var sum =
psr.Value.GetObjectIds()
.Select(id => tr.GetObject(id, OpenMode.ForRead) as ????)
.Select(????)
.Sum();
ed.WriteMessage("\n总长度:{0:f1}", sum);
请问?号的地方该怎么写,小弟愚笨,高手别见笑
var sum =
psr.Value.GetObjectIds()
.Select(id => tr.GetObject(id, OpenMode.ForRead) as Curve)
.Select(c => c.GetDistanceAtParameter(c.EndParam))
.Sum();