C# 拼接SQL中in条件

一、拼接字符串类型的字段

string sql = @"select distinct ziduan from tablename where ziduan in ('{0}')";
sql=string.Format(sql, string.Join("','", list.ToArray()));

二、拼接数字类型的字段

string sql = @"select distinct ziduan from tablename where ziduan in ({0})";
sql=string.Format(sql, string.Join(",", list.ToArray()));

引用连接 （https://www.cnblogs.com/deepalley/p/13373707.html）