cad c#二次开发 图层封装 获取当前层
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IDforeach (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）}}}}
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IDObjectId 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;#endregiontr.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 transactiontransaction.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↓↓↓