如何创建一个扩展方法将字符串得到一笔 创建Sumstring扩展方法创建扩展方法LINQ
List<myclass> obj=new List<myclass>()
{
new myclass(){ID=1,name="ali",number=1},
new myclass(){ID=1,name="karimi",number=2},
new myclass(){ID=2,name="mohammad",number=4},
new myclass(){ID=2,name="sarbandi",number=5},
};
var query = (from p in obj
group p by p.ID into g
select new
{ id = g.Key, sum = g.Sumstring(p => p.name) }).ToList();
dataGridView1.DataSource=query;
我连接到数据库 什么是
字符串的总和是多少?级联? – zneak 2013-04-11 19:01:14
'sumstring'的输入/输出是什么? – 2013-04-11 19:04:09