参数代入写法

string uid = "****";
string pwd ="456789";
string mobile = "4567890";
string msg = "34567890-";
var client = new RestClient($"https://submit.10690221.com/send/ordinarykv?uid={uid}&password={pwd}&mobile={mobile}&msg={msg}");

 一开始的写法是

var client = new RestClient("https://submit.10690221.com/send/ordinarykv?uid=****&password=456789&mobile=4567890&msg=34567890-");