DBContext.ChangeTracker未检测到对Array的更改

时间:2017-07-25 22:39:11

标签: arrays vb.net entity-framework data-binding

我在VB.NET中的EF6项目使用以下映射映射到MySQL数据库:

Partial Public Class WorkRule 
    Public Property WorkRuleID As Integer 'Maps to int
    Public Property Description As String 'Maps to tinytext
    Public Property RegularTime As Byte() 'Maps to tinyblob
End Class

如果我编辑“说明”文本框,则会在调用.SaveChanges时检测到并按预期保存更改。但是,如果我编辑绑定到数组元素的其中一个文本框的内容,则更改绑定元素,但DBContext.ChangeTracker不会检测到更改,并且在调用.SaveChanges时更改不会保存到数据库中。

我可以通过手动设置DBContext.Entry()强制保存.State = EntityState.Modified但是有更好的方法来执行此操作,因此会自动检测对数组元素的更改吗?我应该使用除数组之外的东西吗?

代码如下:

XAML:

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <ListBox x:Name="lstWorkRules"/>
        <StackPanel Grid.Column="1" DataContext="{Binding ElementName=lstWorkRules, Path=SelectedItem}">
            <Label>Description:</Label>
            <TextBox Text="{Binding Path=Description}"/>
            <Label>Day 1:</Label>
            <TextBox Text="{Binding Path=RegularTime[0]}"/>
            <Label>Day 2:</Label>
            <TextBox Text="{Binding Path=RegularTime[1]}"/>
            <Label>Etc.</Label>
            <Button Click="Button_Click">Save</Button>
        </StackPanel>

    </Grid>

VB:

Imports System.Data.Entity

Class MainWindow
    Dim wrContext As WorkRuleEntities

    Private Sub Window_Loaded(sender As Object, e As RoutedEventArgs)
        wrContext = New WorkRuleEntities
        wrContext.WorkRules.Load

        lstWorkRules.ItemsSource = wrContext.WorkRules.Local
        lstWorkRules.DisplayMemberPath = "Description"
    End Sub

    Private Sub Button_Click(sender As Object, e As RoutedEventArgs)
        wrContext.SaveChanges()
    End Sub
End Class

0 个答案:

没有答案
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