堆栈(Stack)就是栈
select OrderSn from ORDER_Tracking group by OrderSn having count(1)>=2
HttpClient httpclient = new HttpClient();
var ret = httpclient.GetAsync("https://www.baidu.com/");
var Content = ret.Result.Content.ReadAsStringAsync().Result;
UTF-8编码的文字可以在各国各种支持UTF-8字符集的浏览器上显示
摘要:
学习这种写法:var Type = new string[] { "aaa", "bbb" }; bool b = ((System.Collections.IList)Type).Contains("ccc"); if (!b) throw new Exception ("不包含xxxx"); v 阅读全文