/// <summary>
/// Gets diff of two property containers.
/// </summary>
public static ObjectDiff GetDiff(
IPropertyContainer container1,
IPropertyContainer container2,
Func <IPropertyValue, string>?renderValue = null,
bool compareByRenderedValues = false,
SearchOptions?searchOptions = null)
{
renderValue ??= FormatForDiff;
var search = searchOptions ?? Search.ExistingOnlyWithParent.WithPropertyComparer(PropertyComparer.ByTypeAndNameComparer);
IEnumerable <(IPropertyValue?PropertyValue1, IPropertyValue PropertyValue2)> propertyPairs =
container2
.Properties
.Select(propertyValue2 => (container1.GetPropertyValueUntyped(propertyValue2.PropertyUntyped, search), propertyValue2));
IEnumerable <(IPropertyValue PropertyValue1, IPropertyValue?PropertyValue2)> removedPropertyPairs =
container1
.Properties
.Select(propertyValue1 => (propertyValue1, container2.GetPropertyValueUntyped(propertyValue1.PropertyUntyped, search)))
.Where(tuple => tuple.Item2 == null);
var propertyPairsAll = propertyPairs.Concat(removedPropertyPairs);
PropertyDiff[]? diffPairs;
if (compareByRenderedValues)
{
diffPairs = propertyPairsAll
.Select(propertyPair => PropertyDiff(propertyPair))
.Where(diff => !Equals(diff.NewValue, diff.OldValue))
.ToArray();
}
else
{
diffPairs = propertyPairsAll
.Where(propertyPair => !EqualsForDiff(propertyPair.PropertyValue1?.ValueUntyped, propertyPair.PropertyValue2?.ValueUntyped))
.Select(propertyPair => PropertyDiff(propertyPair))
.ToArray();
}
PropertyDiff PropertyDiff((IPropertyValue? PropertyValue1, IPropertyValue? PropertyValue2) valueTuple)
{
string propertyName = (valueTuple.PropertyValue1?.PropertyUntyped.Name ?? valueTuple.PropertyValue2?.PropertyUntyped.Name) !;
return(new PropertyDiff(
propertyName,
valueTuple.PropertyValue1 != null ? renderValue(valueTuple.PropertyValue1) : null,
valueTuple.PropertyValue2 != null? renderValue(valueTuple.PropertyValue2) : null));
}
return(new ObjectDiff(diffPairs));
}
/// <inheritdoc />
public override bool TryGetMember(GetMemberBinder binder, [MaybeNullWhen(true)] out object result)
{
var propertyValue = _propertyContainer.GetPropertyValueUntyped(Search
.ByNameOrAlias(binder.Name, _ignoreCase)
.SearchInParent(_searchInParent)
.ReturnNull());
if (propertyValue != null)
{
result = propertyValue.ValueUntyped;
return(true);
}
// returns null if property was not found.
result = null;
return(true);
}
