Changed GetParser<T> signature

Author: ajgorhoe

src/IGLib.Core/Console/Validation/Implementations/StringParsing/ParsableStringValidator.cs

@@ -9,24 +9,30 @@ namespace IGLib
 
     public class ParsableStringValidator<TTarget> : IValidator<string>
     {
-        private static readonly IStringParser<TTarget> Parser = StringParserProvider.GetParser<TTarget>();
+        private readonly IStringParser<TTarget> _parser;
 
-        public ParsableStringValidator(string? errorMessage = null)
+        public ParsableStringValidator(
+            IFormatProvider? formatProvider = null,
+            string? errorMessage = null)
         {
+            _parser = StringParserProvider.GetParser<TTarget>(formatProvider);
             ErrorMessage = errorMessage ?? $"Value is not a valid {typeof(TTarget).Name}.";
         }
 
         public string ErrorMessage { get; }
 
-        public void Validate(string value, ValidationResults results)
+        public virtual void Validate(string value, ValidationResults results)
         {
-            // ArgumentNullException.ThrowIfNull(results);
-            if (results == null)
-            { throw new ArgumentNullException(nameof(results), "Object to store validation results may not be null."); }
+            // ToDo ArgumentNullException.ThrowIfNull(results);
 
-            if (value is null || !Parser.TryParse(value, out _))
+            if (value == null)
+            {
+                results.AddError(ErrorMessage);
+                return;
+            }
+
+            if (!_parser.TryParse(value, out _))
                 results.AddError(ErrorMessage);
         }
     }
-
 }

src/IGLib.Core/Console/Validation/Implementations/StringParsing/StringParserProvider.cs

@@ -11,14 +11,13 @@ namespace IGLib
     public static class StringParserProvider
     {
 
-        public static IStringParser<T> GetParser<T>()
+        public static IStringParser<T> GetParser<T>(IFormatProvider? formatProvider = null)
         {
             Type type = typeof(T);
 
 
 
             throw new NotSupportedException($"Type {type.FullName} is not supported.");
-
         }