Question

我正在努力弄清楚如何在以下场景中删除并添加observableCollection：

    Dim flightsColl As New ObservableCollection(Of Flight)
    Dim f1 As Flight = New Flight With {.FlightName = "Jet1"}
    Dim f2 As Flight = New Flight With {.FlightName = "Boeing"}

    Dim p1 As Passenger = New Passenger() With {.Name = "Tim", .Address = "address1"}
    Dim p2 As Passenger = New Passenger() With {.Name = "Tom", .Address = "address2"}
    Dim p3 As Passenger = New Passenger() With {.Name = "Tas", .Address = "address3"}

    'add 2 passangers to Jet1

    f1.Passengers.Add(p1)
    f1.Passengers.Add(p2)

    'add passnger3 to boeing
    f2.Passengers.Add(p3)

    'add flight1 & 2 to flight list
    flightsColl.Add(f1)
    flightsColl.Add(f2)

在上面例如，我有一个flightColl，这是一个可观察的集合你可以看到它有2个航班，第一个有2个乘客，第二个有1个乘客

现在，如果我必须将乘客2（p2）移动到2号航班，那么来自flightsColl我必须 Remove Passenger 2 from flight 1

Add Passenger 2 to flight 2

更新

Public Class Flight

Public Property Name() As String
Public Property Passengers As ICollection(Of Passenger)


Public Sub New()
    Me.Appliances = New ObservableCollection(Of Passenger)
End Sub

结束班

Answer 1

你为什么要通过flightColl？您可以参考航班和乘客。

f1.Passengers.Remove(p2)

...等

**更新**

Dim oldflight As Flight = flightsColl.FirstOrDefault(Function(f) f.FlightName = "oldFlightName")
Dim passenger As Passenger = oldflight.Passengers.FirstOrDefault(Function(p) p.Name = "passengerName")
oldflight.Passengers.Remove(passenger)

Dim newflight As Flight = flightsColl.FirstOrDefault(Function(f) f.FlightName = "newFlightName")
newflight.Passengers.Add(passenger)

这有帮助吗？您需要在那里添加一些错误检查（如果您不想意外删除具有相同名称的其他乘客，SingleOrDefault会更好）

从observablecollection中删除项目

1 个答案: