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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.unknownwrapper below:

UnknownWrapper Class (System.Runtime.InteropServices) | Microsoft Learn

UnknownWrapper Class Definition

Caution

UnknownWrapper and support for marshalling to the VARIANT type may be unavailable in future releases.

Wraps objects the marshaler should marshal as a VT_UNKNOWN.

public ref class UnknownWrapper sealed

[System.Obsolete("UnknownWrapper and support for marshalling to the VARIANT type may be unavailable in future releases.")]
public sealed class UnknownWrapper

public sealed class UnknownWrapper

[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public sealed class UnknownWrapper

[<System.Obsolete("UnknownWrapper and support for marshalling to the VARIANT type may be unavailable in future releases.")>]
type UnknownWrapper = class

type UnknownWrapper = class

[<System.Runtime.InteropServices.ComVisible(true)>]
[<System.Serializable>]
type UnknownWrapper = class

Public NotInheritable Class UnknownWrapper

Inheritance

Attributes

Only applies when the managed signature of a method takes an object.

int MyMethod(Object o); //Managed signature  
    HRESULT MyMethod(VARIANT o); //COM signature  
    MyObject o = new MyObject();  
    MyMethod(o); //o gets passed as VARIANT VT_DISPATCH  
    MyMethod(new UnknownWrapper(o)); //o gets passed as VARIANT VT_UNKNOWN

Constructors Properties Methods

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