Parsing query options using query option parser

ODataQueryOptionParserParsingQueryOptions.cs

Dictionary<string, string> options = new Dictionary<string, string>()
{
    {"$select"  , "ID"                          },
    {"$expand"  , "ProductDetail"               },
    {"$filter"  , "Categories/any(d:d/ID gt 1)" },
    {"$orderby" , "ID desc"                     },
    {"$top"     , "1"                           },
    {"$count"   , "true"                        },
    {"$search"  , "tom"                         },
};

IEdmType type = model.FindDeclaredType("ODataDemo.Product");
IEdmNavigationSource source = model.FindDeclaredEntitySet("Products");
ODataQueryOptionParser parser 
    = new ODataQueryOptionParser(model, type, source, options);
SelectExpandClause selectExpand = 
    parser.ParseSelectAndExpand();              //parse $select, $expand
FilterClause filter = parser.ParseFilter();     // parse $filter
OrderByClause orderby = parser.ParseOrderBy();  // parse $orderby
SearchClause search = parser.ParseSearch();     // parse $search
long? top = parser.ParseTop();                  // parse $top
long? skip = parser.ParseSkip();                // parse $skip (null)
bool? count = parser.ParseCount();              // parse $count