System.Dynamic.ExpandoClass.GetValueIndex C# (CSharp) Method

        internal int GetValueIndex(string name, bool caseInsensitive, ExpandoObject obj)
        {
            if (caseInsensitive)
            {
                return GetValueIndexCaseInsensitive(name, obj);
            }
            else
            {
                return GetValueIndexCaseSensitive(name);
            }
        }

            /// <summary>
            /// Gets the class and the index associated with the given name.  Does not update the expando object.  Instead
            /// this returns both the original and desired new class.  A rule is created which includes the test for the
            /// original class, the promotion to the new class, and the set/delete based on the class post-promotion.
            /// </summary>
            private ExpandoClass GetClassEnsureIndex(string name, bool caseInsensitive, ExpandoObject obj, out ExpandoClass klass, out int index)
            {
                ExpandoClass originalClass = Value.Class;

                index = originalClass.GetValueIndex(name, caseInsensitive, obj);
                if (index == ExpandoObject.AmbiguousMatchFound)
                {
                    klass = originalClass;
                    return(null);
                }
                if (index == ExpandoObject.NoMatch)
                {
                    // go ahead and find a new class now...
                    ExpandoClass newClass = originalClass.FindNewClass(name);

                    klass = newClass;
                    index = newClass.GetValueIndexCaseSensitive(name);

                    Debug.Assert(index != ExpandoObject.NoMatch);
                    return(originalClass);
                }
                else
                {
                    klass = originalClass;
                    return(null);
                }
            }