Question

我有一个名为PhoneRecords的模型，其上有两个属性，一个CostCodeId（在数据库中）和CostCode通过CostCodeId与之关联，由Entity Framework创建。我有一个ComboBox，用户可以选择CostCode，我希望他们能够更新它。这是ComboBox：

<ComboBox Grid.Row="5" Grid.Column="1" 
            ItemsSource="{Binding AllCostCodes}"
            DisplayMemberPath="Text" 
            IsSynchronizedWithCurrentItem="True"
            SelectedItem="{Binding SelectedRecord.CostCode}"/>

我像这样更新PhoneRecord（SelectedRecord）：

using (var context = new DashboardContext())
{
    var original = context.PhoneRecords.FirstOrDefault(c => c.Id == SelectedRecord.Id);
    if (original == null) return false;
    context.Entry(original).CurrentValues.SetValues(SelectedRecord);
    return context.SaveChanges() > 0;
}

现在，当我深入研究SelectedRecord后，在用户选择CostCode中的其他ComboBox后，CostCode属性与PhoneRecord相关联已更新，但CostCodeId尚未更新。因此，context.SaveChanges()始终返回0，因为它未检测到属性已更新。

我的问题是如何将CostCode上选定的ComboBox与SelectedRecord.CostCode和SelectedRecord.CostCodeId对齐？

编辑：PhoneRecord.cs由EF生成：

public partial class PhoneRecord
{
    public int Id { get; set; }
    public Nullable<System.DateTime> DateGiven { get; set; }
    public string PersonName { get; set; }
    public Nullable<int> PhoneModelId { get; set; }
    public Nullable<bool> NMU { get; set; }
    public string IMEI { get; set; }
    public string Number { get; set; }
    public Nullable<int> CostCodeId { get; set; }
    public Nullable<System.DateTime> DateReturned { get; set; }
    public string WhyReturned { get; set; }
    public string Solution { get; set; }
    public string Internet { get; set; }
    public string Provider { get; set; }
    public string SpeedDial { get; set; }
    public string OnDatabases { get; set; }
    public string Notes { get; set; }

    public virtual CostCode CostCode { get; set; }
    public virtual PhoneModel PhoneModel { get; set; }
}

Answer 1

ComboBox控件设置一个属性。该逻辑应该在PhoneRecords类中实现。像这样：

public partial class PhoneRecord
{
    private CostCode _costCode;
    public CostCode UiCostCode
    {
        get { return _costCode; }
        set
        {
            _costCode = value;
            CostCodeId = _costCode != null ? _costCode.CostCodeId : 0;
        }
    }
}

ComboBox选择不更新模型

1 个答案: