/// <summary>
/// Creates a new 'PropertyPath' that throws a 'NullReferenceException'
/// when 'GetValue' or 'SetValue' is called and one of the property path
/// steps (except the last) return null. To create a 'PropertyPath' for
/// the 'Address.City' property of the 'Person' class call
/// '<![CDATA[Create<Person, string>(p => p.Address.City)]]>'.
/// </summary>
public static PropertyPath <TSource, TValue> Create <TSource, TValue>(
Expression <Func <TSource, TValue> > propertyPathSelector
)
{
return(new PropertyPath <TSource, TValue>(
ExpressionService.GetProperties(propertyPathSelector),
useDefaultValue: false
));
}
/// <summary>
/// Creates a new 'PropertyPath' that returns the given 'defaultValue'
/// when 'GetValue' is called and one of the property path steps (except
/// the last) returns null. Calls to 'SetValue' do nothinng in this case.
/// To create a 'PropertyPath' for the 'Address.City' property of the
/// 'Person' class call '<![CDATA[
/// CreateWithDefaultValue<Person, string>(p => p.Address.City, "Unknown")
/// ]]>'.
/// </summary>
public static PropertyPath <TSource, TValue> CreateWithDefaultValue <TSource, TValue>(
Expression <Func <TSource, TValue> > propertyPathSelector,
TValue defaultValue = default(TValue)
)
{
return(new PropertyPath <TSource, TValue>(
ExpressionService.GetProperties(propertyPathSelector),
useDefaultValue: true,
defaultValue: defaultValue
));
}
protected void OnPropertyChanged <T>(Expression <Func <T> > propertySelector)
{
string propertyName = ExpressionService.GetPropertyName(propertySelector);
OnPropertyChanged(propertyName);
}