You can merge multiple selection sets be creating an ObjectIdCollection object and then adding the object ids from multiple selection sets together. In addition to adding object ids to an ObjectIdCollection object, you can remove object ids. Once all object ids are added to an ObjectIdCollection object, you can iterate through the collection of object ids and manipulate each object as needed.
用户可以合并多个选择集，需要创建一个 ObjectIdCollection 对象，然后向其中添加多个选择集的对象的 ObjectID。除了添加 ObjectID 到 ObjectIdCollection 对象中，也可以移除 ObjectID。一旦所有 ObjectID 添加到 ObjectIdCollection 对象后，就可以遍历 ObjectID 集合并操作每一个需要的对象。
This example prompts the user to select objects twice and then merges the two selection sets created into a single selection set.
本例提示用户选择对象两次然后合并两个选择集到一个独立的选择集中。
Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.EditorInput
<CommandMethod("MergeSelectionSets")> _Public Sub MergeSelectionSets()
'' 获得当前文档的编辑器 Get the current document editor
Dim acDocEd As Editor = Application.DocumentManager.MdiActiveDocument.Editor
'' 要求在图形区域中选择对象 Request for objects to be selected in the drawing area
Dim acSSPrompt As PromptSelectionResult
acSSPrompt = acDocEd.GetSelection()
Dim acSSet1 As SelectionSet
Dim acObjIdColl As ObjectIdCollection = New ObjectIdCollection()
'' 如果提示状态是 OK，对象就被选择了 If the prompt status is OK, objects were selected
If acSSPrompt.Status = PromptStatus.OK Then
'' Get the selected objects
acSSet1 = acSSPrompt.Value
'' 添加选择的对象到 ObjectIDCollection 中 Append the selected objects to the ObjectIdCollection
acObjIdColl = New ObjectIdCollection(acSSet1.GetObjectIds())
End If
'' 要求在图形区域中选择对象 Request for objects to be selected in the drawing area
acSSPrompt = acDocEd.GetSelection()
Dim acSSet2 As SelectionSet
'' 如果提示状态是 OK，对象就被选择了 If the prompt status is OK, objects were selected
If acSSPrompt.Status = PromptStatus.OK Then
acSSet2 = acSSPrompt.Value
'' 检查 ObjectIDCollection 的大小，如果为 0 就重新初始化它 Check the size of the ObjectIdCollection, if zero, then initialize it
If acObjIdColl.Count = 0 Then
acObjIdColl = New ObjectIdCollection(acSSet2.GetObjectIds())
Else
Dim acObjId As ObjectId
'' 遍历第二个选择集 Step through the second selection set
For Each acObjId In acSSet2.GetObjectIds()
'' 添加每个对象 ID 到 ObjectIDCollection 中 Add each object id to the ObjectIdCollection
acObjIdColl.Add(acObjId)
Next
End If
End If
Application.ShowAlertDialog("Number of objects selected: " & _acObjIdColl.Count.ToString())
End Sub
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
[CommandMethod("MergeSelectionSets")]public static void MergeSelectionSets()
{// 获得当前文档的编辑器 Get the current document editor
Editor acDocEd = Application.DocumentManager.MdiActiveDocument.Editor;
// 要求在图形区域中选择对象 Request for objects to be selected in the drawing area
PromptSelectionResult acSSPrompt;
acSSPrompt = acDocEd.GetSelection();
SelectionSet acSSet1;
ObjectIdCollection acObjIdColl = new ObjectIdCollection();
// 如果提示状态是 OK，对象就被选择了 If the prompt status is OK, objects were selected
if (acSSPrompt.Status == PromptStatus.OK)
{// Get the selected objects
acSSet1 = acSSPrompt.Value;
// 添加选择的对象到 ObjectIDCollection 中 Append the selected objects to the ObjectIdCollection
acObjIdColl = new ObjectIdCollection(acSSet1.GetObjectIds());
}
// 要求在图形区域中选择对象 Request for objects to be selected in the drawing area
acSSPrompt = acDocEd.GetSelection();
SelectionSet acSSet2;
// 如果提示状态是 OK，对象就被选择了 If the prompt status is OK, objects were selected
if (acSSPrompt.Status == PromptStatus.OK)
{acSSet2 = acSSPrompt.Value;
// 检查 ObjectIDCollection 的大小，如果为 0 就重新初始化它 Check the size of the ObjectIdCollection, if zero, then initialize it
if (acObjIdColl.Count == 0)
{acObjIdColl = new ObjectIdCollection(acSSet2.GetObjectIds());
}
else
{// 遍历第二个选择集 Step through the second selection set
foreach (ObjectId acObjId in acSSet2.GetObjectIds())
{// 添加每个对象 ID 到 ObjectIDCollection 中 Add each object id to the ObjectIdCollection
acObjIdColl.Add(acObjId);
}
}
}
Application.ShowAlertDialog("Number of objects selected: " +acObjIdColl.Count.ToString());
}
