Add migrated to .NET 8.0 variant of Hcs.Client

Hcs.ClientNet/GostCryptography/Asn1/Ber/Asn1Choice.cs

@@ -0,0 +1,52 @@
+using System;
+
+namespace GostCryptography.Asn1.Ber
+{
+    [Serializable]
+    public abstract class Asn1Choice : Asn1Type
+    {
+        [NonSerialized]
+        private int _choiceId;
+
+        [NonSerialized]
+        protected Asn1Type Element;
+
+        public virtual int ChoiceId => _choiceId;
+
+        public abstract string ElemName { get; }
+
+        public virtual Asn1Type GetElement()
+        {
+            return Element;
+        }
+
+        public virtual void SetElement(int choiceId, Asn1Type element)
+        {
+            _choiceId = choiceId;
+
+            Element = element;
+        }
+
+        public override bool Equals(object value)
+        {
+            var choice = value as Asn1Choice;
+
+            if (choice == null)
+            {
+                return false;
+            }
+
+            if (_choiceId != choice._choiceId)
+            {
+                return false;
+            }
+
+            return Element.Equals(choice.Element);
+        }
+
+        public override int GetHashCode()
+        {
+            return Element?.GetHashCode() ?? base.GetHashCode();
+        }
+    }
+}