C# · 12月 23, 2021

c# – 每个匹配生命周期范围的实例,默认情况下?

我想在Autofac中为每个匹配的生命周期范围注册创建一个实例,但偶尔需要从全局容器(没有匹配的生命周期范围)请求实例.在没有匹配的生命周期范围的情况下,我想提供一个顶级实例而不是抛出异常.

这可能吗?

解决方法 我认为你最好通过引入新的生命周期选项来扩展Autofac.我使用了Autofac源并对其进行了一些修改: public static class RegistrationBuilderExtensions{ public static IRegistrationBuilder<TLimit,TActivatorData,TRegistrationStyle> InstancePerMatchingOrRootLifetimeScope<TLimit,TRegistrationStyle>(this IRegistrationBuilder<TLimit,TRegistrationStyle> builder,params object[] lifetimeScopeTag) { if (lifetimeScopeTag == null) throw new ArgumentNullException(“lifetimeScopeTag”); builder.RegistrationData.Sharing = InstanceSharing.Shared; builder.RegistrationData.Lifetime = new MatchingScopeOrRootLifetime(lifetimeScopeTag); return builder; }}public class MatchingScopeOrRootLifetime: IComponentLifetime{ readonly object[] _tagsToMatch; public MatchingScopeOrRootLifetime(params object[] lifetimeScopeTagsToMatch) { if (lifetimeScopeTagsToMatch == null) throw new ArgumentNullException(“lifetimeScopeTagsToMatch”); _tagsToMatch = lifetimeScopeTagsToMatch; } public ISharingLifetimeScope FindScope(ISharingLifetimeScope mostNestedVisibleScope) { if (mostNestedVisibleScope == null) throw new ArgumentNullException(“mostNestedVisibleScope”); var next = mostNestedVisibleScope; while (next != null) { if (_tagsToMatch.Contains(next.Tag)) return next; next = next.ParentLifetimeScope; } return mostNestedVisibleScope.RootLifetimeScope; }}

只需将这些类添加到项目中,并将组件注册为:

builder.RegisterType<A>.InstancePerMatchingOrRootLifetimeScope(“TAG”);

我自己没试过,但它应该有用.