diff --git a/lib/netstd/Thrift/Collections/TCollections.cs b/lib/netstd/Thrift/Collections/TCollections.cs
new file mode 100644
index 0000000..147bfc7
--- /dev/null
+++ b/lib/netstd/Thrift/Collections/TCollections.cs
@@ -0,0 +1,101 @@
+// Licensed to the Apache Software Foundation(ASF) under one
+// or more contributor license agreements.See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+// 
+//     http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+using System.Collections;
+
+namespace Thrift.Collections
+{
+    // ReSharper disable once InconsistentNaming
+    public class TCollections
+    {
+        /// <summary>
+        ///     This will return true if the two collections are value-wise the same.
+        ///     If the collection contains a collection, the collections will be compared using this method.
+        /// </summary>
+        public static bool Equals(IEnumerable first, IEnumerable second)
+        {
+            if (first == null && second == null)
+            {
+                return true;
+            }
+
+            if (first == null || second == null)
+            {
+                return false;
+            }
+
+            var fiter = first.GetEnumerator();
+            var siter = second.GetEnumerator();
+
+            var fnext = fiter.MoveNext();
+            var snext = siter.MoveNext();
+
+            while (fnext && snext)
+            {
+                var fenum = fiter.Current as IEnumerable;
+                var senum = siter.Current as IEnumerable;
+
+                if (fenum != null && senum != null)
+                {
+                    if (!Equals(fenum, senum))
+                    {
+                        return false;
+                    }
+                }
+                else if (fenum == null ^ senum == null)
+                {
+                    return false;
+                }
+                else if (!Equals(fiter.Current, siter.Current))
+                {
+                    return false;
+                }
+
+                fnext = fiter.MoveNext();
+                snext = siter.MoveNext();
+            }
+
+            return fnext == snext;
+        }
+
+        /// <summary>
+        ///     This returns a hashcode based on the value of the enumerable.
+        /// </summary>
+        public static int GetHashCode(IEnumerable enumerable)
+        {
+            if (enumerable == null)
+            {
+                return 0;
+            }
+
+            var hashcode = 0;
+
+            foreach (var obj in enumerable)
+            {
+                var enum2 = obj as IEnumerable;
+                var objHash = enum2 == null ? obj.GetHashCode() : GetHashCode(enum2);
+
+                unchecked
+                {
+                    hashcode = (hashcode*397) ^ (objHash);
+                }
+            }
+
+            return hashcode;
+        }
+    }
+}
\ No newline at end of file
diff --git a/lib/netstd/Thrift/Collections/THashSet.cs b/lib/netstd/Thrift/Collections/THashSet.cs
new file mode 100644
index 0000000..011f0a0
--- /dev/null
+++ b/lib/netstd/Thrift/Collections/THashSet.cs
@@ -0,0 +1,67 @@
+// Licensed to the Apache Software Foundation(ASF) under one
+// or more contributor license agreements.See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+// 
+//     http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Thrift.Collections
+{
+    // ReSharper disable once InconsistentNaming
+    public class THashSet<T> : ICollection<T>
+    {
+        private readonly HashSet<T> _set = new HashSet<T>();
+
+        public int Count => _set.Count;
+
+        public bool IsReadOnly => false;
+
+        public void Add(T item)
+        {
+            _set.Add(item);
+        }
+
+        public void Clear()
+        {
+            _set.Clear();
+        }
+
+        public bool Contains(T item)
+        {
+            return _set.Contains(item);
+        }
+
+        public void CopyTo(T[] array, int arrayIndex)
+        {
+            _set.CopyTo(array, arrayIndex);
+        }
+
+        public IEnumerator GetEnumerator()
+        {
+            return _set.GetEnumerator();
+        }
+
+        IEnumerator<T> IEnumerable<T>.GetEnumerator()
+        {
+            return ((IEnumerable<T>) _set).GetEnumerator();
+        }
+
+        public bool Remove(T item)
+        {
+            return _set.Remove(item);
+        }
+    }
+}
\ No newline at end of file