CompositionHost.TryGetExport(CompositionContract, Object) 方法

定義

命名空間:
System.Composition.Hosting
組件:
System.Composition.Hosting.dll

從組合內容擷取指定的匯出。Retrieves the specified export from the composition context.

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

參數

contract
CompositionContract

要擷取的匯出。The export to retrieve.

export
Object

當此方法傳回時，會包含匯出的執行個體 (如果可用的話)；否則為 null。When this method returns, contains an instance of the export if available; otherwise, null.

傳回

Boolean

如果已擷取匯出則為 true，否則為 false。true if the export was retrieved; otherwise, false.

例外狀況

CompositionFailedException

匯出太多。There are too many exports.

適用於