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copied!<p><strong>Update 2:*</strong></p> <p>Now <strong>Payment</strong> is passed to <strong>PaymentDetailInfo</strong> at construction. <strong>PaymentDetailInfo</strong> wraps the properties of <strong>Payment</strong> so you can create your binding on <strong>PaymentDetailInfo</strong> alone. </p> <p>I've made the setter of <strong>SumOfValidNormalOverTimePrice</strong> private. I think this should work but I haven't tested it.</p> <pre><code>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); } } </code></pre> <p><strong>Update:</strong></p> <p>Since a change in <strong>Payment</strong> should trigger the update I would reverse the association between <strong>Payment</strong> and <strong>PaymentDetailInfo</strong>. Then make the binding on <strong>payment.DetailInfo</strong>.</p> <pre><code>public class Payment { public PaymentDetailInfo DetailInfo = new PaymentDetailInfo(); private int _consideredValidNormalOverTime = 0; public int ConsideredValidNormalOverTime { get { _return _consideredValidNormalOverTime; } set { _consideredValidNormalOverTime = value; DetailInfo.SumOfValidNormalOverTimePrice = _consideredValidNormalOverTime; } } } public class PaymentDetailInfo : INotifyPropertyChanged { private int _sumOfValidNormalOverTimePrice = 0; public int SumOfValidNormalOverTimePrice { get { return __sumOfValidNormalOverTimePrice; } set { __sumOfValidNormalOverTimePrice = 100 * value / 60; OnPropertyChanged(new PropertyChangedEventArgs("SumOfValidNormalOverTimePrice")); } } public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged(PropertyChangedEventArgs e) { if (PropertyChanged != null) PropertyChanged(this, e); } } </code></pre> <p>Now when <strong>ConsideredValidNormalOverTime</strong> is updated <strong>SumOfValidNormalOverTimePrice</strong> is too and automatically updates the source. Implement this for all remaining properties and it should work. Just think about where to put the logic for <strong>SumOfOverPriceConst</strong>. Since it relies heavily on <strong>Payment</strong> maybe you should put it there.</p> <p><strong>Original:</strong></p> <p>Here's a sample of implementing <strong>INotifyPropertyChanged</strong>. Whenever <strong>Name</strong> changes the target is updated.</p> <pre><code>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 </code></pre>

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