protected override Expression VisitProjection(ProjectionExpression projection)
{
LambdaExpression subQuery = Expression.Lambda(base.VisitProjection(projection), this.documentParameter);
Type elementType = TypeSystem.GetElementType(subQuery.Body.Type);
MethodInfo mi = miExecuteSubQuery.MakeGenericMethod(elementType);
return Expression.Convert(Expression.Call(this.documentParameter, mi, Expression.Constant(subQuery)), projection.Type);
}
protected virtual Expression VisitProjection(ProjectionExpression proj)
{
SelectExpression source = (SelectExpression)this.Visit(proj.Source);
Expression projector = this.Visit(proj.Projector);
if (source != proj.Source || projector != proj.Projector)
{
return new ProjectionExpression(source, projector);
}
return proj;
}
public ElementAtExpression(ProjectionExpression proj, Expression indexExpression)
: base(proj.Source, proj.Projector)
{
this.Index = indexExpression;
}
public CountExpression(ProjectionExpression proj)
: base(proj.Source, proj.Projector)
{
}
internal TakeExpression(ProjectionExpression proj, Expression skipAmount, Expression takeAmount)
: base(proj,skipAmount)
{
this.TakeAmount = takeAmount;
}
public SkipExpression(ProjectionExpression proj, Expression skipAmount)
: base(proj.Source, proj.Projector)
{
this.SkipAmount = skipAmount;
}
