private static MemberAssignment BindMappedTypeExpression(IConfigurationProvider configuration, PropertyMap propertyMap, ExpressionRequest request, ExpressionResolutionResult result, IDictionary <ExpressionRequest, int> typePairCount, LetPropertyMaps letPropertyMaps)
{
var transformedExpression = configuration.ExpressionBuilder.CreateMapExpression(request, result.ResolutionExpression, typePairCount, letPropertyMaps);
if (transformedExpression == null)
{
return(null);
}
// Handles null source property so it will not create an object with possible non-nullable properties which would result in an exception.
if (propertyMap.AllowsNullDestinationValues() && !(result.ResolutionExpression is ParameterExpression) && !result.ResolutionExpression.Type.IsCollectionType())
{
transformedExpression = result.ResolutionExpression.IfNullElse(Constant(null, transformedExpression.Type), transformedExpression);
}
return(Bind(propertyMap.DestinationMember, transformedExpression));
}