Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.ServiceModel/System/ServiceModel/Configuration/EncodingConverter.cs

@@ -0,0 +1,69 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace System.ServiceModel.Configuration
+{
+    using System;
+    using System.ComponentModel;
+    using System.ComponentModel.Design.Serialization;
+    using System.Globalization;
+    using System.ServiceModel.Channels;
+    using System.Text;
+
+    class EncodingConverter : TypeConverter
+    {
+        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
+        {
+            if (typeof(string) == sourceType)
+            {
+                return true;
+            }
+            return base.CanConvertFrom(context, sourceType);
+        }
+
+        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
+        {
+            if (typeof(InstanceDescriptor) == destinationType)
+            {
+                return true;
+            }
+            return base.CanConvertTo(context, destinationType);
+        }
+
+        public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
+        {
+            if (value is string)
+            {
+                string encoding = (string)value;
+
+                Encoding retval;
+                if (String.Compare(encoding, TextEncoderDefaults.EncodingString, StringComparison.OrdinalIgnoreCase) == 0)
+                {
+                    // special case for utf-8 to match with what we do in the default text encoding
+                    retval = TextEncoderDefaults.Encoding;
+                }
+                else
+                {
+                    retval = Encoding.GetEncoding(encoding);
+                }
+                if (retval == null)
+                {
+                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument("value", SR.GetString(SR.ConfigInvalidEncodingValue, encoding));
+                }
+                return retval;
+            }
+            return base.ConvertFrom(context, culture, value);
+        }
+
+        public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
+        {
+            if (typeof(string) == destinationType && value is Encoding)
+            {
+                Encoding encoding = (Encoding)value;
+                return encoding.HeaderName;
+            }
+            return base.ConvertTo(context, culture, value, destinationType);
+        }
+    }
+}