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分享急！linq中如何传入参数查询
public IEnumerable<IGrouping<string,Student>> GroupBy(object obj)
{
PropertyInfo property = typeof(Student).GetProperty(obj.ToString ());
string field = string.Format("student.{0}", property.Name);
FieldInfo fields = typeof(Student).GetField(obj.ToString());
var studentQuery = from student in stu
group student by string.Format("student.{0}",property.Name) ;
return studentQuery;
}
这个我就想用传入的参数来标示，怎么实现啊
{
PropertyInfo property = typeof(Student).GetProperty(obj.ToString ());
string field = string.Format("student.{0}", property.Name);
FieldInfo fields = typeof(Student).GetField(obj.ToString());
var studentQuery = from student in stu
group student by string.Format("student.{0}",property.Name) ;
return studentQuery;
}
这个我就想用传入的参数来标示，怎么实现啊
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q107770540 2010-09-19
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我写了一个demo
供LZ参考：
供LZ参考：
class Student
{
public string name { get; set; }
public int value { get; set; }
public Student(string _name, int _value)
{
name = _name;
value = _value;
}
}
string GroupByWhat(Student stu,string s1)
{
if (s1 == "name")
{
return stu.name;
}
else
{
return stu.value.ToString();
}
}
void Main()
{
List<Student> list = new List<Student>();
list.Add(new Student(" stu1",1));
list.Add(new Student(" stu2",2));
list.Add(new Student(" stu2", 3));
list.Add(new Student(" stu4", 3));
var query = from l in list
group l by GroupByWhat(l,"value") into m
select m;
}
q107770540 2010-09-19
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[Quote=引用 1 楼 huminghua 的回复:]
你上面那句话还没完整吧！还有个Select把！呵呵！
[/Quote]
语法不仅这一处错误
group..by..into...
你上面那句话还没完整吧！还有个Select把！呵呵！
[/Quote]
语法不仅这一处错误
group..by..into...
huminghua 2010-09-19
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你上面那句话还没完整吧！还有个Select把！呵呵！
