012集——CAD图中线段坐标导出到txt（CAD—C#二次开发入门）

如图所示，CAD图中line和pline坐标和图层数据导出到txt文本。

 程序运行后导出如下文件：

附部分源代码：

public static void DwgToTxt(this Database db)
{
   // var db = Z.db;
    var ed = Z.ed;
    //Point3d pt ;  
    BlockData data = new BlockData();
    List<BlockData> datas = new List<BlockData>();
    List<string> str = new List<string>();
    using (var tr = db.TransactionManager.StartTransaction())
    {
        var bt = tr.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
        var btr = tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForRead) as BlockTableRecord;
        int i = 0;
        int linenum = 1;
        int plin