public static void WalkObjectGraph(object currentNode, bool walkCollections, WalkGraphAction action, Stack <object> objectStack, Func <PropertyInfo, bool> performActionOnProperty, Func <Type, bool> interestingTypeFunction = null)
{
if (currentNode == null)
{
return;
}
if (null == objectStack)
{
// Maintain a stack of objects in the hierarchy so we don't get stuck processing loops in the graph
objectStack = new Stack <object>();
}
else if (objectStack.Contains(currentNode))
{
// We've already walked this object, so we have a circular reference, let's not overflow the stack.
return;
}
objectStack.Push(currentNode);
interestingTypeFunction = interestingTypeFunction ?? (t => true);
// Act on the current object
if (interestingTypeFunction(currentNode.GetType()))
{
action(null, currentNode, objectStack);
}
// Walk down into the object graph for properties that have objects
var objectProperties = currentNode.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance);
foreach (var prop in objectProperties)
{
// Skip read or write only properties
if (!prop.CanRead || !prop.CanWrite)
{
continue;
}
// Check to see if we should perform the action() on this property
if (performActionOnProperty(prop) && interestingTypeFunction(prop.GetType()))
{
action(prop, currentNode, objectStack);
}
// Check to see if this property holds an object we can walk into
object value;
try
{
value = prop.GetValue(currentNode);
}
catch (Exception)
{
continue;
}
if (null != value)
{
if (walkCollections && value is IEnumerable && !(value is string))
{
foreach (var obj in (IEnumerable)value)
{
WalkObjectGraph(obj, walkCollections, action, objectStack, performActionOnProperty, interestingTypeFunction);
}
}
else if (!(value is IEnumerable))
{
WalkObjectGraph(value, walkCollections, action, objectStack, performActionOnProperty, interestingTypeFunction);
}
}
}
objectStack.Pop();
}
internal static void WalkObjectGraph <TAttribute>(object source, bool intoCollections, WalkGraphAction action, Stack <object> parentObjectStack = null)
where TAttribute : Attribute
{
WalkObjectGraph(source, intoCollections, action, parentObjectStack, p => p.GetCustomAttributes <TAttribute>(true).Any(), null);
}
