各图元对应的DXF名

    public static bool IsInFilter(this Entity ent, string str)
    {
      string typ = ent.GetType().Name;
      List<string> nameLst = str.ToList();
      string lspType = "";

      switch (typ)
      {
        case "Arc": lspType = "ARC"; break;
        case "AttributeDefinition": lspType = "ATTDEF"; break;
        case "AttributeReference": lspType = "ATTRIB"; break;
        case "Circle": lspType = "CIRCLE"; break;
        case "Ellipse": lspType = "ELLIPSE"; break;
        case "Hatch": lspType = "HATCH"; break;
        case "BlockReference": lspType = "INSERT"; break;
        case "Leader": lspType = "LEADER"; break;
        case "Line": lspType = "LINE"; break;
        case "Polyline": lspType = "LWPOLYLINE"; break;
        case "Mline": lspType = "MLINE"; break;
        case "MLeader": lspType = "MULTILEADER"; break;
        case "MText": lspType = "MTEXT"; break;
        case "Ray": lspType = "RAY"; break;
        case "Region": lspType = "REGION"; break;
        case "Solid": lspType = "SOLID"; break;
        case "Spline": lspType = "SPLINE"; break;
        case "Table": lspType = "TABLE"; break;
        case "DBText": lspType = "TEXT"; break;
        case "Viewport": lspType = "VIEWPORT"; break;
        case "Wipeout": lspType = "WIPEOUT"; break;
        case "Xline": lspType = "XLINE"; break;
        default:
          break;
      }
      if (str.ToUpper().Contains("DIMENSION"))
      {
        lspType = "DIMENSION";
      }
      return str.ToUpper().ToList().Contains(lspType);
    }