Question

我尝试在gridview中设置组合框，但所有组合框都包含相同的值，而不是数据库中的值。我正在使用实体框架和WPF。两个表之间存在父子关系，但组合框的源是一个单独的表，其中包含标记的名称和ID。我一直在寻找。希望这不会太容易解决。

“标记”列显示组合框。列“标签ID”显示数据库中的值。当我显示数据时，TagID会在不同的行中发生变化，但Tag列在所有行中都是相同的（第一个选择）。当我改变一个组合框时，它们都会改变。我看不出他们在哪里联系在一起。您可以提供的任何帮助将不胜感激。（澎马？）

这是XAML

<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="372" Width="675" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:my="clr-namespace:TagFinanceWPF">
<Window.Resources>
    <CollectionViewSource x:Key="TransactionsViewSource" d:DesignSource="{d:DesignInstance my:Transaction, CreateList=True}" />
    <CollectionViewSource x:Key="TransactionsTransactionTagsViewSource" Source="{Binding Path=TransactionTags, Source={StaticResource TransactionsViewSource}}" />
    <CollectionViewSource x:Key="TagLookup" />
</Window.Resources>
<Grid DataContext="{StaticResource TransactionsViewSource}">
    <ListView ItemsSource="{Binding Source={StaticResource TransactionsTransactionTagsViewSource}}" Margin="12" Name="TransactionTagsListView" SelectionMode="Single">
        <ListView.ItemContainerStyle>
            <Style>
                <Setter Property="Control.HorizontalContentAlignment" Value="Stretch" />
                <Setter Property="Control.VerticalContentAlignment" Value="Stretch" />
            </Style>
        </ListView.ItemContainerStyle>
        <ListView.View>
            <GridView>
                <GridViewColumn x:Name="TransactionIDColumn1" Header="Transaction ID" Width="80">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <Label Content="{Binding Path=TransactionID}" Margin="6,-1,-6,-1" />
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
                <GridViewColumn x:Name="TagIDColumn" Header="Tag" Width="80">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox Margin="-6,-1" 
                                      ItemsSource="{Binding Source={StaticResource TagLookup}}" 
                                      DisplayMemberPath="TagName" 
                                      SelectedValuePath="TagID"
                                      SelectedValue="{Binding TagID}" 
                                      IsReadOnly="True">
                            </ComboBox>
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>

                <GridViewColumn x:Name="TagIDColumn2" Header="Tag ID" Width="80">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <Label Content="{Binding Path=TagID}" />
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
            </GridView>
        </ListView.View>
    </ListView>
</Grid>

VB代码是：

Class MainWindow

Dim BentleyvideoEntities As TagFinanceWPF.bentleyvideoEntities = New TagFinanceWPF.bentleyvideoEntities()

Private Function GetTransactionsQuery(ByVal BentleyvideoEntities As TagFinanceWPF.bentleyvideoEntities) As System.Data.Objects.ObjectQuery(Of TagFinanceWPF.Transaction)

    Dim TransactionsQuery As System.Data.Objects.ObjectQuery(Of TagFinanceWPF.Transaction) = BentleyvideoEntities.Transactions
    'Update the query to include TransactionTags data in Transactions. You can modify this code as needed.
    TransactionsQuery = TransactionsQuery.Include("TransactionTags")
    'Returns an ObjectQuery.
    Return TransactionsQuery
End Function

Private Sub Window_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded

    'Load data into Transactions. You can modify this code as needed.
    Dim TransactionsViewSource As System.Windows.Data.CollectionViewSource = CType(Me.FindResource("TransactionsViewSource"), System.Windows.Data.CollectionViewSource)
    Dim TransactionsQuery As System.Data.Objects.ObjectQuery(Of TagFinanceWPF.Transaction) = Me.GetTransactionsQuery(BentleyvideoEntities)
    TransactionsViewSource.Source = TransactionsQuery.Execute(System.Data.Objects.MergeOption.AppendOnly)
    'Load data into Tags. You can modify this code as needed.


    Dim customerList = From c In BentleyvideoEntities.Tags _
                                  Order By c.TagName

    Dim custSource = CType(Me.FindResource("TagLookup"), CollectionViewSource)
    custSource.Source = customerList.ToList()

End Sub

结束班

Answer 1

我在研究您的问题时找到this，听起来就像您遇到的完全相同的问题。

链接中的Snippit：

我不确定这是否会有所帮助，但我在Chris Sells的Windows中阅读表格绑定在C＃，脚注，页面 482'，数据源绑定每个组合框由一个管理反过来常见的绑定管理器是绑定上下文的一部分。该绑定amager保留所有组合框同步到同一行数据库。但是，如果每个组合框因此，具有不同的Binding上下文一个不同的绑定管理器，然后是组合框可以显示不同的行来自相同的数据源。

基于this second文章（和建议的解决方案），您需要使用行数据绑定事件来设置组合框的绑定，以便为每个行绑定创建一个新的绑定管理器实例。

GridView中的组合框是同步的，而不是绑定到数据库中的值

1 个答案: