Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

external/aspnetwebstack/src/System.Web.Mvc/DictionaryValueProvider.cs

@@ -0,0 +1,52 @@
+// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using System.Globalization;
+
+namespace System.Web.Mvc
+{
+    public class DictionaryValueProvider<TValue> : IValueProvider, IEnumerableValueProvider
+    {
+        private readonly Lazy<PrefixContainer> _prefixContainer;
+        private readonly Dictionary<string, ValueProviderResult> _values = new Dictionary<string, ValueProviderResult>(StringComparer.OrdinalIgnoreCase);
+
+        public DictionaryValueProvider(IDictionary<string, TValue> dictionary, CultureInfo culture)
+        {
+            if (dictionary == null)
+            {
+                throw new ArgumentNullException("dictionary");
+            }
+
+            foreach (KeyValuePair<string, TValue> entry in dictionary)
+            {
+                object rawValue = entry.Value;
+                string attemptedValue = Convert.ToString(rawValue, culture);
+                _values[entry.Key] = new ValueProviderResult(rawValue, attemptedValue, culture);
+            }
+
+            _prefixContainer = new Lazy<PrefixContainer>(() => new PrefixContainer(_values.Keys), isThreadSafe: true);
+        }
+
+        public virtual bool ContainsPrefix(string prefix)
+        {
+            return _prefixContainer.Value.ContainsPrefix(prefix);
+        }
+
+        public virtual ValueProviderResult GetValue(string key)
+        {
+            if (key == null)
+            {
+                throw new ArgumentNullException("key");
+            }
+
+            ValueProviderResult valueProviderResult;
+            _values.TryGetValue(key, out valueProviderResult);
+            return valueProviderResult;
+        }
+
+        public virtual IDictionary<string, string> GetKeysFromPrefix(string prefix)
+        {
+            return _prefixContainer.Value.GetKeysFromPrefix(prefix);
+        }
+    }
+}