Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data/System/Data/Common/NameValuePair.cs

@@ -0,0 +1,63 @@
+//------------------------------------------------------------------------------
+// <copyright file="NameValuePair.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+// <owner current="true" primary="true">[....]</owner>
+// <owner current="true" primary="false">[....]</owner>
+//------------------------------------------------------------------------------
+
+namespace System.Data.Common {
+
+    using System;
+    using System.Data.Common;
+    using System.Diagnostics;
+    using System.Runtime.Serialization;
+
+    [Serializable] // MDAC 83147
+    sealed internal class NameValuePair {
+        readonly private string _name;
+        readonly private string _value;
+        [OptionalField(VersionAdded=2)]
+        readonly private int _length;
+        private NameValuePair _next;
+
+        internal NameValuePair(string name, string value, int length) {
+            System.Diagnostics.Debug.Assert(!ADP.IsEmpty(name), "empty keyname");
+            _name = name;
+            _value = value;
+            _length = length;
+        }
+
+        internal int Length {
+            get {
+                // this property won't exist when deserialized from Everett to Whidbey
+                // it shouldn't matter for DbConnectionString/DbDataPermission
+                // which should only use Length during construction
+                // not deserialization or post-ctor runtime
+                Debug.Assert(0 < _length, "NameValuePair zero Length usage");
+                return _length;
+            }
+        }
+        internal string Name {
+            get {
+                return _name;
+            }
+        }
+        internal NameValuePair Next {
+            get {
+                return _next;
+            }
+            set {
+                if ((null != _next) || (null == value)) {
+                    throw ADP.InternalError(ADP.InternalErrorCode.NameValuePairNext);
+                }
+                _next = value;
+            }
+        }
+        internal string Value {
+            get {
+                return _value;
+            }
+        }
+    }
+}