Imports System
Imports Autodesk.AutoCAD.Windows
Imports Autodesk.AutoCAD.Runtime
<Assembly: CommandClass(GetType(Contextmenu.Contextmenu))> 
Namespace Contextmenu
    Public Class Contextmenu
        Implements Autodesk.AutoCAD.Runtime.IExtensionApplication
        Private contextMenu As ContextMenuExtension
        '初始化菜单 
        Public Sub Initialize() Implements IExtensionApplication.Initialize
            AddMenu()
        End Sub
        '移除菜单 
        Public Sub Terminate() Implements IExtensionApplication.Terminate
            Remove()
        End Sub
        '添加菜单 
        Public Sub AddMenu()
            Try
                contextMenu = New ContextMenuExtension()
                contextMenu.Title = "添加右键菜单测试_Title"
                Dim MenuItem As Autodesk.AutoCAD.Windows.MenuItem
                MenuItem = New Autodesk.AutoCAD.Windows.MenuItem("添加右键菜单测试")
                AddHandler MenuItem.Click, AddressOf CallbackOnClick
                contextMenu.MenuItems.Add(MenuItem)
                Autodesk.AutoCAD.ApplicationServices.Application.AddDefaultContextMenuExtension(contextMenu)
            Catch ex As system.exception
                MsgBox(ex.ToString)
            End Try
        End Sub
        '移除菜单 
        Public Sub Remove()
            Try
                If contextMenu IsNot Nothing Then
                    Autodesk.AutoCAD.ApplicationServices.Application.RemoveDefaultContextMenuExtension(contextMenu)
                End If
            Catch ex As System.Exception
                 MsgBox(ex.ToString)
            End Try
        End Sub
        '菜单事件
        Public Sub CallbackOnClick(ByVal sender As Object, ByVal e As EventArgs)
            MsgBox("添加右键菜单测试")
        End Sub

    End Class
End Namespace

Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.EditorInput
Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.Windows
Imports System
Namespace ContextMenuApplication
    Public Class Commands
        Implements IExtensionApplication
        Public Sub Initialize() Implements IExtensionApplication.Initialize
            CountMenu.Attach()
        End Sub
        Public Sub Terminate() Implements IExtensionApplication.Terminate
            CountMenu.Detach()
        End Sub
        <CommandMethod("COUNT", CommandFlags.UsePickSet)> _
        Public Shared Sub CountSelection()
            Dim ed As Editor = Application.DocumentManager.MdiActiveDocument.Editor
            Dim psr As PromptSelectionResult = ed.GetSelection()
            If psr.Status = PromptStatus.OK Then
                ed.WriteMessage(vbLf & "Selected {0} entities.", psr.Value.Count)
            End If

        End Sub
    End Class
    Public Class CountMenu
        Private Shared cme As ContextMenuExtension
        Public Shared Sub Attach()
            cme = New ContextMenuExtension()
            Dim mi As New MenuItem("Count")
            AddHandler mi.Click, AddressOf OnCount
            cme.MenuItems.Add(mi)
            Dim rxc As RXClass = Entity.GetClass(GetType(Entity))
            Application.AddObjectContextMenuExtension(rxc, cme)
        End Sub
        Public Shared Sub Detach()
            Dim rxc As RXClass = Entity.GetClass(GetType(Entity))
            Application.RemoveObjectContextMenuExtension(rxc, cme)
        End Sub
        Private Shared Sub OnCount(ByVal o As [Object], ByVal e As EventArgs)
            Dim doc As Document = Application.DocumentManager.MdiActiveDocument
            doc.SendStringToExecute("_.COUNT ", True, False, False)
        End Sub
    End Class
End Namespace