C#控制台程序中使用官方依赖注入的实现

/// <summary>
/// 基础服务接口，用来获取一个数字
/// </summary>
public interface IBaseService
{
	/// <summary>
	/// 数字属性
	/// </summary>
	int Number { get; }
	/// <summary>
	/// 获取数字方法
	/// </summary>
	/// <returns>随机数</returns>
	int GetNumber();
}

/// <summary>
/// 计算服务接口，用来求和累加运算
/// </summary>
public interface ICalculateService
{
	/// <summary>
	/// 求和方法
	/// </summary>
	/// <param name="count"></param>
	void Sum(int count);
}

/// <summary>
/// 计算服务
/// </summary>
public class CalculateService : ICalculateService
{
	private readonly IBaseService _baseService;
	public CalculateService(IBaseService baseService)
	{
		_baseService = baseService;
	}
	public void Sum(int n)
	{
		int sum = 0;
		for (int i = 0; i < n; i++)
		{
			sum+= _baseService.Number;
		}
		Console.WriteLine($"the result of ICalculateService is { sum }");
	}
}

/// <summary>
/// 基础服务
/// </summary>
public class BaseService : IBaseService
{
	public int Number { get; }
	public BaseService()
	{
		Number = GetNumber();
		Console.WriteLine($"the Number is {Number}");
	}
	public int GetNumber()
	{
		Random rand = new Random();
		return rand.Next(1, 1000);
	}
}

static void Main(string[] args)
{
	var serviceProvider = new ServiceCollection()
	  .AddTransient<IBaseService, BaseService>()
	  .AddScoped<ICalculateService, CalculateService>()
	  //.AddSingleton<ICalculateService, CalculateService>()
	  //.AddTransient<ICalculateService, CalculateService>()
	  .BuildServiceProvider();

	for (int i = 0; i < 3; i++)
	{
		var calculateService = serviceProvider.GetService<ICalculateService>();
		calculateService.Sum(10);
	}

	var baseService = serviceProvider.GetService<IBaseService>();
	for (int i = 0; i < 3; i++)
	{
		int resultNum = baseService.GetNumber();
		Console.WriteLine($"the result of IBaseService is {resultNum}");
	}
	Console.ReadKey();
}