ExportProvider.GetExportsCore(ImportDefinition, AtomicComposition) 方法
定义
获取与指定的定义所定义的约束匹配的所有导出。Gets all the exports that match the constraint defined by the specified definition.
protected:
abstract System::Collections::Generic::IEnumerable<System::ComponentModel::Composition::Primitives::Export ^> ^ GetExportsCore(System::ComponentModel::Composition::Primitives::ImportDefinition ^ definition, System::ComponentModel::Composition::Hosting::AtomicComposition ^ atomicComposition);
protected abstract System.Collections.Generic.IEnumerable<System.ComponentModel.Composition.Primitives.Export> GetExportsCore (System.ComponentModel.Composition.Primitives.ImportDefinition definition, System.ComponentModel.Composition.Hosting.AtomicComposition atomicComposition);
protected abstract System.Collections.Generic.IEnumerable<System.ComponentModel.Composition.Primitives.Export>? GetExportsCore (System.ComponentModel.Composition.Primitives.ImportDefinition definition, System.ComponentModel.Composition.Hosting.AtomicComposition? atomicComposition);
abstract member GetExportsCore : System.ComponentModel.Composition.Primitives.ImportDefinition * System.ComponentModel.Composition.Hosting.AtomicComposition -> seq<System.ComponentModel.Composition.Primitives.Export>
Protected MustOverride Function GetExportsCore (definition As ImportDefinition, atomicComposition As AtomicComposition) As IEnumerable(Of Export)
参数
- definition
- ImportDefinition
定义要返回的 Export 对象的条件的对象。The object that defines the conditions of the Export objects to return.
- atomicComposition
- AtomicComposition
组合的事务性容器。The transactional container for the composition.
返回
一个包含与指定的条件匹配的所有导出的集合。A collection that contains all the exports that match the specified condition.
注解
此方法的重写不应将与基数相关的不匹配视为错误,因此在这些情况下不应引发异常。Overrides of this method should not treat cardinality-related mismatches as errors, and should not throw exceptions in those cases. 例如,如果 Cardinality 为, ExactlyOne 并且存在 Export 与指定的条件匹配的零个对象,则 ImportDefinition IEnumerable<T> 应返回一个空集合。For example, if Cardinality is ExactlyOne and there are zero Export objects that match the conditions of the specified ImportDefinition, an empty IEnumerable<T> collection should be returned.