Starting from Eyeshot 2020, we introduced a new property AutodeskProperties of type AutodeskProperties (renamed from AutodeskMiscProperties after Eyeshot 2025) in the Entity class. This class gathers inside it some miscellaneous Autodesk properties such as curve thickness, the thickness extrusion direction, and the entity XData.
Now to read and write the entity XData you need to proceed as follows:
Line line = new Line(0, 0, 0, 100, 100, 100);
List<KeyValuePair<short, object>> myList = new List<KeyValuePair<short, object>>();
myList.Add(new KeyValuePair<short, object>(1001, "MyAPP"));
myList.Add(new KeyValuePair<short, object>(1000, "BlaBlaBla"));
line.AutodeskProperties = new AutodeskProperties(myList);
line.AutodeskProperties.Thickness = 3; // here we set also the line thickness
design1.Entities.Add(line);
WriteAutodeskParams wrp = new WriteAutodeskParams(design1.Document)
{
Version = autodeskVersionType.Acad2007
};
WriteAutodesk wra = new WriteAutodesk(wrp, "test.dwg");
wra.DoWork();
// delete the line and load it from file
design1.Entities.Clear();
ReadAutodesk ra = new ReadAutodesk("test.dwg");
ra.DoWork();
ra.OpenTo(design1);
Entity first = design1.Entities.First();
Console.WriteLine("XData values:");
foreach (var pair in first.AutodeskProperties.XData)
{
Console.WriteLine(pair.Value);
}More details on AutoCAD extended entity data can be found here.
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