Specify Multiple Criteria in a Selection Filter (.NET)

A selection filter can contain filtering criteria for more than just one property or object. You define the total number of conditions to filter on by declaring an array containing enough elements to represent each of the filter criterion.

Select objects that meet three criterion

The following example specifies three criterion to filter selected objects by: the object must be a circle, is blue in color, and must reside on layer 0.

VB.NET

Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.EditorInput
 
<CommandMethod("FilterBlueCircleOnLayer0")> _
Public Sub FilterBlueCircleOnLayer0()
    '' Get the current document editor
    Dim acDocEd As Editor = Application.DocumentManager.MdiActiveDocument.Editor

    '' Create a TypedValue array to define the filter criteria
    Dim acTypValAr(2) As TypedValue
    acTypValAr.SetValue(New TypedValue(DxfCode.Color, 5), 0)
    acTypValAr.SetValue(New TypedValue(DxfCode.Start, "CIRCLE"), 1)
    acTypValAr.SetValue(New TypedValue(DxfCode.LayerName, "0"), 2)

    '' Assign the filter criteria to a SelectionFilter object
    Dim acSelFtr As SelectionFilter = New SelectionFilter(acTypValAr)

    '' Request for objects to be selected in the drawing area
    Dim acSSPrompt As PromptSelectionResult
    acSSPrompt = acDocEd.GetSelection(acSelFtr)

    '' If the prompt status is OK, objects were selected
    If acSSPrompt.Status = PromptStatus.OK Then
        Dim acSSet As SelectionSet = acSSPrompt.Value

        Application.ShowAlertDialog("Number of objects selected: " & _
                                    acSSet.Count.ToString())
    Else
        Application.ShowAlertDialog("Number of objects selected: 0")
    End If
End Sub

C#

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
 
[CommandMethod("FilterBlueCircleOnLayer0")]
public static void FilterBlueCircleOnLayer0()
{
    // Get the current document editor
    Editor acDocEd = Application.DocumentManager.MdiActiveDocument.Editor;

    // Create a TypedValue array to define the filter criteria
    TypedValue[] acTypValAr = new TypedValue[3];
    acTypValAr.SetValue(new TypedValue((int)DxfCode.Color, 5), 0);
    acTypValAr.SetValue(new TypedValue((int)DxfCode.Start, "CIRCLE"), 1);
    acTypValAr.SetValue(new TypedValue((int)DxfCode.LayerName, "0"), 2);

    // Assign the filter criteria to a SelectionFilter object
    SelectionFilter acSelFtr = new SelectionFilter(acTypValAr);

    // Request for objects to be selected in the drawing area
    PromptSelectionResult acSSPrompt;
    acSSPrompt = acDocEd.GetSelection(acSelFtr);

    // If the prompt status is OK, objects were selected
    if (acSSPrompt.Status == PromptStatus.OK)
    {
        SelectionSet acSSet = acSSPrompt.Value;

        Application.ShowAlertDialog("Number of objects selected: " +
                                    acSSet.Count.ToString());
    }
    else
    {
        Application.ShowAlertDialog("Number of objects selected: 0");
    }
}

VBA/ActiveX Code Reference

Sub FilterBlueCircleOnLayer0()
    Dim sset As AcadSelectionSet
    Set sset = ThisDrawing.SelectionSets.Add("SS1")
 
    ' Define the filter list, only blue Circle objects
    ' on layer 0
    Dim FilterType(2) As Integer
    Dim FilterData(2) As Variant
 
    FilterType(0) = 62: FilterData(0) = 5
    FilterType(1) = 0: FilterData(1) = "Circle"
    FilterType(2) = 8: FilterData(2) = "0"
 
    ' Prompt the user to select objects
    ' and add them to the selection set
    sset.SelectOnScreen FilterType, FilterData
 
    MsgBox "Number of objects selected: " & sset.Count
 
    ' Remove the selection set at the end
    sset.Delete
End Sub