LifetimeContext.TryGetExport(CompositionContract, Object) 方法

定义

命名空间:

System.Composition.Hosting.Core

程序集:

System.Composition.Hosting.dll

包:

System.Composition.Hosting v8.0.0

Source:

LifetimeContext.cs

从组合上下文中检索协定实例。

public:
 override bool TryGetExport(System::Composition::Hosting::Core::CompositionContract ^ contract, [Runtime::InteropServices::Out] System::Object ^ % export);

public override bool TryGetExport (System.Composition.Hosting.Core.CompositionContract contract, out object export);

override this.TryGetExport : System.Composition.Hosting.Core.CompositionContract * obj -> bool

Public Overrides Function TryGetExport (contract As CompositionContract, ByRef export As Object) As Boolean

参数

contract

CompositionContract

协定。

export

Object

此方法返回后，会包含协定实例（如果可用）；否则为 null。

返回

Boolean

如果实例已检索，则为 true；否则为 false。

例外

CompositionFailedException

未找到 contract 的导出。