我正在尝试使用LINQ(到EF)获取DISTINCT列表然后对其进行排序。我找到的所有示例都根据DISTINCT值对结果进行排序。但我想在不同的领域进行排序。
示例:包含2个字段的表(canvasSize和canvasLength);
var sizes = (from s in ent.competitors
select s.canvasSize).Distinct().OrderBy(x => x);
我找到的所有例子都给出了这种答案。但它按canvasSize排序,而我想按canvasLength排序。
我被卡住了...非常感谢任何提示...
Per J. Skeet>其他信息:
company canvasSize canvasLength
abc 8x10 8
d 8x10 8
e 10x10 10
f 10x10 10
g 40x40 40
我希望它在canvasSize上有所区别。问题是,在排序时,它会产生以下顺序:
10x10
40x40
8x10
我想要相同的结果集,但使用canvasLength排序,结果是:
8x10
10x10
40x40
答案 0 :(得分:12)
我认为你所追求的可能是这样的:
var sizes = (from s in ent.competitors
select new { s.canvasSize, s.canvasLength })
.Distinct()
.OrderBy(x => x.canvasLength);
<强>更新强>
根据您问题中的额外信息,以下内容应该符合您的要求:
var sizes = ent.competitors
.Select(c => new {c.canvasSize, c.canvasLength})
.Distinct()
.OrderBy(x => x.canvasLength)
.Select(x => x.CanvasSize)
答案 1 :(得分:2)
var sizes = ent.competitors
.GroupBy(s => s.canvasSize)
.Select(g => g.First())
.OrderBy(s => s.canvasLength);