Added White-/Blacklist Attributes, DateOnly/TimeOnly converters, TcpClientMoq

AMWD.Common.EntityFrameworkCore/Converters/NullableTimeOnlyConverter.cs

@@ -0,0 +1,28 @@
+#if NET6_0_OR_GREATER
+
+using System;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+namespace AMWD.Common.EntityFrameworkCore.Converters
+{
+	/// <summary>
+	/// Defines the conversion from a nullable <see cref="TimeOnly"/> object to a nullable <see cref="TimeSpan"/> which can be handled by the database engine.
+	/// </summary>
+	/// <remarks>
+	/// As of 2022-06-04 only required for Microsoft SQL server on .NET 6.0.
+	/// </remarks>
+	public class NullableTimeOnlyConverter : ValueConverter<TimeOnly?, TimeSpan?>
+	{
+		/// <summary>
+		/// Initializes a new instance of the <see cref="NullableTimeOnlyConverter"/> class.
+		/// </summary>
+		public NullableTimeOnlyConverter()
+			: base(
+				d => d == null ? null : new TimeSpan?(d.Value.ToTimeSpan()),
+				d => d == null ? null : new TimeOnly?(TimeOnly.FromTimeSpan(d.Value))
+			)
+		{ }
+	}
+}
+
+#endif