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GetExportedValueOrDefault(T) Method
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ExportProvider.GetExportedValueOrDefault(T) Method

Gets the exported object with the contract name derived from the specified type parameter or the default value for the specified type, or throws an exception if there is more than one matching exported object.

Namespace:  System.ComponentModel.Composition.Hosting
Assembly:  System.ComponentModel.Composition (in System.ComponentModel.Composition.dll)

member GetExportedValueOrDefault : unit -> 'T 

Type Parameters


The type of the exported object to return. The contract name is also derived from this type parameter.

Return Value

Type: T
The exported object with the contract name derived from T, if found; otherwise, the default value for T.


There is more than one exported object with the contract name derived from T in the CompositionContainer.


The CompositionContainer object has been disposed of.


The underlying exported object cannot be cast to T.


An error occurred during composition. Errors will contain a collection of errors that occurred.

If the exported object is not found, this method returns the appropriate default value for T; for example, zero for integer types, false for Boolean types, and a null reference (Nothing in Visual Basic) for reference types.

The contract name is the result of calling the GetContractName method on T.

The contract name is compared by using the Ordinal property to perform a case-sensitive, non-linguistic comparison.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library
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