Unable create Hatch after to Windows Form

[traiduong014969]

Hi all,

I Started work with Windonw Form. After create Hatch for a object. I begine make a form to seclect Hatch. However when i test code that has appear a message as picture below:

-moderator edit: corrected spelling errors in title.

So everyone can tell me how to fix that ?

Thank you !

 public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void B2_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void B3_Click(object sender, EventArgs e)
        {
            Document doc = AcAp.DocumentManager.MdiActiveDocument;
            Database db = doc.Database;
            string mh = B1.SelectedItem.ToString();



            try
            {
                using (Transaction trans = db.TransactionManager.StartTransaction())
                {
                    BlockTable bt = trans.GetObject(doc.Database.BlockTableId, OpenMode.ForRead) as BlockTable;
                    BlockTableRecord btr = trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;

                    Polyline pl = new Polyline();
                    pl.SetDatabaseDefaults();
                    pl.AddVertexAt(0, new Point2d(2.0, 4.0), 0, 0, 0);
                    pl.AddVertexAt(1, new Point2d(4.0, 2.0), 0, 0, 0);
                    pl.AddVertexAt(2, new Point2d(6.0, 4.0), 0, 0, 0);
                    pl.Closed = true;
                    pl.ColorIndex = 6;

                    // Add the polyline to the database
                    ObjectId plineId = btr.AppendEntity(pl);
                    trans.AddNewlyCreatedDBObject(pl, true);

                    // Create the hatch object
                    Hatch ht = new Hatch();
                    ht.SetHatchPattern(HatchPatternType.PreDefined, "mh");
                    ht.ColorIndex = 54;
                    ht.BackgroundColor = Autodesk.AutoCAD.Colors.Color.FromColorIndex(ColorMethod.ByAci, 4);

                    // Add the hatch to the database
                    btr.AppendEntity(ht);
                    trans.AddNewlyCreatedDBObject(ht, true);

                    // Set the hatch boundary
                    ht.Associative = true;
                    ht.AppendLoop(HatchLoopTypes.Default, new ObjectIdCollection() { plineId });
                    ht.EvaluateHatch(true);

                    // Add dimention
                    AlignedDimension al = new AlignedDimension();
                    AlignedDimension al1 = new AlignedDimension();
                    AlignedDimension al2 = new AlignedDimension();

                    al.XLine1Point = new Point3d(2, 4, 0);
                    al.XLine2Point = new Point3d(4, 2, 0);
                    al.Dimscale = 0.5;
                    al.DimensionStyle = db.Dimstyle;

                    al1.XLine1Point = new Point3d(4, 2, 0);
                    al1.XLine2Point = new Point3d(6, 4, 0);
                    al1.Dimscale = 0.5;
                    al1.DimensionStyle = db.Dimstyle;

                    al2.XLine1Point = new Point3d(2, 4, 0);
                    al2.XLine2Point = new Point3d(6, 4, 0);
                    al2.Dimscale = 0.5;
                    al2.DimensionStyle = db.Dimstyle;


                    // Add the new object to Model space and the transaction
                    btr.AppendEntity(al);
                    trans.AddNewlyCreatedDBObject(al, true);

                    btr.AppendEntity(al1);
                    trans.AddNewlyCreatedDBObject(al1, true);

                    btr.AppendEntity(al2);
                    trans.AddNewlyCreatedDBObject(al2, true);
                    trans.Commit();
                }
            }
            catch (Autodesk.AutoCAD.Runtime.Exception ex)
            {
                AcAp.ShowAlertDialog("not create hatch from poplyline " + ex.Message);
            }
        }

        private void B1_SelectedIndexChanged(object sender, EventArgs e)
        {
            
        }
    }

[hippe013]

It would be helpful if you posted your code in its entirety. How are you launching your dialog? Modal? Modeless? Without seeing the rest of your code I have to just guess. At first glance the problem appears to be that you are not locking your document. 

Using DocumentLock docLock = doc.LockDocument {
   Using Transaction trans = db.TransactionManager.StartTransaction {

   }
}

[hosneyalaa]

Hi

I think you are needing

a LockDocument() method.

And change

// Add the polyline to the database
                   btr.AppendEntity(pl);
                    trans.AddNewlyCreatedDBObject(pl, true);

And  can you see this

https://forums.autodesk.com/t5/net/draw-polyline-with-hatch-getting-error-einvalidinput/m-p/9632916

[traiduong014969]

When i replace Text "mh" by "ANSI31" or specific name. Code woking, but i replace by a variable. It will appear a error.

[traiduong014969]

It's seem that has an error when i add DoccumentLock

[Ed__Jobe]

"not create hatch from poplyline " should be "Hatch not created from polyline". Polyline only has 1 "p".

[hosneyalaa]

What It is in the error message

add DoccumentLock 

As @hippe013  write 

[traiduong014969 · Accepted solution]

This mistake is add apostrophes into "mh"

ht.SetHatchPattern(HatchPatternType.PreDefined, "mh");

code after fixed

ht.SetHatchPattern(HatchPatternType.PreDefined, mh);