C# 使用linq使用组嵌套选择

我正在尝试将以下查询转换为linQ表达式：

SELECT t1.lastchanged, 
    currentstatus,
    (SELECT count(ID) 
    FROM [Issues] t2 
    WHERE t2.CurrentStatus = t1.currentstatus and t2.lastchanged <= t1.lastchanged) AS running_total
FROM [Issues] t1 
GROUP BY t1.lastchanged, currentstatus
ORDER BY t1.lastchanged

---

有什么建议吗？

为了让嵌套的select像在sql中一样，从

模型

集合中再次选择

var statusCounts = models.GroupBy(x => new { x.CurrentStatus, x.LastChanged })
                         .Select(g => new 
                         { 
                             CurrentStatus = g.Key.CurrentStatus, 
                             LastChanged = g.Key.LastChanged,
                             Count = models.Count(m => m.CurrentStatus == g.Key.CurrentStatus &&
                                                       m.LastChanged  <= g.Key.LastChanged)
                         })
                         .OrderBy(item => item.Key.LastChanged);

var statusCounts=models.GroupBy（x=>new{x.CurrentStatus，x.LastChanged}）
.选择（g=>new
{ 
CurrentStatus=g.Key.CurrentStatus，
LastChanged=g.Key.LastChanged，
Count=models.Count（m=>m.CurrentStatus==g.Key.CurrentStatus&&
m、 LastChanged项。键。LastChanged）；

或在查询语法中：

var statusCounts = from t1 in models
                   group t1 by new { x.CurrentStatus, x.LastChanged } into g
                   orderby g.Key.LastChanged
                   select new 
                   { 
                       CurrentStatus = g.Key.CurrentStatus, 
                       LastChanged = g.Key.LastChanged,
                       Count = models.Count(m => m.CurrentStatus == g.Key.CurrentStatus &&
                                                 m.LastChanged  <= g.Key.LastChanged)
                   };

var statusCounts=来自模型中的t1
将t1按新的{x.CurrentStatus，x.LastChanged}分组为g
orderby g.Key.LastChanged
选择新的
{ 
CurrentStatus=g.Key.CurrentStatus，
LastChanged=g.Key.LastChanged，
Count=models.Count（m=>m.CurrentStatus==g.Key.CurrentStatus&&
m、 太好了！这就是我需要的。谢谢
var statusCounts = from t1 in models
                   group t1 by new { x.CurrentStatus, x.LastChanged } into g
                   orderby g.Key.LastChanged
                   select new 
                   { 
                       CurrentStatus = g.Key.CurrentStatus, 
                       LastChanged = g.Key.LastChanged,
                       Count = models.Count(m => m.CurrentStatus == g.Key.CurrentStatus &&
                                                 m.LastChanged  <= g.Key.LastChanged)
                   };