Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.ServiceModel/System/ServiceModel/Channels/EndpointSettings.cs

@@ -0,0 +1,47 @@
+// <copyright>
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+
+namespace System.ServiceModel.Channels
+{
+    using System.Collections.Generic;
+
+    internal static class EndpointSettings
+    {
+        internal const string ValidateOptionalClientCertificates = "wcf:HttpTransport:ValidateOptionalClientCertificates";
+
+        internal static T GetValue<T>(BindingContext context, string name, T defaultValue)
+        {
+            if (context == null ||
+                context.BindingParameters == null ||
+                context.BindingParameters.Count == 0)
+            {
+                return defaultValue;
+            }
+
+            return GetValue<T>(context.BindingParameters, name, defaultValue);
+        }
+
+        internal static T GetValue<T>(BindingParameterCollection bindingParameters, string name, T defaultValue)
+        {
+            if (bindingParameters == null ||
+                bindingParameters.Count == 0)
+            {
+                return defaultValue;
+            }
+
+            IDictionary<string, object> endpointSettings = bindingParameters.Find<IDictionary<string, object>>();
+
+            object setting;
+
+            if (endpointSettings == null ||
+                !endpointSettings.TryGetValue(name, out setting) ||
+                !(setting is T))
+            {
+                return defaultValue;
+            }
+
+            return (T)setting;
+        }
+    }
+}