Created
May 7, 2015 11:48
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public abstract class BaseObject : INotifyPropertyChanged | |
{ | |
public event PropertyChangedEventHandler PropertyChanged; | |
protected void Setter<T>(ref T setter, T newVal, Expression<Func<T>> property, params Expression<Func<object>>[] dependentProperties) | |
{ | |
if (!equals(GetPropValue(property), newVal)) | |
{ | |
setter = newVal; | |
NotifyDependentProps(property, dependentProperties); | |
} | |
} | |
private static string GetPropertyName<TZ>(Expression<Func<TZ>> property) | |
{ | |
return GetPropertyInfo(property).Name; | |
} | |
private static PropertyInfo GetPropertyInfo<T>(Expression<Func<T>> property) | |
{ | |
MemberExpression expression; | |
var body = property.Body as UnaryExpression; | |
if (body != null) | |
expression = (MemberExpression)body.Operand; //for value types | |
else | |
expression = ((MemberExpression)property.Body); | |
var pi = expression.Member as PropertyInfo; | |
if (pi == null) | |
throw new ArgumentException("expression must be valid property"); | |
return pi; | |
} | |
private void ValueChanged<TA>(Expression<Func<TA>> property) | |
{ | |
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(GetPropertyName(property))); | |
} | |
private void NotifyDependentProps<T>(Expression<Func<T>> property, Expression<Func<object>>[] dependentProps) | |
{ | |
ValueChanged(property); | |
if (dependentProps != null && dependentProps.Length > 0) | |
{ | |
foreach (Expression<Func<object>> t in dependentProps) | |
ValueChanged(t); | |
} | |
} | |
private T GetPropValue<T>(Expression<Func<T>> property) | |
{ | |
PropertyInfo pi = GetPropertyInfo(property); | |
return (T)pi.GetValue(this, new object[] { }); | |
} | |
private bool equals<T>(T first, T second) | |
{ | |
return EqualityComparer<T>.Default.Equals(first, second); | |
} | |
} |
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