Parameters
- width
- Width of a thumbnail image.
- height
- Height of a thumbnail image.
Return Value
Indicates whether the cache contains a thumbnail image of specified size.
Target Platforms: .NET 7; .NET 6; .NET 5; .NET Core 3.1; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5