1 files changed, 53 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/Runtime/Serialization/StreamingContext.cs b/src/mscorlib/shared/System/Runtime/Serialization/StreamingContext.cs
new file mode 100644
index 0000000000..1026a87d1e
--- /dev/null
+++ b/src/mscorlib/shared/System/Runtime/Serialization/StreamingContext.cs
@@ -0,0 +1,53 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace System.Runtime.Serialization
+{
+    [Serializable]
+    public struct StreamingContext
+    {
+        private readonly object _additionalContext;
+        private readonly StreamingContextStates _state;
+
+        public StreamingContext(StreamingContextStates state) : this(state, null)
+        {
+        }
+
+        public StreamingContext(StreamingContextStates state, object additional)
+        {
+            _state = state;
+            _additionalContext = additional;
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (!(obj is StreamingContext))
+            {
+                return false;
+            }
+            StreamingContext ctx = (StreamingContext)obj;
+            return ctx._additionalContext == _additionalContext && ctx._state == _state;
+        }
+
+        public override int GetHashCode() => (int)_state;
+
+        public StreamingContextStates State => _state;
+
+        public object Context => _additionalContext;
+    }
+
+    [Flags]
+    public enum StreamingContextStates
+    {
+        CrossProcess = 0x01,
+        CrossMachine = 0x02,
+        File = 0x04,
+        Persistence = 0x08,
+        Remoting = 0x10,
+        Other = 0x20,
+        Clone = 0x40,
+        CrossAppDomain = 0x80,
+        All = 0xFF,
+    }
+}