依赖注入的基本使用1/Program.cs

using Microsoft.Extensions.DependencyInjection;

ServiceCollection services = new ServiceCollection();

// AddTransient的两种方式
// services.AddTransient<ITestService,TestServiceImpl>();
// services.AddTransient(typeof(ITestService),typeof(TestServiceImpl));

// AddSingleton的三种方式
// services.AddSingleton<ITestService,TestServiceImpl>();
// services.AddSingleton(typeof(ITestService),new TestServiceImpl());
services.AddSingleton<ITestService>(new TestServiceImpl());

// AddScoped的三种方式
// services.AddScoped<ITestService, TestServiceImpl>();

using (ServiceProvider sp = services.BuildServiceProvider())
{
    var ts1 = sp.GetRequiredService<ITestService>();
    ts1.Name = "Alice";
    ts1.SayHi();
}

依赖注入的基本使用1/TestServiceImpl2.cs

public class TestServiceImpl2 : ITestService
{
    public string Name { get; set; }
    public void SayHi()
    {
        Console.WriteLine($"你好，我是{Name}");
    }
}

依赖注入的基本使用1/TestServiceImpl.cs

public class TestServiceImpl : ITestService
{
    public string Name { get; set; }
    public void SayHi()
    {
        Console.WriteLine($"Hi, I'm {Name}");
    }
}

依赖注入的基本使用1/ITestService.cs

public interface ITestService
{
    public string Name { get; set; }
    public void SayHi();
}