DataTable dt = new DataTable();
var age=dt.Compute("avg(age)","");
var height =dt.Compute("avg(height)","");
----
DataTable.AsEnumerable().Average(x =>x.Field<int>(2));//得到平均值 x.Field<int>(2) 里面的2是第几列(age,height的列数)
string[] num = 读取条件设定.Tables["五行农历显示"].AsEnumerable().Select(d => d.Field<string>("日期")).ToArray();/*表中某列转数组*/
C# DataTable怎么合计字段
原文：http://www.cnblogs.com/chxl800/p/6238041.html
