Dictionary<string, object> paramsMap = new Dictionary<string, object>();

paramsMap["1"] = "值"; 
paramsMap["2"] = "Stephen 公众号"; 
paramsMap["3"] = "StephenJava 微信号"; 
//Contains来判断
if (routeParams.Contains("1")){
   Console.WriteLine("paramsMap 包含key：1 ")
}