创建和命名图层 （.NET）

您可以创建新图层并为这些图层指定颜色和线型属性。每个单独的图层都是图层表的一部分。使用该函数创建新图层并将其添加到“图层”表中。Add

您可以在创建图层时为其指定名称。要在创建图层后更改图层的名称，请使用属性。图层名称最多可包含 255 个字符，并包含字母、数字和特殊字符美元符号 （$）、连字符 （-） 和下划线 （_）。Name

创建一个新图层，为其指定绿色，然后将对象添加到该图层

下面的代码创建一个新的图层和圆形对象。新图层被指定为绿色。圆被分配给图层，圆的颜色也会相应更改。

Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.Geometry
Imports Autodesk.AutoCAD.Colors
 
<CommandMethod("CreateAndAssignALayer")> _
Public Sub CreateAndAssignALayer()
    '' 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 = "Center"

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

                '' Assign the layer the ACI color 3 and a name
                acLyrTblRec.Color = Color.FromColorIndex(ColorMethod.ByAci, 3)
                acLyrTblRec.Name = sLayerName

                '' 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
        End If

        '' Open the Block table for read
        Dim acBlkTbl As BlockTable
        acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, _
                                     OpenMode.ForRead)

        '' Open the Block table record Model space for write
        Dim acBlkTblRec As BlockTableRecord
        acBlkTblRec = acTrans.GetObject(acBlkTbl(BlockTableRecord.ModelSpace), _
                                        OpenMode.ForWrite)

        '' Create a circle object
        Using acCirc As Circle = New Circle()
            acCirc.Center = New Point3d(2, 2, 0)
            acCirc.Radius = 1
            acCirc.Layer = sLayerName

            acBlkTblRec.AppendEntity(acCirc)
            acTrans.AddNewlyCreatedDBObject(acCirc, True)
        End Using

        '' 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;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Colors;
 
[CommandMethod("CreateAndAssignALayer")]
public static void CreateAndAssignALayer()
{
    // 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 = "Center";

        if (acLyrTbl.Has(sLayerName) == false)
        {
            using (LayerTableRecord acLyrTblRec = new LayerTableRecord())
            {
                // Assign the layer the ACI color 3 and a name
                acLyrTblRec.Color = Color.FromColorIndex(ColorMethod.ByAci, 3);
                acLyrTblRec.Name = sLayerName;

                // 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);
            }
        }

        // Open the Block table for read
        BlockTable acBlkTbl;
        acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                                        OpenMode.ForRead) as BlockTable;

        // Open the Block table record Model space for write
        BlockTableRecord acBlkTblRec;
        acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                                        OpenMode.ForWrite) as BlockTableRecord;

        // Create a circle object
        using (Circle acCirc = new Circle())
        {
            acCirc.Center = new Point3d(2, 2, 0);
            acCirc.Radius = 1;
            acCirc.Layer = sLayerName;

            acBlkTblRec.AppendEntity(acCirc);
            acTrans.AddNewlyCreatedDBObject(acCirc, true);
        }

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

Sub CreateAssignALayer()
    ' Create a new layer and assign it the color red
    Dim layerObj As AcadLayer
    Set layerObj = ThisDrawing.Layers.Add("Center")
    layerObj.color = acRed
 
    ' Create a circle
    Dim circleObj As AcadCircle
    Dim center(0 To 2) As Double
    Dim radius As Double
    center(0) = 2: center(1) = 2: center(2) = 0
    radius = 1
    Set circleObj = ThisDrawing.ModelSpace. _
                    AddCircle(center, radius)
 
    ' Place the circle on the Center layer
    circleObj.Layer = "Center"
 
    circleObj.Update
End Sub