public MappingCharFilterFactory(Map<String,String> args) {super(args);mapping = get(args, "mapping");if (!args.isEmpty()) {throw new IllegalArgumentException("Unknown parameters: " + args);}}

public MappingCharFilterFactory(IDictionary<string, string> args) : base(args){mapping = Get(args, "mapping");if (args.Count > 0){throw new System.ArgumentException("Unknown parameters: " + args);}}
