protected override Expression VisitNewExpression(NewExpression expression)
{
if (expression.CanReduce)
{
return(expression.Reduce());
}
int len = expression.Arguments.Count;
for (int i = 0; i < len; i++)
{
var arg = expression.Arguments[i];
var memb = expression.Members[i];
VisitExpression(arg);
var last = Query.Selects[Query.Selects.Count - 1];
if (last.Name != memb.Name && !last.Sql.Contains(" AS "))
{
last.Name = memb.Name;
if (!Query.CanQueryInMemory)
{
last.Sql += " AS \"{0}\"".With(memb.Name);
}
}
}
return(Expression.New(expression.Constructor, expression.Arguments));
}
public override Expression Reduce()
{
var reducedNewExpression = NewExpression.Reduce();
if (reducedNewExpression.NodeType == ExpressionType.New)
{
return(MemberInit(
(NewExpression)reducedNewExpression,
from i in Enumerable.Range(0, Arguments.Count)
let a = Arguments[i]
let m = WritableMembers[i]
select Bind(m, a)));
}
else
{
var variable = Variable(reducedNewExpression.Type, "instance");
var expressions = new Expression[Arguments.Count + 2];
expressions[0] = Assign(variable, reducedNewExpression);
for (var i = 0; i < Arguments.Count; i++)
{
expressions[i + 1] = Assign(MakeMemberAccess(variable, WritableMembers[i]), Arguments[i]);
}
expressions[Arguments.Count + 1] = Convert(variable, Type);
return(Block(new[] { variable }, expressions));
}
}
protected override Expression VisitNewExpression(NewExpression expression)
{
if (expression.CanReduce)
{
return(expression.Reduce());
}
foreach (var arg in expression.Arguments)
{
VisitExpression(arg);
}
return(Expression.New(expression.Constructor, expression.Arguments));
}