使用范围和计算值在LINQ中分组

以下各项的LINQ等效语句是什么

SELECT FLOOR(Value / @Step) * @Step AS Bin,
       COUNT(*) AS Cnt
FROM Measurements
WHERE (StepId = @StepId)
GROUP BY Bin
ORDER BY Bin

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不清楚这些参数或列来自何处，但假设LINQ到SQL，这应该或多或少等效：

var step = ...;
var stepId = ...;
var query =
    from m in dc.Measurements
    where m.StepId == stepId
    group m by m.Bin into g
    orderby g.Key
    select new
    {
        Bin = Math.Floor(Value / step) * step, // where did "Value" come from?
        Cnt = g.Count(),
    };

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使用Lambda表达式：

var query = dc.Measurements.AsEnumerable().Where(x=>x.StepId=_stepId).
GroupBy(g=>g.Bin).Select(xg=>new
    {
        Bin = Math.Floor(Value / step) * step, 
        Cnt = xg.Count(),
    }
 );

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value是从主键为StepId的度量表返回的度量值