1 files changed, 48 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/TypeCode.cs b/src/mscorlib/shared/System/TypeCode.cs
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+++ b/src/mscorlib/shared/System/TypeCode.cs
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+// 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.
+
+// The TypeCode enum represents the type code of an object. To obtain the
+// TypeCode for a given object, use the Value.GetTypeCode() method. The
+// TypeCode.Empty value represents a null object reference. The TypeCode.Object
+// value represents an object that doesn't implement the IConvertible interface. The
+// TypeCode.DBNull value represents the database null, which is distinct and
+// different from a null reference. The other type codes represent values that
+// use the given simple type encoding.
+//
+// Note that when an object has a given TypeCode, there is no guarantee that
+// the object is an instance of the corresponding System.XXX value class. For
+// example, an object with the type code TypeCode.Int32 might actually be an
+// instance of a nullable 32-bit integer type (with a value that isn't the
+// database null).
+//
+// There are no type codes for "Missing", "Error", "IDispatch", and "IUnknown".
+// These types of values are instead represented as classes. When the type code
+// of an object is TypeCode.Object, a further instance-of check can be used to
+// determine if the object is one of these values.
+
+namespace System
+{
+    [Serializable]
+    public enum TypeCode
+    {
+        Empty = 0,          // Null reference
+        Object = 1,         // Instance that isn't a value
+        DBNull = 2,         // Database null value
+        Boolean = 3,        // Boolean
+        Char = 4,           // Unicode character
+        SByte = 5,          // Signed 8-bit integer
+        Byte = 6,           // Unsigned 8-bit integer
+        Int16 = 7,          // Signed 16-bit integer
+        UInt16 = 8,         // Unsigned 16-bit integer
+        Int32 = 9,          // Signed 32-bit integer
+        UInt32 = 10,        // Unsigned 32-bit integer
+        Int64 = 11,         // Signed 64-bit integer
+        UInt64 = 12,        // Unsigned 64-bit integer
+        Single = 13,        // IEEE 32-bit float
+        Double = 14,        // IEEE 64-bit double
+        Decimal = 15,       // Decimal
+        DateTime = 16,      // DateTime
+        String = 18,        // Unicode character string
+    }
+}