private void BuildCollectionHashing(List <Expression> expressions,
List <ParameterExpression> variables,
MemberExpression collMember,
ParameterExpression hashVariable,
Type itemType,
int prime2)
{
var colhashVar = Expression.Parameter(typeof(int));
var currentItem = Expression.Parameter(itemType);
variables.Add(colhashVar);
expressions.Add(Expression.Assign(colhashVar, Expression.Constant(_configuration.ColPrime1, typeof(int))));
expressions.Add(Expression.IfThen(
Expression.NotEqual(
collMember,
Expression.Default(collMember.Type)
),
collMember.ForEach(currentItem,
BuildItemHashing(currentItem, itemType, colhashVar, _configuration.ColPrime2)
)
));
expressions.Add(Expression.Assign(
hashVariable,
Expression.ExclusiveOr(
Expression.Multiply(
hashVariable,
Expression.Constant(prime2, typeof(int))
),
colhashVar
)
));
}
