我有一个简单的类数据,
var data = new List<PlainData>
{
new PlainData {Name = "A", Owner = "X"},
new PlainData {Name = "A", Owner = "Y"},
new PlainData {Name = "B", Owner = "X"}
};
在同一Name
,我拥有一个或多个所有者。
现在,我想将此数据转换为基于列表的所有者,例如下面的类,
public class ListBasedData
{
public string Name { get; set; }
public List<string> Owners { get; set; }
}
在这里我想做的是,如何抓住名称的所有所有者?
List<ListBasedData> listBasedDatas = new List<ListBasedData>();
var groups = data.GroupBy(a => a.Name);
foreach (var group in groups)
{
var a = group.Key;
var b = group.ToList();
listBasedDatas.Add(new ListBasedData{Name = group.Key, Owners = });
}
答案 0 :(得分:2)
List<ListBasedData> listBasedDatas = data
.GroupBy(a => a.Name)
.Select(grp => new ListBasedData
{
Name = grp.Key,
Owners = grp.Select(x => x.Owner).ToList()
})
.ToList();
关键是使用Select
对从PlainData
到string
的每个组中的所有者进行投影。