bool DoLast()
{
if (Last <= 0)
{
return(false);
}
Skip = (int)(TargetCollection.Count(_Query) - Skip - Last);
First = Last;
if (Skip >= 0)
{
return(false);
}
First += Skip;
if (First <= 0)
{
if (Count)
{
WriteObject(0);
}
return(true);
}
Skip = 0;
return(false);
}
protected override void BeginProcessing()
{
if (First > 0 && Last > 0)
{
throw new PSArgumentException("Parameters First and Last cannot be specified together.");
}
try
{
switch (ParameterSetName)
{
case nsCount:
if (First > 0 || Skip > 0 || Last > 0)
{
break;
}
WriteObject(TargetCollection.Count(_Query));
return;
case nsDistinct:
DoDistinct();
return;
case nsRemove:
DoRemove();
return;
case nsUpdate:
DoUpdate();
return;
}
// Last -> First and Skip
if (DoLast())
{
return;
}
// Count
if (Count)
{
WriteObject(TargetCollection.Count(_Query, Skip, First));
return;
}
//_131018_160000 Do not use WriteObject(.., true), that seems to take a lot more memory
foreach (var document in TargetCollection.FindAs(DocumentType, _Query, Modes, _SortBy, Skip, First, _Fields))
{
WriteObject(document);
}
}
catch (MongoException ex)
{
WriteException(ex, null);
}
}