Yes it is possible use .NET LINQ (Language-Integrated Query) features with Civil 3D ActiveX objects, this Microsoft technology consists in a set of extensions to .NET languages and supporting libraries that allow users to formulate queries within the programming language itself.
We can use it for a Civil 3D ActiveX collection like points, the following code sample demonstrate it. It can also be used for .NET collections in a similar way, but the new Point .NET API on Civil 3D 2013 have better features.
private Autodesk.AECC.Interop.UiLand.AeccApplication aeccApp;
private Autodesk.AECC.Interop.UiLand.AeccDocument aeccDoc;
private Autodesk.AECC.Interop.Land.AeccDatabase aeccDb;
//Get Civil 3D objects
public void getCivilObjects()
{
AcadApplication oApp = (AcadApplication)
Application.AcadApplication;
string sAppName = "AeccXUiLand.AeccApplication.9.0";
aeccApp = (AeccApplication)oApp.GetInterfaceObject(sAppName);
aeccDoc = (AeccDocument)aeccApp.ActiveDocument;
aeccDb = (AeccDatabase)aeccDoc.Database;
}
//release Civil 3D objects
public void releaseCivilObjects()
{
Marshal.ReleaseComObject(aeccDb);
Marshal.ReleaseComObject(aeccDoc);
Marshal.ReleaseComObject(aeccApp);
}
public AeccPoint[] findPoints(double easting, double northing, double tolerance)
{
var pointLinqSearch = from AeccPoint pto in aeccDb.Points
where
//easting with tolerance
(pto.Easting >= easting – tolerance &&
pto.Easting <= easting + tolerance) &&
//northing with tolerance
(pto.Northing >= northing – tolerance &&
pto.Northing <= northing + tolerance)
select pto;
return pointLinqSearch.ToArray();
}
[CommandMethod("findpto")]
public void testFindPoint()
{
getCivilObjects();
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
double easting, northing, tolerance;
easting = northing = tolerance = 0.0;
for (int i = 0; i < 3; i++)
{
PromptDoubleResult pdr = null;
PromptDoubleOptions o;
switch (i)
{
case 0: pdr = ed.GetDouble("Enter easting: "); break;
case 1: pdr = ed.GetDouble("Enter northing: "); break;
case 2: pdr = ed.GetDouble("Enter tolerance: "); break;
}
if (pdr.Status != PromptStatus.OK) return;
switch (i)
{
case 0: easting = pdr.Value; break;
case 1: northing = pdr.Value; break;
case 2: tolerance = pdr.Value; break;
}
}
AeccPoint[] ptos = findPoints(easting, northing, tolerance);
foreach (AeccPoint pto in ptos)
{
pto.Highlight(true);
}
releaseCivilObjects();
}
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