冻结和解冻层 （.NET）

您可以冻结图层以加快显示更改速度、提高对象选择性能并缩短复杂图形的再生时间。AutoCAD 不会在冻结图层上显示、打印或重新生成对象。冻结您不会长时间使用的图层。“解冻”冻结图层时，AutoCAD 将重新生成并显示该图层上的对象。

使用该属性冻结或解冻图层。如果输入值 ，则图层将被冻结。如果输入值 ，则图层将解冻。IsFrozenTRUEFALSE

冻结图层

本示例创建一个名为“ABC”的新图层，然后冻结该图层。

Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
 
<CommandMethod("FreezeLayer")> _
Public Sub FreezeLayer()
    '' 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

                '' Freeze the layer
                acLyrTblRec.IsFrozen = True

                '' 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.ForWrite)

            '' Freeze the layer
            acLyrTblRec.IsFrozen = True
        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("FreezeLayer")]
public static void FreezeLayer()
{
    // 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;

                // Freeze the layer
                acLyrTblRec.IsFrozen = true;

                // 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.ForWrite) as LayerTableRecord;

            // Freeze the layer
            acLyrTblRec.IsFrozen = true;
        }

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

Sub FreezeLayer()
    ' Create a new layer called "ABC"
    Dim layerObj As AcadLayer
    Set layerObj = ThisDrawing.Layers.Add("ABC")
 
    ' Freeze layer "ABC"
    layerObj.Freeze = True
End Sub