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IsValid: True IsValid: True IsValid: True IsValid: True 

IsValid: True IsValid: True IsValid: True IsValid: True 

Accepting a Dependency Injection (IValidationStrategy) and using a nested builder class to construct the different stratgy implementations in an immutable way:

Accepting a Dependency Injection (IValidationStrategy) and using a nested builder class to construct the different strategy implementations in an immutable way:

Accepting a Dependency Injection (IValidationStrategy) and using a nested builder class to construct the different implementations in an immutable way:

class Program { static void Main(string[] args) { Console.Out.WriteLine( "IsValid: {0}", new StringValidator.Builder() .Regex(@"\d+") .Validate("55") ); Console.Out.WriteLine( "IsValid: {0}", new StringValidator.Builder() .WildCard("*") .Validate("Whatever string to be validated") ); // Or, if you hate using nameless temporary objects StringValidator.Builder stringValidatorBuilder = new StringValidator.Builder(); string regex = @"\d+"; StringValidator regValidator = stringValidatorBuilder.Regex(regex); bool isValid = regValidator.Validate("55"); Console.Out.WriteLine("IsValid: {0}", isValid); string wildCard = "*"; StringValidator wildCardValidator = stringValidatorBuilder.WildCard(wildCard); isValid = wildCardValidator.Validate("Whatever string to be validated"); Console.Out.WriteLine("IsValid: {0}", isValid); } } 

IsValid: True IsValid: True IsValid: True IsValid: True 

Accepting a Dependency Injection (IValidationStrategy) and using a nested builder class to construct the different stratgy implementations in an immutable way:

class Program { static void Main(string[] args) { Console.Out.WriteLine( "IsValid: {0}", new StringValidator.Builder() .Regex(@"\d+") .Validate("55") ); Console.Out.WriteLine( "IsValid: {0}", new StringValidator.Builder() .WildCard("*") .Validate("Whatever string to be validated") ); // Or, if you hate using nameless temporary objects Console.Out.WriteLine(); StringValidator.Builder stringValidatorBuilder = new StringValidator.Builder(); string regex = @"\d+"; StringValidator regValidator = stringValidatorBuilder.Regex(regex); bool isValid = regValidator.Validate("55"); Console.Out.WriteLine("IsValid: {0}", isValid); string wildCard = "*"; StringValidator wildCardValidator = stringValidatorBuilder.WildCard(wildCard); isValid = wildCardValidator.Validate("Whatever string to be validated"); Console.Out.WriteLine("IsValid: {0}", isValid); } } 

IsValid: True IsValid: True   IsValid: True IsValid: True