说明

在委托的学习一文中,
提供了一个函数用于输入路径获取数据库,
本文是以激活形式打开cad文档.

代码

public class OpreateCad {
    [CommandMethod(nameof(test_qiantai), CommandFlags.Session)]
    public void test_qiantai() {
        var dm = Acap.DocumentManager;
        var doc = dm.MdiActiveDocument;
        var ed = doc.Editor;
        // string dwgPath = AutoGo.DwgCurrentPath();
        string dwgPath = AppDomain.CurrentDomain.BaseDirectory;
        var ofd = new OpenFileDialog {
            AutoUpgradeEnabled = false,//OpenFileDialog会卡顿,用这个就好了
            Filter = "AutoCAD 图形(*.dwg)|*.dwg",
            Multiselect = true,//允许同时选择多个文件
            InitialDirectory = dwgPath,
        };
        if (ofd.ShowDialog() != DialogResult.OK) return;
        var dwgPaths = ofd.FileNames;

        // 这个过滤是为了:或许你要封装进去函数内呢
        var pa = dwgPaths.Where(file => !File.Exists(file));
        foreach(var file in pa) {
            ed.WriteMessage("文件不存在: ", file);
        }
        pa = dwgPaths.Where(file => File.Exists(file));
        var map = OpenDwgFile(pa);
        // var map = GetMap(pa);
        foreach(var pair in map)
            pair.Value.ActiveTask(layout => ed.WriteMessage(layout.LayoutName));
    }

    /// <summary>
    /// 前台打开dwg
    /// </summary>
    /// <param name="dwgPaths"></param>
    Dictionary<string, Document> OpenDwgFile(IEnumerable<string> dwgPaths) {
        var map = new Dictionary<string, Document>();
        var set = dwgPaths.ToHashSet();
        var dm = Acap.DocumentManager;
        foreach(var file in set) {
#if NET35
            var doc = dm.Open(file, false);
#elif NET40
            var doc = DocumentCollectionExtension.Open(dm, file, false);
#else
            // 这个没有返回值啊,需要用文档事件来抓...
            // dm.AppContextOpenDocument(file);
            var doc = dm.Open(file, false);
#endif
            map.Add(file, doc);
        }
        return map;
    }

    // 你必须要设置CommandFlags.Session在命令标记上面
    // doc.IsActive在初始化时会异常,有Session标记则不会是IsActive的
    Dictionary<string, Document> GetMap(IEnumerable<string> dwgPaths) {
        var pathSet = dwgPaths.ToHashSet();
        var map = Acap.DocumentManager.Cast<Document>()
            .Where(doc =>!doc.IsDisposed && pathSet.Contains(doc.Name))
            .ToDictionary(doc => doc.Name, doc => doc);
        return map;
    }
}

public static class DocumentHelper {
    // 遍历激活
    // 切换文档执行之后,后续代码不执行是因为没有Session标记
    public static void ActiveTask(this Document doc, Action<Layout> action) {
        if (doc.IsDisposed) throw new("文档已经释放");
        if (!doc.IsActive) {
            Acap.DocumentManager.MdiActiveDocument = doc;
        }
        var db = doc.Database;
        using var docLocker = doc.LockDocument(); // 锁文档,为了切换布局
        using var tr = db.TransactionManager.StartTransaction();
        using var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
        foreach (ObjectId btrId in bt) {
            using var btr = (BlockTableRecord)tr.GetObject(btrId, OpenMode.ForRead);
            if (!btr.IsLayout) continue; // 这里应该有索引才对
            using var layout = (Layout)tr.GetObject(btr.LayoutId, OpenMode.ForRead);
            // 非模态这里会失败,所以要锁文档
            if (LayoutManager.Current.CurrentLayout != layout.LayoutName) {
                LayoutManager.Current.CurrentLayout = layout.LayoutName;
            }
            action(layout);
         }
    }
}

不能doc.Dispose()否则导致切换文档内存报错,
并且没有CommandFlags.Session的话,
释放后 doc.IsActive == false.

throw new FileNotFoundException("文件不存在", dwgPath);
ed.WriteMessage("\n****此文件打开错误: " + dwgPath + "\n错误信息:" + e.Message);
访问中的文件如何判断,官方devblog推荐是追加方式访问文件

(完)