private IEnumerable<dynamic> CustomQuery(string path)
{
	var rows = MiniExcel.Query(path,true).Cast<IDictionary<string,object>>();
	foreach (var r in rows)
	{
		var empInfo = new EmpInfo();
		if(r.Keys.Contains("工号"))
			empInfo.Empno = r["工号"] as string;
		else if (r.Keys.Contains("人员编号"))
			empInfo.Empno = r["人员编号"] as string;
		yield return empInfo;
	}
}

public class EmpInfo
{
	public string Empno { get; set; }	
}