declare an array of a Point3d type in C# and resize it

[rashil]

Can somebody help me here? I'm very new to C#.

using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.Interop;

namespace AutoCADProfileStationing
{
    public class Commands
    {
        [CommandMethod("ACADbatch")]
        static public void Main(string[] args)
        {

            OpenFileDialog fdlg = new OpenFileDialog();
            fdlg.Title = "C# Corner Open File Dialog";
            fdlg.InitialDirectory = @"c:\";
            fdlg.Filter = "AutoCAD .dwg files (*.dwg*)|*.dwg*";
            fdlg.FilterIndex = 1;
            fdlg.RestoreDirectory = true;
            fdlg.Multiselect = true;
            if (fdlg.ShowDialog() == DialogResult.OK)
            {

                foreach (string fName in fdlg.FileNames)

                {
                    Database db = new Database(false, true);
                    using (db)
                    {
                        try
                        {
                            db.ReadDwgFile(
                                fName,
                                FileShare.ReadWrite,
                                false,
                                ""
                                );
                        }
                        catch (System.Exception)
                        {
                            return;
                        }

                        Transaction tr =
                            db.TransactionManager.StartTransaction();
                        using (tr)
                        {
                            DBDictionary layoutDict = (DBDictionary)tr.GetObject(db.LayoutDictionaryId, OpenMode.ForWrite);

                            foreach (DBDictionaryEntry entry in layoutDict)
                            {
                                if (entry.Key != "Model")
                                {
                                    Layout layout = (Layout)tr.GetObject(entry.Value, OpenMode.ForWrite);
                                    BlockTableRecord layoutBtr = (BlockTableRecord)tr.GetObject(layout.BlockTableRecordId, OpenMode.ForWrite, false);
                                    if (!layoutBtr.IsAnonymous)
                                    {
                                        int count = 0;
                                        Line[] callLines = null;
                                        Polyline2d profile = null;
                                        Polyline2d pipeProfile = null;
                                        MLeader myMLeader = null;
                                        MLeader ngMLeader = null;
                                        MLeader topMLeader = null;
                                        int textCount = 0;
                                        DBText[] callText = null;
                                        Point3dCollection pts = new Point3dCollection();


                                        foreach (ObjectId id in layoutBtr)
                                        {
                                            Entity ent = (Entity)tr.GetObject(id, OpenMode.ForWrite);
                                            Line myLine = ent as Line;
                                            if (myLine != null)
                                            {
                                                if (myLine.Layer == "Profile_Feature")
                                                {
                                                    count = count + 1;
                                                    callLines[count] = myLine;
                                                }
                                            }
                                            Polyline2d myPLine = ent as Polyline2d;
                                            if (myPLine != null)
                                            {
                                                if (myPLine.Layer == "Profile_Natural Gnd Line")
                                                {
                                                    profile = myPLine;
                                                }
                                                else if (myPLine.Layer == "Profile_As-Built")
                                                {
                                                    pipeProfile = myPLine;
                                                }
                                            }
                                            MLeader tempLeader = ent as MLeader;
                                            if (tempLeader != null)
                                            {
                                                if (tempLeader.Layer == "Text_Profile"
                                                    && tempLeader.MText.Text == @"{\C1;5' COV.}"
                                                    && tempLeader.GetVertex(0, 0).X < 250)
                                                {
                                                    myMLeader = tempLeader;
                                                }
                                                else if (tempLeader.Layer == "Text_Profile"
                                                    && tempLeader.MText.Text == @"{\C1;NATURAL GROUND}"
                                                    && tempLeader.GetVertex(0, 0).X < 250)
                                                {
                                                    ngMLeader = tempLeader;
                                                }
                                                else if (tempLeader.Layer == "Text_Profile"
                                                    && tempLeader.MText.Text == @"{\C1;AS-BUILT T.O.P.\P20"" NGL PIPELINE}"
                                                    && tempLeader.GetVertex(0, 0).X < 250)
                                                {
                                                    topMLeader = tempLeader;
                                                }
                                            }
                                            DBText myText = ent as DBText;
                                            if (myText != null)
                                            {
                                                textCount = textCount + 1;
                                                callText[textCount] = myText;
                                            }
                                        }

                                        Point3d profileMid;
                                        Point3d pipeProfileMid;

                                        profileMid = profile.GetPointAtDist(profile.Length / 2);
                                        pipeProfileMid = pipeProfile.GetPointAtDist(pipeProfile.Length / 2);
                                        Point3d[] intPoint = new Point3d[callLines.Count()];

                                        try
                                        {
                                            for (int i = 1; i < callLines.Length +1 ; i++)
                                            {
                                                intPoint[i] = callLines[i].IntersectWith(profile, Intersect.ExtendThis, pts, IntPtr.Zero, IntPtr.Zero);
                                            }
                                        }

                                        catch (System.Exception)
                                        {
                                            return;
                                        }

                                    }
                                }
                            }
                        }
                    }
                }
            }
        }


    }
}

[fieldguy]

There are several examples on this forum that use Point3DCollection.

[cdinten]

Using Point3dCollection is more convenient than array,it's resized dynamicly according to the number of elements.

[rashil]

In my code I also need to create a dynamic array or line and text elements. I think that the way I have done this is incorrect. What is the best way to create such an array?

[rashil]

Why am I getting an error on this line:

                                                intPoint.Add(callLines.ElementAt(i).IntersectWith(profile, Intersect.ExtendThis, pts, IntPtr.Zero, IntPtr.Zero));
                                                intPoint2.Add(callLines.ElementAt(i).IntersectWith(pipeProfile, Intersect.ExtendThis, pts, IntPtr.Zero, IntPtr.Zero));

Error 1 The best overloaded method match for 'System.Collections.Generic.List<Autodesk.AutoCAD.Geometry.Point3d>.Add(Autodesk.AutoCAD.Geometry.Point3d)' has some invalid arguments \\willbros.local\wei\users\rashil\My Documents\Visual Studio 2010\Projects\AutoCADProfileStationing\AutoCADProfileStationing\Class1.cs 141 49 AutoCADProfileStationing

Error 2 Argument 1: cannot convert from 'void' to 'Autodesk.AutoCAD.Geometry.Point3d' \\willbros.local\wei\users\rashil\My Documents\Visual Studio 2010\Projects\AutoCADProfileStationing\AutoCADProfileStationing\Class1.cs 141 63 AutoCADProfileStationing

Here is the entire code thus far:

using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.Interop;

namespace AutoCADProfileStationing
{
    public class Commands
    {
        [CommandMethod("ACADbatch")]
        static public void Main(string[] args)
        {

            OpenFileDialog fdlg = new OpenFileDialog();
            fdlg.Title = "C# Corner Open File Dialog";
            fdlg.InitialDirectory = @"c:\";
            fdlg.Filter = "AutoCAD .dwg files (*.dwg*)|*.dwg*";
            fdlg.FilterIndex = 1;
            fdlg.RestoreDirectory = true;
            fdlg.Multiselect = true;
            if (fdlg.ShowDialog() == DialogResult.OK)
            {

                foreach (string fName in fdlg.FileNames)

                {
                    Database db = new Database(false, true);
                    using (db)
                    {
                        try
                        {
                            db.ReadDwgFile(
                                fName,
                                FileShare.ReadWrite,
                                false,
                                ""
                                );
                        }
                        catch (System.Exception)
                        {
                            return;
                        }

                        Transaction tr =
                            db.TransactionManager.StartTransaction();
                        using (tr)
                        {
                            DBDictionary layoutDict = (DBDictionary)tr.GetObject(db.LayoutDictionaryId, OpenMode.ForWrite);

                            foreach (DBDictionaryEntry entry in layoutDict)
                            {
                                if (entry.Key != "Model")
                                {
                                    Layout layout = (Layout)tr.GetObject(entry.Value, OpenMode.ForWrite);
                                    BlockTableRecord layoutBtr = (BlockTableRecord)tr.GetObject(layout.BlockTableRecordId, OpenMode.ForWrite, false);
                                    if (!layoutBtr.IsAnonymous)
                                    {
                                        List<Line> callLines = new List<Line>();
                                        Polyline2d profile = null;
                                        Polyline2d pipeProfile = null;
                                        MLeader myMLeader = null;
                                        MLeader ngMLeader = null;
                                        MLeader topMLeader = null;
                                        List<DBText> callText = new List<DBText>();
                                        Point3dCollection pts = new Point3dCollection();
                                        
                                        
                                        foreach (ObjectId id in layoutBtr)
                                        {
                                            Entity ent = (Entity)tr.GetObject(id, OpenMode.ForWrite);
                                            Line myLine = ent as Line;
                                            if (myLine != null)
                                            {
                                                if (myLine.Layer == "Profile_Feature")
                                                {
                                                    callLines.Add(myLine);
                                                }
                                            }
                                            Polyline2d myPLine = ent as Polyline2d;
                                            if (myPLine != null)
                                            {
                                                if (myPLine.Layer == "Profile_Natural Gnd Line")
                                                {
                                                    profile = myPLine;
                                                }
                                                else if (myPLine.Layer == "Profile_As-Built")
                                                {
                                                    pipeProfile = myPLine;
                                                }
                                            }
                                            MLeader tempLeader = ent as MLeader;
                                            if (tempLeader != null)
                                            {
                                                if (tempLeader.Layer == "Text_Profile"
                                                    && tempLeader.MText.Text == @"{\C1;5' COV.}"
                                                    && tempLeader.GetVertex(0, 0).X < 250)
                                                {
                                                    myMLeader = tempLeader;
                                                }
                                                else if (tempLeader.Layer == "Text_Profile"
                                                    && tempLeader.MText.Text == @"{\C1;NATURAL GROUND}"
                                                    && tempLeader.GetVertex(0, 0).X < 250)
                                                {
                                                    ngMLeader = tempLeader;
                                                }
                                                else if (tempLeader.Layer == "Text_Profile"
                                                    && tempLeader.MText.Text == @"{\C1;AS-BUILT T.O.P.\P20"" NGL PIPELINE}"
                                                    && tempLeader.GetVertex(0, 0).X < 250)
                                                {
                                                    topMLeader = tempLeader;
                                                }
                                            }
                                            DBText myText = ent as DBText;
                                            if (myText != null)
                                            {
                                                callText.Add(myText);
                                            }
                                        }

                                        Point3d profileMid;
                                        Point3d pipeProfileMid;

                                        profileMid = profile.GetPointAtDist(profile.Length / 2);
                                        pipeProfileMid = pipeProfile.GetPointAtDist(pipeProfile.Length / 2);
                                        List<Point3d> intPoint = null;
                                        List<Point3d> intPoint2 = null;

                                        try
                                        {
                                            for (int i = 0; i < callLines.Count ; i++)
                                            {
                                                intPoint.Add(callLines.ElementAt(i).IntersectWith(profile, Intersect.ExtendThis, pts, IntPtr.Zero, IntPtr.Zero));
                                                intPoint2.Add(callLines.ElementAt(i).IntersectWith(pipeProfile, Intersect.ExtendThis, pts, IntPtr.Zero, IntPtr.Zero));
                                            }
                                        }

                                        catch (System.Exception)
                                        {
                                            return;
                                        }

                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

[hgasty1001]

Hi,

Not sure what type of "array" you need as i don't know exactly what are you trying to do, I think that a little browsing on System.Collection.Generic namespace should help you to choose what kind of structure to use: Collections

Gaston Nunez

[Hallex]

Try instead:
((Point3d)callLines.ElementAt(i)).IntersectWith..etc
same with other points

[rashil]

This does not help, code returns same error.

[jeff]

List<Point3d> intPoint = null;

Your not going to have much luck using a variable that points to nothing.

List<Point3d> intPoint = new List<Point3D>();

new will create a List<Point3d> object and set inpoint to reference it.

Not sure where you can find a "dynamic" array assuming the items are sequential in memory, and would need to know how much memory to allocate.

A List<T> uses an array under the hood and once the array fills up it creates a new one twice as big and copies items over.