WPF 手撸插件一

1、本文主要使不适用第三方工具，纯手工的WPF主项目加载另一个WPF的项目，这里我们加载的是*.exe。

2、项目结构如下图。AbstractionLayer用于创建插件的接口。WPFIPluginDemo是主程序。WpfPlugin3是要加载的插件程序。

3、 AbstractionLayer中添加接口IPlugin。接口内容如下。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace AbstractionLayer
{public interface IPlugin{void Initialize();}
}

4、WPFIPluginDemo项目中MainWindow.xaml代码如下。

<Window x:Class="WPFIPluginDemo.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:WPFIPluginDemo"mc:Ignorable="d"Title="MainWindow" Height="450" Width="800"><StackPanel><Button x:Name="btnSearchPlugins" Content="搜索插件" Click="BtnSearchPlugins_OnClick"/><Button x:Name="btnShowPlugin" Content="显示插件" Click="BtnShowPlugin_OnClick" Margin="0,10,0,0"/></StackPanel>
</Window>

MainWindow.xaml.cs代码如下。

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using AbstractionLayer;
using Path = System.IO.Path;namespace WPFIPluginDemo
{/// <summary>/// MainWindow.xaml 的交互逻辑/// </summary>public partial class MainWindow : Window{public MainWindow(){InitializeComponent();}private void BtnSearchPlugins_OnClick(object sender, RoutedEventArgs e){LoadPlugins(GetCurrentProgramPath()+"\\Plugins");}public static string GetCurrentProgramPath(){// 获取当前执行的程序集var assembly = Assembly.GetEntryAssembly();// 获取程序集所在的路径var assemblyLocation = assembly.Location;// 获取程序集所在的目录var programPath = Path.GetDirectoryName(assemblyLocation);return programPath;}public List<IPlugin> ListIPlugins = new List<IPlugin>();public void LoadPlugins(string pluginDirectory){try{// 获取所有插件DLLvar pluginDlls = Directory.GetFiles(pluginDirectory, "*.exe", SearchOption.TopDirectoryOnly);foreach (var dll in pluginDlls){Assembly pluginAssembly = Assembly.LoadFrom(dll);// 查找实现了IPlugin接口的类型var pluginTypes = pluginAssembly.GetTypes().Where(t => typeof(IPlugin).IsAssignableFrom(t) && !t.IsInterface);foreach (var pluginType in pluginTypes){IPlugin plugin = (IPlugin)Activator.CreateInstance(pluginType);plugin.Initialize();// 管理插件的代码ListIPlugins.Add(plugin);}}}catch (Exception e){Console.WriteLine(e);throw;}}private void BtnShowPlugin_OnClick(object sender, RoutedEventArgs e){Type plugin = ListIPlugins[0].GetType();MethodInfo showInfo = plugin.GetMethod("Show");//得到dll或exe文件的中的方法showInfo.Invoke(ListIPlugins[0], null);//方法调用}}
}

5、WpfPlugin3项目中创建WpfPlugin.cs。代码如下。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using AbstractionLayer;namespace WpfPlugin3
{public class WpfPlugin : IPlugin{public MainWindow _MainWindow = null;public void Initialize(){_MainWindow = new MainWindow();}public void Show(){if (_MainWindow!=null){_MainWindow.ShowDialog();}}}
}

MainWindow.xaml代码如下。

<Window x:Class="WpfPlugin3.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:WpfPlugin3"mc:Ignorable="d"Title="MainWindow" Height="450" Width="800" WindowStyle="None"><Grid><Button Content="WpfPlugin3" Width="200" Height="200"></Button></Grid>
</Window>

6、在WPFIPluginDemo的Debug目录下创建文件夹Plugins，将WpfPlugin3.exe复制到此文件夹下。如下图。