Creation and initialization of various subtypes without a lot of casting

Question

I am sure that I was busy with a lot of castings and such in this code below. It seems like there should be a smoother path. Basically, I'm trying to use the builder (CreateNewPattern) method to process new objects of a passed subclass type (using the CreateNewCircularPattern and CreateNewLinePattern methods). Currently, I only have two subclasses like CircularHolePattern and SingleLineHolePattern, which are inherited from HolePattern, but I expect more as my application grows.

Is this a place to use delegate or lambda? He does not know anything about them, so please be as specific as possible with the code suggestions.

private CircularHolePattern CreateNewCircularPattern()
{
   var CreatedPattern = CreateNewPattern(typeof(CircularHolePattern));
   return (CircularHolePattern)CreatedPattern;
}


private SingleLineHolePattern CreateNewLinePattern()
{
   var CreatedPattern=CreateNewPattern(typeof(SingleLineHolePattern));
   return (SingleLineHolePattern)CreatedPattern;
}

private HolePattern CreateNewPattern(Type PatternTypeToCreate)
{
    var NewHolePattern = (HolePattern)Activator.CreateInstance(PatternTypeToCreate);
    NewHolePattern.PatternName = "Pattern #" + (HolePatterns.Count + 1).ToString();
    this.AddPattern(NewHolePattern);
    this.SetActivePattern(NewHolePattern);
    return NewHolePattern;
}

Answer 1

, :

private T CreateNewPattern<T>() where T : HolePattern, new()
{
    var newHolePattern = new T();
    newHolePattern.PatternName = "Pattern #" +
        (HolePatterns.Count + 1).ToString();
    this.AddPattern(newHolePattern);
    this.SetActivePattern(newHolePattern);
    return newHolePattern;          
}

private SingleLineHolePattern CreateNewLinePattern() {
    return CreateNewPattern<SingleLineHolePattern>();
}

private CircularHolePattern CreateNewCircularPattern() {
    return CreateNewPattern<CircularHolePattern>();
}

T - generic-type; , . where , " HolePattern , " - new T() HolePattern (, PatternName). , HolePattern .

Answer 2

-, Create... Pattern

private CircularHolePattern CreateNewCircularPattern()
{
   return CreateNewPattern(typeof(CircularHolePattern));
}

, . , HolePattern Create... Pattern , CircularHolePattern. HolePattern.

, CreateNewCircularPattern

private HolePattern CreateNewCircularPattern()
{
   return CreateNewPattern(typeof(CircularHolePattern));
}