Support Compact Framework 3.5
diff --git a/src/ProtocolBuffers/GeneratedMessage.cs b/src/ProtocolBuffers/GeneratedMessage.cs
index 1e33674..d60f2b9 100644
--- a/src/ProtocolBuffers/GeneratedMessage.cs
+++ b/src/ProtocolBuffers/GeneratedMessage.cs
@@ -69,8 +69,8 @@
internal IDictionary<FieldDescriptor, Object> GetMutableFieldMap() {
- // Use a SortedDictionary so we'll end up serializing fields in order
- var ret = new SortedDictionary<FieldDescriptor, object>();
+ // Use a SortedList so we'll end up serializing fields in order
+ var ret = new SortedList<FieldDescriptor, object>();
MessageDescriptor descriptor = DescriptorForType;
foreach (FieldDescriptor field in descriptor.Fields) {
IFieldAccessor<TMessage, TBuilder> accessor = InternalFieldAccessors[field];