1 files changed, 80 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/CharEnumerator.cs b/src/mscorlib/shared/System/CharEnumerator.cs
new file mode 100644
index 0000000000..ea9915a7c4
--- /dev/null
+++ b/src/mscorlib/shared/System/CharEnumerator.cs
@@ -0,0 +1,80 @@
+// 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.
+
+/*============================================================
+**
+**
+**
+** Purpose: Enumerates the characters on a string.  skips range
+**          checks.
+**
+**
+============================================================*/
+
+using System.Collections;
+using System.Collections.Generic;
+
+namespace System
+{
+    public sealed class CharEnumerator : IEnumerator, IEnumerator<char>, IDisposable, ICloneable
+    {
+        private String _str;
+        private int _index;
+        private char _currentElement;
+
+        internal CharEnumerator(String str)
+        {
+            _str = str;
+            _index = -1;
+        }
+
+        public object Clone()
+        {
+            return MemberwiseClone();
+        }
+
+        public bool MoveNext()
+        {
+            if (_index < (_str.Length - 1))
+            {
+                _index++;
+                _currentElement = _str[_index];
+                return true;
+            }
+            else
+                _index = _str.Length;
+            return false;
+        }
+
+        public void Dispose()
+        {
+            if (_str != null)
+                _index = _str.Length;
+            _str = null;
+        }
+
+        Object IEnumerator.Current
+        {
+            get { return Current; }
+        }
+
+        public char Current
+        {
+            get
+            {
+                if (_index == -1)
+                    throw new InvalidOperationException(SR.InvalidOperation_EnumNotStarted);
+                if (_index >= _str.Length)
+                    throw new InvalidOperationException(SR.InvalidOperation_EnumEnded);
+                return _currentElement;
+            }
+        }
+
+        public void Reset()
+        {
+            _currentElement = (char)0;
+            _index = -1;
+        }
+    }
+}