var stringA = string.Join("&", param1.Where(x => !string.IsNullOrEmpty(x.Value)).Select(x => x.Key + "=" + x.Value).ToArray());

var stringA = string.Join("&", param1.Where(x => !string.IsNullOrEmpty(x.Value)).Select(x => x.Key + "=" + x.Value).ToArray());

var stringA = string.Join("&", param1.Where(x => !string.IsNullOrEmpty(x.Value)).Select(x => x.Key + "=" + x.Value).ToArray());

【推广】免费学中医，健康全家人

原文地址：https://www.cnblogs.com/linmilove/p/13405321.html