C# wpf绑定中的源更新

我有一个WPF窗口并给它一个DataContext，当目标更改时，它工作得很好（通过使用

UpdateSourceTrigger

），但当其中一个DataContext属性（源）更改时，目标不会更新。有没有办法在源更新时强制目标绑定更新？对于一个项目是否有类似于

observeablecollection

这是我的班级：

public class PaymentDetailInfo : INotifyPropertyChanged
{
    public Payment Payment
    {
        get;
        set;
    }

    public int SumOfValidNormalOverTimePrice
    {
        get
        {
            return 100 * Payment.ConsideredValidNormalOverTime / 60;
        }
    }
    public int SumOfInvalidNormalOverTimePrice
    {
        get
        {
            return 100 * Payment.ConsideredInvalidNormalOverTime / 60;
        }
    }
    public int SumOfOverPriceConst
    {
        get
        {
            int _sumOfOverPriceConst = 0;

            if (!Payment.ValidNormalOverTimePriceIsPercent)
                _sumOfOverPriceConst += SumOfValidNormalOverTimePrice;

            if (!Payment.InvalidNormalOverTimePriceIsPercent)
                _sumOfOverPriceConst += SumOfInvalidNormalOverTimePrice;

            _sumOfOverPriceConst += Payment.RewardPrice;

            return _sumOfOverPriceConst;
        }
    }
    public event PropertyChangedEventHandler PropertyChanged;

    public void OnPropertyChanged(PropertyChangedEventArgs e)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, e);
    }

}

---

我的窗口中的某些元素绑定到

PaymentDetailInfo

的

Payment

（Payment是一个数据库表），因此，作为一个示例，用户可以更改

Payment.consideredvalidnormalevertime

然后

PaymentDetailInfo.sumofvalidnormalevertimeprice

将更改，然后

PaymentDetailInfo.SumOfOverPriceConst

将更改。但是绑定到PaymentDetailInfo.sumoforpriceconst的目标不会更新，即使我表单的数据上下文已更新。

更新2:

public class Foo: INotifyPropertyChanged
{
    #region field and properties

    private string _name = String.Empty;

    public string Name
    {
        get { return _name; }
        set
        {
            _name = value;
            OnPropertyChanged(new PropertyChangedEventArgs("Name"));
        }
    }


    #endregion

    #region INotifyPropertyChanged implementation

    public event PropertyChangedEventHandler PropertyChanged;

    public void OnPropertyChanged(PropertyChangedEventArgs e)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, e);
    }

    #endregion

现在，付款在施工时传递给付款详细信息PaymentDetailInfo包装了Payment的属性，因此您可以单独在PaymentDetailInfo上创建绑定

我已经把SumOfValidNormalOverTimePrice的设定者定为私人。我想这应该行得通，但我还没有测试过

public class PaymentDetailInfo : INotifyPropertyChanged
{

/// <summary> The payment model.
/// </summary>
private Payment _model = null;

/// <summary> Constructor.
/// </summary>
public PaymentDetailInfo(Payment payment)
{
    _model = payment;
}

/// <summary> Wrapper around Payment.ConsideredValidNormalOverTime.
/// </summary>
public int ConsideredValidNormalOverTime
{
    get { return _model.ConsideredValidNormalOverTime; }
    set
    {
        _model.ConsideredValidNormalOverTime = value;

        // make sure to set the property and not the backing field, otherwise OnPropertyChanged won't be 
        // called and the value of _sumOfValidNormalOverTimePrice will be incorrect
        SumOfValidNormalOverTimePrice = value;

        OnPropertyChanged(new PropertyChangedEventArgs("ConsideredValidNormalOverTime"));
    }
}

private int _sumOfValidNormalOverTimePrice = 0;
public int SumOfValidNormalOverTimePrice
{
    get { return _sumOfValidNormalOverTimePrice; }
    private set
    {
        _sumOfValidNormalOverTimePrice = 100 * value / 60;
        OnPropertyChanged(new PropertyChangedEventArgs("SumOfValidNormalOverTimePrice"));
    }
}

public event PropertyChangedEventHandler PropertyChanged;

public void OnPropertyChanged(PropertyChangedEventArgs e)
{
    if (PropertyChanged != null)
        PropertyChanged(this, e);
}
}

现在，当更新ConsidedValidnormalevertime时，也会自动更新源。对所有剩余属性执行此操作，它应该可以工作。只需考虑将SumoForPriceConst的逻辑放在哪里即可。由于它严重依赖于付款，也许你应该把它放在那里

原件：

下面是实现INotifyPropertyChanged的示例。每当Name更改时，目标就会更新

public class Foo: INotifyPropertyChanged
{
    #region field and properties

    private string _name = String.Empty;

    public string Name
    {
        get { return _name; }
        set
        {
            _name = value;
            OnPropertyChanged(new PropertyChangedEventArgs("Name"));
        }
    }


    #endregion

    #region INotifyPropertyChanged implementation

    public event PropertyChangedEventHandler PropertyChanged;

    public void OnPropertyChanged(PropertyChangedEventArgs e)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, e);
    }

    #endregion

---

在数据类上实现INotifyPropertyChanged接口以更新目标绑定。这是使用MVVM更新目标的标准方法。你能发布你的代码吗？我更新了我的问题，我不知道在哪里我必须调用PropertyChanged（new PropertyChangedEventArgs（“Name”）；类Foo仅在名称实际更改时调用PropertyChanged。你的类只包含getter，除了Payment之外没有setter。您想在付款更改时更新所有属性吗？我想在付款的每个属性更新时更新PaymentDetailInfo.SumOfOverPriceConst。我已经更新了答案。如果这回答了你的问题，请告诉我。我非常感谢你的回答，但付款是一个数据库表，我不想这样更改它。