选择时WPF DataGrid更新列值

Question

我有一个wpf数据网格，其中一列包含一个自动完成框，当输入帐号时，它应该更新下一列中的描述。对于我的生活，我无法让它发挥作用。我能够在自动完成框中进行选择，并更新绑定对象，但描述永远不会更新。我在父模型和子模型以及ViewModel上使用（或至少尝试使用）INotifyPropertyChanged（通过PropertyChanged.Fody），但我不确定我是否正确使用它。绑定似乎正在起作用，但我认为问题在于，当在自动选择中进行选择时，会在行上更改帐号属性，但不会在行和帐户对象之间建立实际关联。由于没有关联，描述仍然是空白的。至少这是我的理论。如何让描述字段正确更新？

这是设置父母和孩子的方式。

这是父模型：

public class Transaction : RealmObject, INotifyPropertyChanged
{
    // PropertyChanged.Fody
    public event PropertyChangedEventHandler PropertyChanged;

    [PrimaryKey]
    public string ID { get; set; } = Guid.NewGuid().ToString(); // For Realm
    public string ReportBasis { get; set; } 
    public string ReportName { get; set; } 
    public DateTimeOffset StartPeriod { get; set; } 
    public DateTimeOffset EndPeriod { get; set; } 
    public DateTimeOffset RunTime { get; set; } 

    public IList<TransactionDetails> Rows { get; }
}

这就是孩子：

public class TransactionDetails : RealmObject, INotifyPropertyChanged
{
    Public event PropertyChangedEventHandler PropertyChanged;

    [PrimaryKey]
    public string ID { get; set; } = Guid.NewGuid().ToString(); // For Realm
    public Account Account { get; set; } 
    public string Comment { get; set; }
    public double? DebitAmount { get; set; }
    public double? CreditAmount { get; set; }
    public TransactionDetails()
    {
        this.Account = new Account() { RawAccountNumber = "", AccountKey = "", Description = "" };
    }
}

这是帐户对象

public class Account : RealmObject, INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    [PrimaryKey]
    public string ID { get; set; } = Guid.NewGuid().ToString();
    public string AccountKey { get; set; }
    public string Description { get; set; }
    public string RawAccountNumber { get; set; } //110100000
    public string FormattedAccountNumber { get; set; } // 1101-00-00
    public string Status { get; set; }
    public DateTimeOffset DateUpdated { get; set; }
}   

ViewModel只有一个事务

public class MainWindowViewModel : BaseViewModel
{

    private Transaction _transaction;
    public Transaction Transaction
    {
        get { return _transaction; }
        set {
            _transaction = value;
        }
    }
    ... 
    private async void GetTransactions()
    {
        var qb = new QB();
        Transaction = await qb.GetTransactions( StartDate, EndDate );
    }
    ...
}

其行通过Xaml绑定到DataGrid：

<DataGrid x:Name="TransactionsGrid" 
              DataGridCell.Selected="DataGrid_GotFocus" 
              AutoGenerateColumns="False" 
              HorizontalAlignment="Left" 
              Margin="10,51,0,0" 
              VerticalAlignment="Top" 
              Height="540"
              Width="902" 
              ItemsSource="{Binding Transaction.Rows}">
        <DataGrid.Columns>      
            <DataGridTemplateColumn Header="Account Number" >
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <StackPanel>
                            <TextBox BorderThickness="0" 
                                     Text="{Binding Account.RawAccountNumber}"/>
                        </StackPanel>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
                <DataGridTemplateColumn.CellEditingTemplate>
                    <DataTemplate>
                        <StackPanel>
                            <toolkit:AutoCompleteBox
                                Background="AliceBlue"
                                IsTextCompletionEnabled="True"
                                FilterMode="Contains"
                                MinimumPrefixLength="2"
                                ValueMemberPath="RawAccountNumber"
                                PreviewTextInput="AutoCompleteBox_PreviewTextInput"
                                Text="{Binding Account.RawAccountNumber, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnExceptions=True}"
                                ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Path=DataContext.Accounts}" >
                                <toolkit:AutoCompleteBox.ItemTemplate>
                                    <DataTemplate>
                                        <StackPanel Orientation="Horizontal">
                                            <TextBlock Text="{Binding RawAccountNumber}" FontWeight="Bold" Width="100"/>
                                            <TextBlock Text="{Binding Description}" />
                                        </StackPanel>
                                    </DataTemplate>
                                </toolkit:AutoCompleteBox.ItemTemplate>
                            </toolkit:AutoCompleteBox>
                        </StackPanel>
                    </DataTemplate>
                </DataGridTemplateColumn.CellEditingTemplate>
            </DataGridTemplateColumn>
            <DataGridTextColumn Header="Account Description" Width="Auto" Binding="{Binding Account.Description}" IsReadOnly="True" /> <!-- This should update when the account is selected in the autocomplete box above -->
            <Controls:DataGridNumericUpDownColumn Header="Debit" Width="Auto" Binding="{Binding DebitAmount, Mode=TwoWay }" Minimum="0" StringFormat="{}{0:C}" />
            <Controls:DataGridNumericUpDownColumn Header="Credit" Width="Auto" Binding="{Binding CreditAmount, Mode=TwoWay}" Minimum="0" StringFormat="{}{0:C}" />
        </DataGrid.Columns>            
    </DataGrid>

我正在摸索着这一点。有人可以看看这个并指出我正确的方向吗？