ASP.NETCore服务生命周期

作者：袖梨 2026-09-17

这篇文章介绍了ASP.NETCore中的服务生命周期，文中通过示例代码介绍的非常详细。对大家的学习或工作具有一定的参考借鉴价值，需要的朋友可以参考下

1.前言

在ConfigureServices方法中的容器注册每个应用程序的服务，Asp.Core都可以为每个应用程序提供三种服务生命周期：

Transient（暂时）：每次请求都会创建一个新的实例。这种生命周期最适合轻量级，无状态服务。Scoped（作用域）：在同一个作用域内只初始化一个实例，可以理解为每一个请求只创建一个实例，同一个请求会在一个作用域内。Singleton（单例）：整个应用程序生命周期以内只创建一个实例，后续每个请求都使用相同的实例。如果应用程序需要单例行为，建议让服务容器管理服务的生命周期，而不是在自己的类中实现单例模式。

2.服务生命周期与注册选项案例演示

为了演示生命周期和注册选项之间的差异，请考虑以下接口，将任务表示为具有唯一标识符 OperationId 的操作。根据以下接口配置操作服务的生命周期的方式，容器在类请求时提供相同或不同的服务实例：

public interface IOperation{Guid OperationId { get; }}public interface IOperationTransient : IOperation{}public interface IOperationScoped : IOperation{}public interface IOperationSingleton : IOperation{}public interface IOperationSingletonInstance : IOperation{}

上面四种服务接口在 Operation 类中实现。调用Operation类时将自动生成一个GUID，下面是Operation类的实现：

public class Operation : IOperationTransient, IOperationScoped, IOperationSingleton, IOperationSingletonInstance{public Operation() : this(Guid.NewGuid()){}public Operation(Guid id){OperationId = id;}public Guid OperationId { get; private set; }}

再注册一个OperationService服务实例，当通过依赖关系注入请求 OperationService 实例时，它将接收每个服务的新实例或基于从属服务（Operation）的生命周期的现有实例。OperationService 服务作用就是第二次调用 Operation类，查看Operation类实例的作用域变化。

public class OperationService{public OperationService(IOperationTransient transientOperation,IOperationScoped scopedOperation,IOperationSingleton singletonOperation,IOperationSingletonInstance instanceOperation){_transientOperation = transientOperation;_scopedOperation = scopedOperation;_singletonOperation = singletonOperation;_singletonInstanceOperation = instanceOperation;}public IOperationTransient _transientOperation { get; }public IOperationScoped _scopedOperation { get; }public IOperationSingleton _singletonOperation { get; }public IOperationSingletonInstance _singletonInstanceOperation { get; }}

然后在Startup.ConfigureServices()服务容器中注册各个生命周期的实例：

public void ConfigureServices(IServiceCollection services){services.AddTransient<IOperationTransient, Operation>();services.AddScoped<IOperationScoped, Operation>();services.AddSingleton<IOperationSingleton, Operation>();services.AddSingleton<IOperationSingletonInstance>(new Operation(Guid.Empty));// OperationService depends on each of the other Operation types.services.AddTransient<OperationService, OperationService>();}

再在IndexModel模块里面调用OnGet方法输出，观察IOperation与OperationService类属性OperationId 值的变化：

public class IndexModel : PageModel{public OperationService _operationService { get; }public IOperationTransient _transientOperation { get; }public IOperationScoped _scopedOperation { get; }public IOperationSingleton _singletonOperation { get; }public IOperationSingletonInstance _singletonInstanceOperation { get; }public IndexModel(OperationService operationService,IOperationTransient transientOperation,IOperationScoped scopedOperation,IOperationSingleton singletonOperation,IOperationSingletonInstance singletonInstanceOperation){_operationService = operationService;_transientOperation = transientOperation;_scopedOperation = scopedOperation;_singletonOperation = singletonOperation;_singletonInstanceOperation = singletonInstanceOperation;}public void OnGet(){Console.WriteLine("IOperation操作:");Console.WriteLine("暂时:" + _transientOperation.OperationId.ToString());Console.WriteLine("作用域:" + _scopedOperation.OperationId.ToString());Console.WriteLine("单例:" + _singletonOperation.OperationId.ToString());Console.WriteLine("实例:" + _singletonInstanceOperation.OperationId.ToString());Console.WriteLine("OperationService操作:");Console.WriteLine("暂时:" + _operationService._transientOperation.OperationId.ToString());Console.WriteLine("作用域:" + _operationService._scopedOperation.OperationId.ToString());Console.WriteLine("单例:" + _operationService._singletonOperation.OperationId.ToString());Console.WriteLine("实例:" + _operationService._singletonInstanceOperation.OperationId.ToString());}}

执行IndexModel 类输出结果：

由图总结如下：2.1 Transient（暂时）：每次调用服务的时候都会创建一个新的实例。即在IndexModel类的局部方法或属性中（这里是OnGet方法）实例化一个依赖对象Operation类，伪代码是：

public class IndexModel: PageModel{public void OnGet(){//调用IndexModel类时，实例化了两次Operation类　　　　//第一次OperationService operationService=new OperationService();　　　　　//第二次　　　　　IOperationTransient TransientOperation=new Operation();}}

2.2 Scoped（作用域）：一次请求（Action）内对象实例是相同的，但每次请求会产生一个新实例。相当于在IndexModel类的全局中实例化一次依赖对象Operation类，伪代码是：

OperationService operationService = null;public IndexModel(){operationService = new OperationService();operationService._scopedOperation = new Operation();}public void OnGet(){operationService._scopedOperation.OperationId;IOperationScoped operationScoped = operationService._scopedOperation;operationScoped.OperationId}

2.3 Singleton（单例）：首次请求初始化同一个实例，后续每次请求都使用同一个实例。相当于在整个应用Application中只实例化一次实例，常见的单例模式。

生命周期流程图如下：