将线型指定给图层 （.NET）

定义图层时，线型提供了另一种传达视觉信息的方式。线型是虚线、圆点和空格的重复图案，可用于区分一行和另一行的用途。

线型名称和定义描述特定的破折号-点序列、破折号和空格的相对长度，以及任何包含的文本或形状的特征。

使用 Linetype 属性可将线型分配给图层。此属性采用线型的名称作为输入。

设置图层的线型

以下示例创建一个名为“ABC”的新图层，并为其分配“Center”线型。

Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
 
<CommandMethod("SetLayerLinetype")> _
Public Sub SetLayerLinetype()
    '' Get the current document and database
    Dim acDoc As Document = Application.DocumentManager.MdiActiveDocument
    Dim acCurDb As Database = acDoc.Database

    '' Start a transaction
    Using acTrans As Transaction = acCurDb.TransactionManager.StartTransaction()

        '' Open the Layer table for read
        Dim acLyrTbl As LayerTable
        acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId, _
                                     OpenMode.ForRead)

        Dim sLayerName As String = "ABC"

        If acLyrTbl.Has(sLayerName) = False Then
            Using acLyrTblRec As LayerTableRecord = New LayerTableRecord()

                '' Assign the layer a name
                acLyrTblRec.Name = sLayerName

                '' Open the Layer table for read
                Dim acLinTbl As LinetypeTable
                acLinTbl = acTrans.GetObject(acCurDb.LinetypeTableId, _
                                             OpenMode.ForRead)

                If acLinTbl.Has("Center") = True Then
                    '' Set the linetype for the layer
                    acLyrTblRec.LinetypeObjectId = acLinTbl("Center")
                End If

                '' Upgrade the Layer table for write
                acTrans.GetObject(acCurDb.LayerTableId, OpenMode.ForWrite)

                '' Append the new layer to the Layer table and the transaction
                acLyrTbl.Add(acLyrTblRec)
                acTrans.AddNewlyCreatedDBObject(acLyrTblRec, True)
            End Using
        Else
            Dim acLyrTblRec As LayerTableRecord = acTrans.GetObject(acLyrTbl(sLayerName), _
                                                                    OpenMode.ForRead)

            '' Open the Layer table for read
            Dim acLinTbl As LinetypeTable
            acLinTbl = acTrans.GetObject(acCurDb.LinetypeTableId, _
                                         OpenMode.ForRead)

            If acLinTbl.Has("Center") = True Then
                '' Upgrade the Layer Table Record for write
                acTrans.GetObject(acLyrTbl(sLayerName), OpenMode.ForWrite)

                '' Set the linetype for the layer
                acLyrTblRec.LinetypeObjectId = acLinTbl("Center")
            End If
        End If

        '' Save the changes and dispose of the transaction
        acTrans.Commit()
    End Using
End Sub

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
 
[CommandMethod("SetLayerLinetype")]
public static void SetLayerLinetype()
{
    // Get the current document and database
    Document acDoc = Application.DocumentManager.MdiActiveDocument;
    Database acCurDb = acDoc.Database;

    // Start a transaction
    using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
    {
        // Open the Layer table for read
        LayerTable acLyrTbl;
        acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId,
                                        OpenMode.ForRead) as LayerTable;

        string sLayerName = "ABC";

        if (acLyrTbl.Has(sLayerName) == false)
        {
            using (LayerTableRecord acLyrTblRec = new LayerTableRecord())
            {
                // Assign the layer a name
                acLyrTblRec.Name = sLayerName;

                // Open the Layer table for read
                LinetypeTable acLinTbl;
                acLinTbl = acTrans.GetObject(acCurDb.LinetypeTableId,
                                                OpenMode.ForRead) as LinetypeTable;

                if (acLinTbl.Has("Center") == true)
                {
                    // Set the linetype for the layer
                    acLyrTblRec.LinetypeObjectId = acLinTbl["Center"];
                }

                // Upgrade the Layer table for write
                acTrans.GetObject(acCurDb.LayerTableId, OpenMode.ForWrite);

                // Append the new layer to the Layer table and the transaction
                acLyrTbl.Add(acLyrTblRec);
                acTrans.AddNewlyCreatedDBObject(acLyrTblRec, true);
            }
        }
        else
        {
            LayerTableRecord acLyrTblRec = acTrans.GetObject(acLyrTbl[sLayerName],
                                            OpenMode.ForRead) as LayerTableRecord;

            // Open the Layer table for read
            LinetypeTable acLinTbl;
            acLinTbl = acTrans.GetObject(acCurDb.LinetypeTableId,
                                            OpenMode.ForRead) as LinetypeTable;

            if (acLinTbl.Has("Center") == true)
            {
                // Upgrade the Layer Table Record for write
                acTrans.GetObject(acLyrTbl[sLayerName], OpenMode.ForWrite);

                // Set the linetype for the layer
                acLyrTblRec.LinetypeObjectId = acLinTbl["Center"];
            }
        }

        // Save the changes and dispose of the transaction
        acTrans.Commit();
    }
}

Sub SetLayerLinetype()
    On Error Resume Next
    Dim layerObj As AcadLayer
 
    Set layerObj = ThisDrawing.Layers.Add("ABC")
    layerObj.Linetype = "Center"
End Sub