);
+
+                var pluginDataFilePath = pluginInstance.DataFilePath();
+
+                // If it's null we are not using plugin data
+                if (!string.IsNullOrEmpty(PluginManagerConfig.PluginDataFolderPath) && !string.IsNullOrEmpty(pluginDataFilePath))
+                {
+                    var pluginData = dataManager.LoadData(Path.Combine(PluginManagerConfig.PluginDataFolderPath, pluginDataFilePath));
+
+                    // This one shouldn't throw, loadData() will always exist
+                    pluginInstance.loadData(pluginData);
+                }
+
+                Console.WriteLine($"Loaded {pluginInstance.Name()}");
+            }
+            catch (ArgumentException)
+            {
+                Console.Error.WriteLine(Output.Red($"{pluginInstance.Name()} is already loaded"));
+            }
+        }
+
+        /// <summary>
+        /// Executes DoProcessing on all plugins
+        /// </summary>
+        /// <param name="processData"></param>
+        public void DoProcessing(PluginProcessData processData)
+        {
+            for (int i = 0; i < pluginsSize; i++)
+            {
+                Plugins[i].DoProcessing(processData);
+            }
+        }
+    }
+}

PluginManager/Plugin/Plugin.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace PluginManager
+{
+    public delegate void OnLoadedEvent(PluginData data);
+
+    /// <summary>
+    /// Base class to create plugins
+    /// </summary>
+    public abstract class Plugin
+    {
+        /// <summary>
+        /// Event executed when the plugin manager finishes loading this plugin
+        /// </summary>
+        public event OnLoadedEvent OnLoaded;
+
+        /// <summary>
+        /// The plugin data object
+        /// </summary>
+        public PluginData Data { get; private set; }
+
+        public Plugin()
+        {
+            // Need a constructor to use Activator.CreateInstance()
+        }
+
+        /// <summary>
+        /// Internal function that handles data loading
+        /// </summary>
+        /// <param name="data">Data object that is going to get loaded</param>
+        internal void loadData(PluginData data)
+        {
+            if (data == null)
+                BuildDataFile();
+            this.Data = data;
+            OnLoaded?.Invoke(data);
+        }
+
+        /// <summary>
+        /// Builds the default plugin file for when the plugin is first instanciated
+        /// </summary>
+        public abstract void BuildDataFile();
+
+        /// <summary>
+        /// The version of the plugin
+        /// </summary>
+        /// <returns>The version of the plugin</returns>
+        public abstract Version Version();
+
+        /// <summary>
+        /// The version of the plugin
+        /// </summary>
+        /// <returns>The name of the plugin</returns>
+        public abstract string Name();
+
+        /// <summary>
+        /// The path to the plugin data file
+        /// </summary>
+        /// <returns>The path to the plugin data file</returns>
+        public abstract string DataFilePath();
+
+        /// <summary>
+        /// Base function that should get called everytime this plugin needs to process data
+        /// </summary>
+        /// <param name="data"></param>
+        public abstract void DoProcessing(PluginProcessData data);
+    }
+}

PluginManager/Plugin/PluginData.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace PluginManager
+{
+    public abstract class PluginData
+    {
+    }
+}

PluginManager/Plugin/PluginProcessData.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace PluginManager
+{
+    /// <summary>
+    /// Base class for plugin process data that gets passes to Plugin.DoProcessing()
+    /// </summary>
+    public abstract class PluginProcessData
+    {
+    }
+}

PluginManager/PluginConfig.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace PluginManager
+{
+    public static class PluginManagerConfig
+    {
+        public static string PluginDataFolderPath { get; set; }
+        public static string PluginFolderPath { get; set; }
+    }
+}

PluginManager/PluginManager.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Crayon" Version="1.2.48" />
+  </ItemGroup>
+
+</Project>

README.md

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+# PluginManager
+ C# PluginManager

TestPlugin/Class1.cs

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+using PluginManager;
+using System;
+
+namespace TestPlugin
+{
+    public abstract class Class1 : Plugin
+    {
+        public Class1()
+        {
+        }
+    }
+
+    public class asd : Class1
+    {
+        public asd()
+        {
+            base.OnLoaded += Asd_OnLoaded;
+        }
+
+        private void Asd_OnLoaded(PluginData data)
+        {
+            Console.Out.WriteLine("I'm loaded man");
+        }
+
+        public override void DoProcessing(PluginProcessData data)
+        {
+            //Console.WriteLine("working");
+        }
+
+        public override string Name()
+        {
+            return "asd";
+        }
+
+        public override Version Version()
+        {
+            return new Version("1.0.0.0");
+        }
+
+        public override void BuildDataFile()
+        {
+            // Leave this empty if you are not using a data file
+        }
+
+        public override string DataFilePath()
+        {
+            return null;
+        }
+    }
+}

TestPlugin/TestPlugin.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <OutputPath>..\PluginManager.Test\bin\Debug\Plugins\Yep\</OutputPath>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\PluginManager\PluginManager.csproj" />
+  </ItemGroup>
+
+</Project>