Nullable<PreviewSetId> DefaultControlPreview { get; set; }

Property DefaultControlPreview As Nullable(Of PreviewSetId)
	Get
	Set

property Nullable<PreviewSetId> DefaultControlPreview {
	Nullable<PreviewSetId> get ();
	void set (Nullable<PreviewSetId> value);
}

abstract DefaultControlPreview : Nullable<PreviewSetId> with get, set

Property Value

It is possible to assign a default preview type id that is not defined in this collection. This is intentional, in order to allow a preview type defined for the default bilingual file type to be used as the default for the file format without having to explicitly define it in the file type definition.

The id can be passed to FindFromId(PreviewSetId) in order to get the corresponding preview type, or null if the preview type is not defined in this file type definition.

Reference