cs
public static class 图层助手
{
/// <summary>
/// 将模型空间所有实体的图层修改为当前文档的当前图层
/// </summary>
/// <param name="doc">当前文档对象</param>
/// <param name="editor">CAD编辑器对象（用于输出提示信息）</param>
/// <returns>成功修改的实体数量</returns>
public static int 改所有实体到当前图层(Document doc, Editor editor)
{
int modifiedCount = 0;
string currentLayer = ""; // 当前图层名称
// 1. 获取当前图层名称（关键：从文档获取当前活动图层）
try
{
//object clayerValue = doc.Database.Clayer;
object clayerValue = Application.GetSystemVariable("CLAYER");
currentLayer = clayerValue.ToString();
if (string.IsNullOrEmpty(currentLayer))
{
currentLayer = "0"; // 默认图层名称
}
}
catch (Exception ex)
{
}
if (string.IsNullOrEmpty(currentLayer))
{
currentLayer = "0"; // 默认图层名称
}
using (Transaction trans = doc.TransactionManager.StartTransaction())
{
try
{
// 2. 打开模型空间块表记录（写模式，因为需要修改实体）
BlockTable blockTable = trans.GetObject(
doc.Database.BlockTableId, OpenMode.ForRead
) as BlockTable;
BlockTableRecord modelSpace = trans.GetObject(
blockTable[BlockTableRecord.ModelSpace], OpenMode.ForWrite
) as BlockTableRecord;
// 3. 遍历模型空间所有实体ID
foreach (ObjectId entityId in modelSpace)
{
Entity entity = trans.GetObject(entityId, OpenMode.ForWrite) as Entity;
if (entity == null || entity.IsErased) continue; // 跳过无效实体
// 4. 执行图层修改（仅当当前图层不同时操作）
if (entity.Layer != currentLayer)
{
entity.Layer = currentLayer; // 直接赋值图层名称
modifiedCount++;
}
entity.Dispose(); // 显式释放实体（虽然事务结束会自动释放，但显式调用更安全）
}
trans.Commit(); // 提交事务
// editor.WriteMessage($"\n成功修改 {modifiedCount} 个实体的图层到【{currentLayer}】");
}
catch (System.Exception ex)
{
trans.Abort(); // 异常时回滚事务
//editor.WriteMessage($"\n批量改图层失败：{ex.Message}");
}
}
return modifiedCount;
}
public static string 获取当前层(this Database db)
{
Document doc = Application.DocumentManager.MdiActiveDocument;
string currentLayer = ""; // 当前图层名称
// 1. 获取当前图层名称（关键：从文档获取当前活动图层）
try
{
//object clayerValue = doc.Database.Clayer;
object clayerValue = Application.GetSystemVariable("CLAYER");
currentLayer = clayerValue.ToString();
if (string.IsNullOrEmpty(currentLayer))
{
currentLayer = "0"; // 默认图层名称
}
}
catch (Exception ex)
{
}
if (string.IsNullOrEmpty(currentLayer))
{
currentLayer = "0"; // 默认图层名称
}
return currentLayer;
#region
//using (Transaction trans = doc.TransactionManager.StartTransaction())
//{
// try
// {
// // 2. 打开模型空间块表记录（写模式，因为需要修改实体）
// BlockTable blockTable = trans.GetObject(
// doc.Database.BlockTableId, OpenMode.ForRead
// ) as BlockTable;
// BlockTableRecord modelSpace = trans.GetObject(
// blockTable[BlockTableRecord.ModelSpace], OpenMode.ForWrite
// ) as BlockTableRecord;
// // 3. 遍历list实体ID
// ents.ForEach(ent =>
// {
// ent.Layer = currentLayer;
// }); // 直接赋值图层名称
// trans.Commit(); // 提交事务
// // editor.WriteMessage($"\n成功修改 {modifiedCount} 个实体的图层到【{currentLayer}】");
// }
// catch (System.Exception ex)
// {
// trans.Abort(); // 异常时回滚事务
// //editor.WriteMessage($"\n批量改图层失败：{ex.Message}");
// }
//}
#endregion
}
/// <summary>
/// 获取指定图层的颜色索引
/// </summary>
/// <param name="layerName">目标图层名称</param>
/// <returns>图层的颜色索引（若不存在返回-1）</returns>
public static int 获取图层颜色(this string layerName )
{
// 获取当前文档和数据库
Document doc = Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
// 使用事务保证数据库操作安全
using (Transaction tr = db.TransactionManager.StartTransaction())
{
try
{
// 打开图层表（只读模式）
LayerTable layerTable = tr.GetObject(
db.LayerTableId,
OpenMode.ForRead
) as LayerTable;
// 检查图层是否存在
if (!layerTable.Has(layerName))
{
return 0; // 返回表示图层不存在
}
// 获取图层记录（只读模式）
ObjectId layerId = layerTable[layerName];
LayerTableRecord layer = tr.GetObject(
layerId,
OpenMode.ForRead
) as LayerTableRecord;
// 返回颜色索引
return layer.Color.ColorIndex;
}
finally
{
tr.Commit(); // 提交事务（只读操作仍需要提交）
}
}
}
}
cs
public static class 图层助手1
{
public static void SetCurrentLayer(this Database db, Entity ent)
{
if (db == null||ent is null||ent.IsErased) return;
try
{
using (Transaction tr = db.TransactionManager.StartTransaction())
{
var getent = tr.GetObject(ent.ObjectId, OpenMode.ForWrite) as Entity;
//LayerTable layerTable = tr.GetObject(db.LayerTableId, OpenMode.ForRead) as LayerTable;
//var ltr = tr.GetObject(db.Clayer, OpenMode.ForRead) as LayerTableRecord;
//ent.Layer = ltr.Name;
getent.LayerId = db.Clayer;
tr.Commit();
}
}
catch (Exception ex)
{
Z.WriteEX(ex);
}
}
/// <summary>
/// 将指定的图层设置为当前层
/// </summary>
/// <param name="db">数据库对象</param>
/// <param name="layerName">图层名</param>
/// <returns>如果设置成功，则返回ture</returns>
public static bool SetCurrentLayer(this Database db, string layerName)
{
#region 前置校验（避免非法输入）
if (string.IsNullOrEmpty(layerName))
return false; // 图层名不能为空
// 检查图层名是否包含AutoCAD禁止的特殊字符（如<、>、:等）
if (layerName.IndexOfAny(new[] { '<', '>', ':', '"', '/', '\\', '|', '?', '*' }) != -1)
return false;
#endregion
// 获取当前文档（确保在AutoCAD界面中运行）
Document doc = Application.DocumentManager.MdiActiveDocument;
if (doc == null) return false;
// 启动事务（关键！保证数据库操作的原子性）
using (Transaction tr = db.TransactionManager.StartTransaction())
{
try
{
#region 步骤1：获取图层表（LayerTable）
// 以读模式打开图层表（所有图层的容器）
LayerTable lt = tr.GetObject(db.LayerTableId, OpenMode.ForRead) as LayerTable;
if (lt == null) return false; // 图层表获取失败
#endregion
#region 步骤2：检查图层是否存在
if (!lt.Has(layerName))
return false; // 图层不存在
#endregion
#region 步骤3：获取目标图层ID
ObjectId targetLayerId = lt[layerName];
#endregion
#region 步骤4：判断是否已为当前图层（避免重复设置）
// 使用 LayerManager 获取当前图层ID（新版本推荐方式）
if (db.Clayer == targetLayerId)
return false; // 已是当前图层
#endregion
#region 步骤5：设置当前图层（新版本推荐方式）
db.Clayer = targetLayerId;
#endregion
tr.Commit(); // 提交事务（所有操作生效）
return true;
}
catch (Exception ex)
{
tr.Abort(); // 异常时回滚事务
doc.Editor.WriteMessage($"\n设置当前图层失败：{ex.Message}");
return false;
}
}
}
public static string SetLayer(this Database db, Entity ent, string layname)
{
if (ent.Layer == layname) return layname;
// Database db = HostApplicationServices.WorkingDatabase;
Document mdiActiveDocument = Application.DocumentManager.MdiActiveDocument;
using (Transaction transaction = db.TransactionManager.StartTransaction())
{
LayerTable layerTable = transaction.GetObject(db.LayerTableId, OpenMode.ForRead) as LayerTable;
if (!layerTable.Has(layname))
{
LayerTableRecord layerTableRecord = new LayerTableRecord();
layerTableRecord.Color = Color.FromColorIndex(ColorMethod.ByAci, 0);
layerTableRecord.Name = layname;
layerTable.UpgradeOpen();
layerTable.Add(layerTableRecord);
transaction.AddNewlyCreatedDBObject(layerTableRecord, add: true);
}
//// 以只读方式打开块表 Open the Block table for read
//BlockTable acBlkTbl = transaction.GetObject(db.BlockTableId,
// OpenMode.ForRead) as BlockTable;
//// 以写方式打开模型空间块表记录 Open the Block table record Model space for write
//BlockTableRecord acBlkTblRec = transaction.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
// OpenMode.ForWrite) as BlockTableRecord;
//// 设置图层
Entity entInTrans = transaction.GetObject(ent.ObjectId, OpenMode.ForWrite) as Entity;
entInTrans.Layer = layname;
////acBlkTblRec.AppendEntity(ent);
//transaction.AddNewlyCreatedDBObject(ent, true);
// Save the changes and dispose of the transaction
transaction.Commit();
}
return layname;
}
/// <summary>
/// 添加图层
/// </summary>
/// <param name="db">图形数据库</param>
/// <param name="layerName">图层名</param>
/// <returns>AddLayerResult</returns>
public static AddLayerResult AddLayer(this Database db, string layerName)
{
//声明AddLayerResult类型的数据，用户返回
AddLayerResult res = new AddLayerResult();
try
{
SymbolUtilityServices.ValidateSymbolName(layerName, false);
}
catch (Exception)
{
res.statuts = AddLayerStatuts.IllegalLayerName;
return res;
}
using (Transaction trans = db.TransactionManager.StartTransaction())
{
//打开层表
LayerTable lt = (LayerTable)trans.GetObject(db.LayerTableId, OpenMode.ForRead);
//新建层表记录
if (!lt.Has(layerName))
{
LayerTableRecord ltr = new LayerTableRecord();
//判断要创建的图层名是否已经存在,不存在则创建
ltr.Name = layerName;
//升级层表打开权限
lt.UpgradeOpen();
lt.Add(ltr);
//降低层表打开权限
lt.DowngradeOpen();
trans.AddNewlyCreatedDBObject(ltr, true);
trans.Commit();
res.statuts = AddLayerStatuts.AddLayerOK;
res.layerName = layerName;
}
else
{
res.statuts = AddLayerStatuts.LayerNameExist;
}
}
return res;
}
public enum AddLayerStatuts
{
AddLayerOK,
IllegalLayerName,
LayerNameExist
}
//添加图层的返回值
public struct AddLayerResult
{
public AddLayerStatuts statuts;
public string layerName;
}
//修改图层属性的返回状态
public enum ChangeLayerPropertyStatus
{
ChangeOK,
LayerIsNotExist
}
}CAD 二次开发、插件定制↓↓↓