protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
switch (value)
{
case string type when CalendarEventTypes.IsKnownType(type):
return(ValidationResult.Success);
case string type:
var validTypes = string.Join(", ", CalendarEventTypes.All);
return(new ValidationResult($"Calendar event type `{type}` is not recognized. Must be one of the ${validTypes}"));
default:
return(new ValidationResult("Type must be string"));
}
}