private static void SingletonAndTransient()
{
Console.WriteLine(nameof(SingletonAndTransient));
ServiceProvider RegisterServices()
{
IServiceCollection services = new ServiceCollection();
services.AddSingleton <IServiceA, ServiceA>();
services.AddTransient <IServiceB, ServiceB>();
// services.AddSingleton<ControllerX>();
services.Add(new ServiceDescriptor(typeof(ControllerX), typeof(ControllerX), ServiceLifetime.Transient));
services.AddSingleton <INumberService, NumberService>();
return(services.BuildServiceProvider());
}
using (ServiceProvider container = RegisterServices())
{
Console.WriteLine($"requesting {nameof(ControllerX)}");
ControllerX x = container.GetRequiredService <ControllerX>();
x.M();
x.M();
Console.WriteLine($"requesting {nameof(ControllerX)}");
ControllerX x2 = container.GetRequiredService <ControllerX>();
x2.M();
Console.WriteLine();
}
}
private static void SingletonAndTransient()
{
Console.WriteLine(nameof(SingletonAndTransient));
//局部方法，注册服务A，服务B，NumberService和控制器类ContorllerX
ServiceProvider RegisterServices()
{
IServiceCollection services = new ServiceCollection();
services.AddSingleton <IServiceA, ServiceA>(); //注册为临时服务
services.AddTransient <IServiceB, ServiceB>(); //注册为单例服务
// services.AddSingleton<ControllerX>();//单例服务
//注册为临时服务
services.Add(new ServiceDescriptor(typeof(ControllerX), typeof(ControllerX), ServiceLifetime.Transient));
services.AddSingleton <INumberService, NumberService>();//注册为单例服务
//创建容器服务器
return(services.BuildServiceProvider());
}
//使用单例临时服务
using (ServiceProvider container = RegisterServices())
{
//第一次请求创建ControllerX
Console.WriteLine($"requesting {nameof(ControllerX)}");
//创建ControllerX对象
ControllerX x = container.GetRequiredService <ControllerX>();
//连续调用2次M（）
x.M();
x.M();
//第二次请求创建ControllerX
Console.WriteLine($"requesting {nameof(ControllerX)}");
ControllerX x2 = container.GetRequiredService <ControllerX>();
x2.M();
Console.WriteLine();
}
}