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ef core用原始sql查询，不能自动映射到类型中。
处理主要是将sql查询结果转换为json，然后再将json转换为类型对象

      public async Task<List<Warning_log>> GetStatData(){string sql = @"SELECT       CONVERT(date, [trigger_time]) as trigger_time
,count(distinct[warning_txt]) as P
,[warning_target]FROM  [warning_log] 
group by CONVERT(date, [trigger_time]) ,[warning_target] ";var db = GetNewDbContext();var jsonObj = await db.Database.SqlQueryRaw<string>($"{sql}   for json path ").ToListAsync();string json = jsonObj.First().ToString();         var list2 = Newtonsoft.Json.JsonConvert.DeserializeObject<List<Warning_log>>(json);return list2;}

参考资料
https://stackoverflow.com/questions/74876446/error-in-sqlquery-method-is-not-natively-supported-by-your-database-provider