在WPF中使用.NET Core 3.0依赖项注入和服务提供程序
2021-05-17 23:29
标签:provider iter amp string rom config over tar long
我们都知道.NET Core提供了对依赖项注入的内置支持。我们通常在ASP.NET Core中使用它(从Startup.cs文件中的ConfigureServices方法开始),但是该功能不限于此框架,我们可以在WPF和Windows Forms应用程序中使用它。前言
实践
;
}
新建项目
将所需的NuGet包添加到项目中。
然后,将一个名为appsettings.json的文件添加到项目的根文件夹。将其“ 构建操作”属性设置为“ 内容”,将“复制到输出目录”设置为“ 复制”(如果较新):
{
"AppSettings": {
"AppName": "SampleNetCore3WpfDependencyInjection"
}
}
创建一个AppSettings.cs文件来保存配置设置。该文件将映射我们在appsettings.json中编写的设置:
public class AppSettings
{
public string AppName { get; set; }
}
创建一个示例服务:
public interface ISampleService
{
Taskstring> GetCurrentDate()
public class SampleService : ISampleService
{
public async Taskstring> GetCurrentDate() =>
await Task.FromResult(DateTime.Now.ToLongDateString());
}
然后像往常一样在IOC容器中注册服务:
services.AddScopedISampleService, SampleService>();
打开App.xaml文件并删除Application类的StartupUri属性。然后,我们需要重写App.xaml.cs中的OnStartup方法:
public partial class App : Application
{
public IServiceProvider ServiceProvider { get; private set; }
public IConfiguration Configuration { get; private set; }
protected override void OnStartup(StartupEventArgs e)
{
var builder = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
Configuration = builder.Build();
var serviceCollection = new ServiceCollection();
ConfigureServices(serviceCollection);
ServiceProvider = serviceCollection.BuildServiceProvider();
var mainWindow = ServiceProvider.GetRequiredService();
mainWindow.Show();
}
private void ConfigureServices(IServiceCollection services)
{
services.Configure(Configuration.GetSection(nameof(AppSettings)));
services.AddScoped();
services.AddTransient(typeof(MainWindow));
}
}
MainWindow简单布局及代码改造
如上所述,MainWindow位于IOC容器中。因此,当我们从服务提供商处获得服务时,它将自动注入所有必需的服务(如果有)。:
public partial class MainWindow : Window
{
private readonly ISampleService sampleService;
private readonly AppSettings settings;
public MainWindow(ISampleService sampleService,
IOptions settings)
{
InitializeComponent();
this.sampleService = sampleService;
this.settings = settings.Value;
}
private async void Button_Click(object sender, RoutedEventArgs e)
{
var serviceData =await sampleService.GetCurrentDate();
var settingsData = settings;
TextBox1.Text = $"serviceData:{serviceData}{Environment.NewLine}settingsData:{settings.AppName}";
}
}
Demo地址:github
在WPF中使用.NET Core 3.0依赖项注入和服务提供程序
标签:provider iter amp string rom config over tar long
原文地址:https://www.cnblogs.com/lonelyxmas/p/11763767.html
文章标题:在WPF中使用.NET Core 3.0依赖项注入和服务提供程序
文章链接:http://soscw.com/index.php/essay/86927.html