1 files changed, 18 insertions, 0 deletions
diff --git a/src/System.Private.CoreLib/shared/System/Collections/IHashCodeProvider.cs b/src/System.Private.CoreLib/shared/System/Collections/IHashCodeProvider.cs
new file mode 100644
index 000000000..7d6c63f9f
--- /dev/null
+++ b/src/System.Private.CoreLib/shared/System/Collections/IHashCodeProvider.cs
@@ -0,0 +1,18 @@
+// 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.Collections
+{
+    /// <summary>
+    /// Provides a mechanism for a <see cref="Hashtable"/> user to override the default
+    /// GetHashCode() function on Objects, providing their own hash function.
+    /// </summary>
+    [Obsolete("Please use IEqualityComparer instead.")]
+    [System.Runtime.CompilerServices.TypeForwardedFrom("mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
+    public interface IHashCodeProvider
+    {
+        /// <summary>Returns a hash code for the given object.</summary>
+        int GetHashCode(object obj);
+    }
+}