Vb.net 如何将两个LINQ数据源合并到一个图表的单个表中？

我正在尝试获取两个值，让我的SQL server为每个月的每一天计算两个不同的值，并将它们放在一个表中，以便在图形中使用

我试图用Union将它们合并到一个数据源中，但它无法编译。下面的代码给出了我在两个不同数据源中需要的结果

这段代码为我提供了所需的结果

    Dim ChartDataOpen = (From a In db.Alarms _
             Where a.Generated >= FirstDayOfMonth(DateTimeNow) And a.Generated <= LastDayOfMonth(DateTimeNow) And a.IsClosed = False _
             Group a By CalendarDate = a.Generated.Value.Date Into g = Group _
             Select New With {CalendarDate, .AlarmCount = g.Count()})

    Dim ChartDataClosed = (From a In db.Alarms _
             Where a.Generated >= FirstDayOfMonth(DateTimeNow) And a.Generated <= LastDayOfMonth(DateTimeNow) And a.IsClosed = True _
             Group a By CalendarDate = a.Generated.Value.Date Into g = Group _
             Select New With {CalendarDate, .AlarmClosedCount = g.Count()})

最终工作代码：

    Dim ChartData = (From a In db.Alarms _
     Where a.Generated >= FirstDayOfMonth(DateTimeNow) _
       And a.Generated <= LastDayOfMonth(DateTimeNow) _
     Group a By CalendarDate = a.Generated.Value.Date Into g = Group _
     Select New With {
          CalendarDate,
          .AlarmCount = g.Count(),
          .AlarmOpenCount = g.Count(Function(a) a.IsClosed = False),
          .AlarmClosedCount = g.Count(Function(a) a.IsClosed = True)
          })

---

创建具有相同属性的命名对象：

我可以用C语言完成这项工作。您需要为VB.NET进行转换

public class CalendarCount
{
     public dateTime CalendarDate {get; set;}
     public int Count {get; set;}
}

这部分我要猜测vb语法：

Dim ChartDataOpen = (From a In db.Alarms _
         Where a.Generated >= FirstDayOfMonth(DateTimeNow) _
         And a.Generated <= LastDayOfMonth(DateTimeNow) And a.IsClosed = False _
         Group a By CalendarDate = a.Generated.Value.Date Into g = Group _
         Select New CalendarCount With {CalendarDate, .Count = g.Count()})

Dim ChartDataClosed = (From a In db.Alarms _
         Where a.Generated >= FirstDayOfMonth(DateTimeNow) _
         And a.Generated <= LastDayOfMonth(DateTimeNow) And a.IsClosed = True _
         Group a By CalendarDate = a.Generated.Value.Date Into g = Group _
         Select New CalendarCount With {CalendarDate, .Count = g.Count()})

---

我认为您所追求的是一种结构，在该结构中，您可以看到一行中的打开和关闭计数：

Dim ChartData = (From a In db.Alarms _
         Where a.Generated >= FirstDayOfMonth(DateTimeNow) _
           And a.Generated <= LastDayOfMonth(DateTimeNow) _
         Group a By CalendarDate = a.Generated.Value.Date Into g = Group _
         Select New With {
                             CalendarDate,
                            .AlarmCount = g.Count(Function(x) Not x.IsClosed)
                            .AlarmClosedCount = g.Count(Function(x) x.IsClosed)
                         })

---

您应该能够在图表中以每个日期两个点或两条线绘制此结果。

但是如何将两个结果合并到一个源中？您是正确的，我将在一行中获取该数据。x和a没有在Select New With中声明，你能向我解释一下这部分代码吗？啊，该死，这是我的C方言。我能够理解你在做什么，并得到了它！非常感谢。使用工作代码更新OP。

Dim ChartData = (From a In db.Alarms _
         Where a.Generated >= FirstDayOfMonth(DateTimeNow) _
           And a.Generated <= LastDayOfMonth(DateTimeNow) _
         Group a By CalendarDate = a.Generated.Value.Date Into g = Group _
         Select New With {
                             CalendarDate,
                            .AlarmCount = g.Count(Function(x) Not x.IsClosed)
                            .AlarmClosedCount = g.Count(Function(x) x.IsClosed)
                         })