Update to 3.5.2 and .net core 2.1

Emby.Server.Implementations/Networking/IPNetwork/IPAddressCollection.cs

@@ -0,0 +1,104 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Numerics;
+
+namespace System.Net
+{
+    public class IPAddressCollection : IEnumerable<IPAddress>, IEnumerator<IPAddress>
+    {
+
+        private IPNetwork _ipnetwork;
+        private BigInteger _enumerator;
+
+        internal IPAddressCollection(IPNetwork ipnetwork)
+        {
+            this._ipnetwork = ipnetwork;
+            this._enumerator = -1;
+        }
+
+
+        #region Count, Array, Enumerator
+
+        public BigInteger Count
+        {
+            get
+            {
+                return this._ipnetwork.Total;
+            }
+        }
+
+        public IPAddress this[BigInteger i]
+        {
+            get
+            {
+                if (i >= this.Count)
+                {
+                    throw new ArgumentOutOfRangeException("i");
+                }
+                byte width = this._ipnetwork.AddressFamily == Sockets.AddressFamily.InterNetwork ? (byte)32 : (byte)128;
+                IPNetworkCollection ipn = this._ipnetwork.Subnet(width);
+                return ipn[i].Network;
+            }
+        }
+
+        #endregion
+
+        #region IEnumerable Members
+
+        IEnumerator<IPAddress> IEnumerable<IPAddress>.GetEnumerator()
+        {
+            return this;
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return this;
+        }
+
+        #region IEnumerator<IPNetwork> Members
+
+        public IPAddress Current
+        {
+            get { return this[this._enumerator]; }
+        }
+
+        #endregion
+
+        #region IDisposable Members
+
+        public void Dispose()
+        {
+            // nothing to dispose
+            return;
+        }
+
+        #endregion
+
+        #region IEnumerator Members
+
+        object IEnumerator.Current
+        {
+            get { return this.Current; }
+        }
+
+        public bool MoveNext()
+        {
+            this._enumerator++;
+            if (this._enumerator >= this.Count)
+            {
+                return false;
+            }
+            return true;
+
+        }
+
+        public void Reset()
+        {
+            this._enumerator = -1;
+        }
+
+        #endregion
+
+        #endregion
+    }
+}