Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/ModelBinding/DictionaryValueProvider`1.cs

@@ -0,0 +1,47 @@
+namespace System.Web.ModelBinding {
+    using System;
+    using System.Collections.Generic;
+    using System.Globalization;
+
+    public class DictionaryValueProvider<TValue> : IValueProvider {
+
+        private readonly PrefixContainer _prefixes;
+        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");
+            }
+
+            _prefixes = new PrefixContainer(dictionary.Keys);
+            AddValues(dictionary, culture);
+        }
+
+        private void AddValues(IDictionary<string, TValue> dictionary, CultureInfo culture) {
+            foreach (var entry in dictionary) {
+                object rawValue = entry.Value;
+                string attemptedValue = Convert.ToString(rawValue, culture);
+                _values[entry.Key] = new ValueProviderResult(rawValue, attemptedValue, culture);
+            }
+        }
+
+        public virtual bool ContainsPrefix(string prefix) {
+            if (prefix == null) {
+                throw new ArgumentNullException("prefix");
+            }
+
+            return _prefixes.ContainsPrefix(prefix);
+        }
+
+        public virtual ValueProviderResult GetValue(string key) {
+            if (key == null) {
+                throw new ArgumentNullException("key");
+            }
+
+            ValueProviderResult vpResult;
+            _values.TryGetValue(key, out vpResult);
+            return vpResult;
+        }
+
+    }
+}