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

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

Caution

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

Wraps objects the marshaler should marshal as a VT_DISPATCH.

public ref class DispatchWrapper sealed

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

[System.Runtime.Versioning.SupportedOSPlatform("windows")]
public sealed class DispatchWrapper

public sealed class DispatchWrapper

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

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

[<System.Runtime.Versioning.SupportedOSPlatform("windows")>]
type DispatchWrapper = class

type DispatchWrapper = class

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

Public NotInheritable Class DispatchWrapper

Inheritance

Attributes

Use to wrap objects the marshaler should marshal as a VT_DISPATCH. This wrapper will force objects to be marshaled out as VT_DISPATCH. If the object does not support IDispatch then an exception will be thrown.

void MyMethod(Object^ o);

void DoWrap()
{
    Object^ o = gcnew MyObject();
    MyMethod(o);                        // passes o as VT_UNKNOWN
    MyMethod(gcnew DispatchWrapper(o)); // passes o as VT_DISPATCH

    //...
}

void MyMethod(Object o);

public void DoWrap()
{
    Object o = new MyObject();
    MyMethod(o);                      // passes o as VT_UNKNOWN
    MyMethod(new DispatchWrapper(o)); // passes o as VT_DISPATCH

    //...
}

Sub MyMethod(o As Object)
    ' handle object ...
End Sub

Public Sub DoWrap()
    Dim o As Object = new MyObject()
    MyMethod(o)                      ' passes o as VT_UNKNOWN
    MyMethod(new DispatchWrapper(o)) ' passes o as VT_DISPATCH

    '...
End Sub

For more information on VT_DISPATCH, please see the existing documentation for VARENUM::VT_DISPATCH in the MSDN library.

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