Question

我在使用WP8中的Linq to SQL更新项目时遇到问题。当我运行代码时，对象在通过应用程序时会更新。但是，一旦我离开应用程序，更新就会丢失。

似乎.SubmitChanges（）不起作用。可能是什么原因？

Public Sub AdjustTile(ByVal thisTile As TileObject, ByVal info As Integer)

        Dim query = From row As TileObject In tileDb.TileTable
                    Where row.id = thisTile.id
                    Select row

        For Each row As TileObject In query
                row.ChoosenWide = info
        Next

        tileDb.SubmitChanges()

End sub

InsertOnSubmit和DeleteOnSubmit函数正常工作......

Answer 1

好的，我发现了我的新手错误。事实证明，我忘了添加：

NotifyPropertyChanging（“ChoosenWide”）和NotifyPropertyChanged（“ChoosenWide”）

请参阅http://code.msdn.microsoft.com/wpapps/Local-Database-Sample-57b1614c

谢谢alsafoo＆amp;我们的帮助。

    Private _ChoosenWide As Integer
    <Column()>
    Public Property ChoosenWide() As Integer
        Get
            Return _ChoosenWide
        End Get
        Set(ByVal value As Integer)
            If _ChoosenWide <> value Then
                NotifyPropertyChanging("ChoosenWide")
                _ChoosenWide = value
                NotifyPropertyChanged("ChoosenWide")
            End If
        End Set
    End Property

LINQ to SQL中的.SubmitChanges（）不起作用

1 个答案: