asp.net core mvc (.net5)自带容器生命周期

一.内置容器生命周期

1.瞬时生命周期：每一次getService获取的实例都是不同的实例

IServiceCollection serviceCollection = new ServiceCollection();

// 瞬时生命周期，每一次GetService获取的实例都是不相同的实例
serviceCollection.AddTransient<ITestServiceA, TestServiceA>();

ServiceProvider serviceProvider = serviceCollection.BuildServiceProvider();

ITestServiceA testServiceA = serviceProvider.GetService<ITestServiceA>();
ITestServiceA testServiceA1 = serviceProvider.GetService<ITestServiceA>();

bool isOK = object.ReferenceEquals(testServiceA, testServiceA1);// isOK=false
           

2.单例生命周期，在整个进程中获取的都是同一个实例

IServiceCollection serviceCollection = new ServiceCollection();
// 单例生命周期，整个进程获取的都是同一个的实例
serviceCollection.AddSingleton<ITestServiceA, TestServiceA>();

ServiceProvider serviceProvider = serviceCollection.BuildServiceProvider();

ITestServiceA testServiceA = serviceProvider.GetService<ITestServiceA>();
ITestServiceA testServiceA1 = serviceProvider.GetService<ITestServiceA>();

bool isOK = object.ReferenceEquals(testServiceA, testServiceA1);// isOK=true
           

3.作用域生命周期；同一个作用域，获取的是同一个对象的实例；不同的作用域，获取的是不同的对象实例

IServiceCollection serviceCollection = new ServiceCollection();
// 同一个作用域，获取的是同一个对象实例，不同的作用域获取的是不同的对象实例。
serviceCollection.AddScoped<ITestServiceA, TestServiceA>();

ServiceProvider serviceProvider = serviceCollection.BuildServiceProvider();
ITestServiceA testServiceA = serviceProvider.GetService<ITestServiceA>();
ITestServiceA testServiceA1 = serviceProvider.GetService<ITestServiceA>();

bool isOK = object.ReferenceEquals(testServiceA, testServiceA1);// isOK=true

ServiceProvider serviceProvider1 = serviceCollection.BuildServiceProvider();
ITestServiceA testServiceA2 = serviceProvider1.GetService<ITestServiceA>();

bool isOK1 = object.ReferenceEquals(testServiceA1, testServiceA2);// isOK=false