Question

c#中打开CAD文件和对象的接口

namespace CAD2
{
public partial class Form1 : Form
{
Autodesk.AutoCAD.Interop.AcadApplication AcadApp;
Autodesk.AutoCAD.Interop.AcadDocument AcadDoc;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog pOpenDG = new OpenFileDialog();
pOpenDG.ShowDialog();
string filePath = pOpenDG.FileName;
AcadApp = new AcadApplication();/ 找不到类型或命名空间名称“AcadApplication”(是否缺少 using 指令或程序集引用

AcadApp.Application.Visible = true;
AcadDoc = AcadApp.Documents.Open(filePath, null, null);
}
}
}

错误在标注行。是很基本的问题，所以大家快帮帮我吧

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