/// <summary>
/// When overridden in a derived class, extracts the appropriate dependency from the root of the expression.
/// </summary>
/// <param name="rootExpression">The root expression.</param>
/// <param name="propertyPath">The property path.</param>
/// <returns></returns>
protected override IDependencyDefinition ExtractFromRoot(Expression rootExpression, string propertyPath)
{
IDependencyDefinition result = null;
if (rootExpression is ConstantExpression)
{
var constantExpression = (ConstantExpression) rootExpression;
if (propertyPath != null || (propertyPath == null && constantExpression.Value is INotifyPropertyChanged))
{
result = new ExternalDependencyDefinition(propertyPath, constantExpression.Value);
}
}
return result;
}
/// <summary>
/// When overridden in a derived class, extracts the appropriate dependency from the root of the expression.
/// </summary>
/// <param name="rootExpression">The root expression.</param>
/// <param name="propertyPath">The property path.</param>
/// <returns></returns>
protected override IDependencyDefinition ExtractFromRoot(Expression rootExpression, string propertyPath)
{
IDependencyDefinition result = null;
if (rootExpression is ConstantExpression)
{
var constantExpression = (ConstantExpression)rootExpression;
if (propertyPath != null || (propertyPath == null && constantExpression.Value is INotifyPropertyChanged))
{
result = new ExternalDependencyDefinition(propertyPath, constantExpression.Value);
}
}
return(result);
}
