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Linq查询Listlt;Tgt;无值解决思路

发布时间: 2012-03-14 12:01:12 作者: rapoo

Linq查询List<T>无值
List<Wisesoft.Tool.Log.Model.LoginLogInfo> listLog = new List<Wisesoft.Tool.Log.Model.LoginLogInfo>();

Wisesoft.Tool.Log.Model.LoginLogInfo model = new Wisesoft.Tool.Log.Model.LoginLogInfo();
model.ID = 1;
model.EmpName = "zengk";
listLog.Add(model);

Wisesoft.Tool.Log.Model.LoginLogInfo model2 = new Wisesoft.Tool.Log.Model.LoginLogInfo();
model2.ID = 2;
model2.EmpName = "zengk2";
listLog.Add(model2);


Wisesoft.Tool.Log.Model.LoginLogInfo model3 = new Wisesoft.Tool.Log.Model.LoginLogInfo();
model3.ID = 3;
model3.EmpName = "zengk3";
listLog.Add(model3);

var name = from p in listLog where p.ID == 2 select p.EmpName;

我查询出来的Name一直为空

[解决办法]
var names = (from p in listLog where p.ID == 2 select p.EmpName).ToList();
[解决办法]
var names = (from p in listLog where p.ID == 2 select p.EmpName).FirstOrDefault();

如果ID是唯一的,建议你这样写:

var names = (from p in listLog where p.ID == 2 select p.EmpName).SingleOrDefault();
[解决办法]
查询出来的name不是为空
而是name类型是匿名类的集合

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