C# AutoCAD 利用Editor.CommandAsync 同步监测自带命令的执行情况

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小编点评

**官方文档解释：** 该方法用于绘制圆形，并可以通过修改颜色来进行更改。 **代码示例：** ```csharp public void tt_CommandAsync() { try { var ed = Application.DocumentManager.MdiActiveDocument.Editor; var db = Application.DocumentManager.MdiActiveDocument.Database; Application.SetSystemVariable("filedia", 0); var cr = ed.CommandAsync("circle", "0,0,0", 500); cr.OnCompleted(() => { var psr = ed.SelectLast(); ed.WriteMessage($"\"" + Environment.NewLine); Application.SetSystemVariable("filedia", 1); if (psr.Status == PromptStatus.OK) { using (var tr = db.TransactionManager.StartTransaction()) { var ent = tr.GetObject(psr.Value[0].ObjectId, OpenMode.ForWrite) as Entity; if (ent != null) { ent.Color = Color.FromColorIndex(ColorMethod.ByAci, 150); tr.Commit(); } else tr.Abort(); } } }); } catch (System.Exception ex) { Application.ShowAlertDialog(ex.StackTrace); } } ``` **其他说明：** * `ColorMethod.ByAci` 用于指定颜色的名称，其中 150 代表红色。 * 该示例假设圆形已存在于文档中，并具有默认颜色。

正文

#1官方文档并无相关解释：AutoCAD 2023 Developer and ObjectARX Help | Editor.CommandAsync Method | Autodesk

#2 上例子，我用自带的命令画一个圆，画完后我要修改它的颜色，此时该如何操作呢，下面是可用的代码

[CommandMethod(nameof(tt_CommandAsync))]
        public void tt_CommandAsync()
        {
            try
            {
                var ed = Application.DocumentManager.MdiActiveDocument.Editor;
                var db = Application.DocumentManager.MdiActiveDocument.Database;
                Application.SetSystemVariable("filedia", 0);
                var cr = ed.CommandAsync("circle", "0,0,0", 500);
                cr.OnCompleted(() =>
                        {
                            var psr = ed.SelectLast();
                            ed.WriteMessage($"" + Environment.NewLine);
                            Application.SetSystemVariable("filedia", 1);
                            if (psr.Status == PromptStatus.OK)
                            {
                                using (var tr = db.TransactionManager.StartTransaction())
                                {
                                    var ent = tr.GetObject(psr.Value[0].ObjectId, OpenMode.ForWrite) as Entity;
                                    if (ent != null)
                                    {
                                        ent.Color = Color.FromColorIndex(ColorMethod.ByAci, 150);
                                        tr.Commit();
                                    }
                                    else tr.Abort();
                                }
                            }
                        }
                    );
            }
            catch (System.Exception ex)
            {
                Application.ShowAlertDialog(ex.StackTrace);
            }
        }

测试命令是可以执行的，达到了我们要求。