vb.net批量删除cad的尺寸标注的代码

在VB.NET中，批量删除AutoCAD图纸中的尺寸标注需要利用AutoCAD的ObjectARX库，这是一个基于.NET的COM组件，允许与Autodesk AutoCAD进行交互。以下是一个简化的示例代码片段，它假设你已经引用了正确的Autodesk.AutoCAD.Runtime命名空间，并且用户有权限选择要操作的对象：

Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.EditorInput
Imports Autodesk.AutoCAD.DatabaseServices

Public Class Form1
    Dim acadApp As Application
    Dim doc As Document
    Dim db As Database

    Private Sub btnDeleteDimensions_Click(sender As Object, e As EventArgs) Handles btnDeleteDimensions.Click
        ' 获取当前活动文档
        acadApp = New Application()
        doc = acadApp.DocumentManager.MdiActiveDocument
        db = doc.Database

        ' 创建选择集并提示用户选择尺寸标注
        Using selectSet As SelectionSet = Selection.SelectObjects(db, "Select the dimension objects to delete", Selection.SELECTION_SET_NAME)
            If Not selectSet.IsEmpty Then
                ' 遍历选择的每一个对象
                For Each obj In selectSet
                    ' 检查对象是否是尺寸标注
                    Dim attDef As AttributeDefinition = TryCast(obj.Object, AttributeDefinition)
                    If attDef IsNot Nothing AndAlso attDef.Name.StartsWith("DIMENSION") Then
                        ' 删除选定的尺寸标注
                        attDef.Delete()
                        Console.WriteLine($"Deleted dimension: {attDef.Text}")
                    End If
                Next
                MessageBox.Show("Dimension objects deleted successfully.")
            Else
                MessageBox.Show("No dimensions selected.")
            End If
        End Using

        ' 清理资源
        acadApp.Quit()
    End Sub
End Class

注意：
1. 这段代码仅适用于命令行界面（CMDI）。在图形用户界面（GUI）中，可能需要额外处理事件和UI更新。
2. 使用此代码前，请确保已安装AutoCAD Object ARX.NET API，并添加适当的引用。