public T ParseAndValidate <T>(string question, TryParse <T> convert, string error, Func <T, bool> isValid)
{
if (isValid is null)
{
throw new ArgumentNullException(nameof(isValid));
}
return(ParseAndValidate(question, convert, error, v => isValid(v) ? TryResult <T> .Succeed(v) : error));
}
private TryResult ValidateStartIndex(IReadOnlyList <string> pattern)
{
if (pattern.Count < 1)
{
return("Sequence must contain at least one element");
}
if (!int.TryParse(pattern[0], out var startIndex) || startIndex != 1)
{
return("Sequence must start with the number 1");
}
return(TryResult.Succeed());
}
