我在写一个简单的文件服务器,想要用来做客户端下载器的测试服务器,但是返回的方法提示 ObjectDisposedException: Cannot access a disposed object....Object name: ‘Cannot access a closed file.’...access a disposed object....Object name: 'Cannot access a closed file.'....state) ObjectDisposedException: Cannot access a disposed object.
也就是说不能使用Object作为类名。
System.ObjectDisposedException: Cannot access a disposed object....Object name: 'HouseDbContext'. 估计现在整个人都不好了. 这个撒意思呢? 无法访问被释放的对象。...答案是:IServiceProvider 代码如下: public class NoticeService { private readonly HouseDbContext..._dataContext; private readonly IServiceProvider _serviceProvider; public NoticeService...(HouseDbContext dataContext,IServiceProvider serviceProvider) { _dataContext = dataContext
public class Cat : IServiceProvider, IDisposable { private object GetServiceCore(ServiceRegistry...public class Cat : IServiceProvider, IDisposable { public object GetService(Type serviceType)...public class Cat : IServiceProvider, IDisposable { public void Dispose() { _disposed...; if (constructors.Length == 0) { throw new InvalidOperationException($"Cannot...} else { throw new InvalidOperationException($"Cannot
`类型的属性,返回真正表示容器的一个`IServiceProvider`类型 public interface IServiceScope : IDisposable {...>> _createServiceAccessor; // 此实例是否被销毁 private bool _disposed; // 缓存根据容器获取服务实例的委托, Key为注册类型...) { if (_disposed) ThrowHelper.ThrowObjectDisposedException(); // 添加并获取根据容器对象实例化对象的方法...serviceProviderEngineScope); return realizedService.Invoke(serviceProviderEngineScope); } public void Dispose() { _disposed...= true; Root.Dispose(); } // 实例化的子容器 public IServiceScope CreateScope() { if (_disposed
咱就是通过 IServiceCollection 和 IServiceProvider 来实现的,他们直接被收入到了runtime libraries,在整个.NET平台下通用!...定义了一个方法 GetService,帮助我们通过给定的服务类型,获取其服务实例 public interface IServiceProvider { object?...= false; lock (Sync) { if (_disposed) // 如果scope已经销毁则进入销毁流程 { disposed...try { // Note: This method has already taken lock by the caller for resolution and access...synchronization. // For scoped: takes a dictionary as both a resolution lock and a dictionary access
类型的属性,返回真正表示容器的一个IServiceProvider类型 public interface IServiceScope : IDisposable { /// ...>> _createServiceAccessor; // 此实例是否被销毁 private bool _disposed; // 缓存根据容器获取服务实例的委托, Key为注册类型...) { if (_disposed) ThrowHelper.ThrowObjectDisposedException(); // 添加并获取根据容器对象实例化对象的方法...serviceProviderEngineScope); return realizedService.Invoke(serviceProviderEngineScope); } public void Dispose() { _disposed...= true; Root.Dispose(); } // 实例化的子容器 public IServiceScope CreateScope() { if (_disposed
} is created."); public void Dispose() => Console.WriteLine($"Instance of {GetType().Name} is disposed...public class Cat : IServiceProvider, IDisposable { private object GetServiceCore(ServiceRegistry...public class Cat : IServiceProvider, IDisposable { public object GetService(Type serviceType)...public class Cat : IServiceProvider, IDisposable { public void Dispose() { _disposed...; if (constructors.Length == 0) { throw new InvalidOperationException($"Cannot
我们既可以提供一个Func对象作为工厂来创建对应的服务实例,也可以直接提供一个创建好的服务实例。...public static class ActivatorUtilities { public static object CreateInstance(IServiceProvider provider..., Type instanceType, params object[] parameters); public static T CreateInstance(IServiceProvider...provider, params object[] parameters); public static object GetServiceOrCreateInstance(IServiceProvider...} is created."); public void Dispose() => Console.WriteLine($"Instance of {GetType().Name} is disposed
之前先看一下`ServiceProviderEngineScope`类型,这个类型就可以是一个容器类型,最后实例化的服务对象就缓存在此类之中, 从下面代码中可以看出此类实现了`IServiceScope`和`IServiceProvider...:判断此属性是否已被是否释放 internal class ServiceProviderEngineScope : IServiceScope, IServiceProvider {...private List _disposables; private bool _disposed; } 在此类中还具有两个属性,一个是缓存实例对象的集合和一个*...return Engine.GetService(serviceType, this); } public IServiceProvider ServiceProvider => this...return; _disposed = true; if (_disposables !
public class Base : IDisposable { public Base() => Console.WriteLine($"Instance of {GetType().Name...} is created."); public void Dispose() => Console.WriteLine($"Instance of {GetType().Name} is disposed...builder); GetServices(); GetServices(); Console.WriteLine("\nRoot container is disposed...child.GetService(); Console.WriteLine("\nService scope is disposed...GetServices方法会利用这个IServiceProvider对象创建一个服务范围,并利用此服务范围内的IServiceProvider提供两组服务实例。
GetRequiredService方法的最终实现: public static object GetRequiredService(this IServiceProvider provider, Type...serviceType) { provider.GetService(serviceType); } 由接口IServiceProvider的实现类来获取指定的服务。...internal interface IServiceProviderEngine : IDisposable, IServiceProvider { IServiceScope RootScope...签名如下: public IServiceScope CreateScope() { if (_disposed) { ThrowHelper.ThrowObjectDisposedException...该方法签名如下: internal class ServiceProviderEngineScope : IServiceScope, IServiceProvider { } 最后我们还是调用
. /// /// The ....HttpClient"/> instances will prevent the underlying from being /// disposed...The created scope has the same /// lifetime as the message handler, and will be disposed when...the message handler is disposed. /// /// /// When operations...public override string Name { get => _name; set {
DbContext _dbContext; private readonly IRepositoryFactory _repositoryFactory; private bool _disposed...; public UnitOfWork(IServiceProvider serviceProvider, DbContext context) {...repositoryFactory.GetRepository(this); } public void Dispose() { if (_disposed...Dispose(); _disposed = true; } // 其他略 } Copy /// /// /// <
之前先看一下`ServiceProviderEngineScope`类型,这个类型就可以是一个容器类型,最后实例化的服务对象就缓存在此类之中, 从下面代码中可以看出此类实现了`IServiceScope`和`IServiceProvider...`两个接口,并且此类型拥有两个字段 _disposables:IDisposabl集合,此字段缓存的时所有实现了IDisposable接口的注册服务,以便在释放此容器实例时并将这些服务一起释放 _disposed...(); return Engine.GetService(serviceType, this); } public IServiceProvider ServiceProvider...=> this; public void Dispose() { lock (ResolvedServices) { if (\_disposed)...return; \_disposed = true; if (\_disposables !
public class Base : IDisposable { public Base() => Console.WriteLine($"An instance of {GetType().Name...} is created."); public void Dispose() => Console.WriteLine($"The instance of {GetType().Name} is...disposed."); } public class Foo : Base, IFoo, IDisposable { } public class Bar : Base, IBar, IDisposable...provider.GetService(); provider.GetService(); Console.WriteLine("Child container is disposed...."); } Console.WriteLine("Root container is disposed."); } 由于代表根容器的IServiceProvider对象和服务范围的创建都是在
public class Base : IDisposable { public Base() => Console.WriteLine($"An instance of {GetType().Name...} is created."); public void Dispose() => Console.WriteLine($"The instance of {GetType().Name} is...disposed."); } public class Foo : Base, IFoo, IDisposable { } public class Bar : Base, IBar, IDisposable...provider.GetService(); Console.WriteLine("Child container is disposed...."); } Console.WriteLine("Root container is disposed."); } } } 由于代表根容器的
private bool disposed = false; // Pointer to an external unmanaged resource....="TDelegate"> /// trigger source object....Managed and unmanaged resources // can be disposed. // If disposing equals false, the...Only unmanaged resources can be disposed....disposed = true; } } } /// /// Event manager interface.
the behavior of the run-time object....by calling the GetService method, you must always check to see whether GetService returned a valid object...the design surface is disposed....="Name">Form1 OnValidation 292, 273 PerformFlush
= key; } /// /// Creates an instance of the default cryptographic object... used to perform the RC4 transformation. /// /// The... name of the specific implementation of to create.... /// A cryptographic object.... return m_RNG; } /// /// Holds the RNGCryptoServiceProvider object
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