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//AcadService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;

namespace AcadService
{
    public class GApplication
    {
        /// <summary>
        /// AutoCAD.Application对应的类型
        /// </summary>
        System.Type type = null;
        /// <summary>
        /// AutoCAD.Application对应的对象
        /// </summary>
        Object obj = null;
        /// <summary>
        /// 创建AutoCAD.Application对象
        /// </summary>
        /// <returns></returns>
        public bool CreateInstance()
        {
            if (obj != null)
            {
                //已经创建了不能再创建了
                return false;
            }
            type = System.Type.GetTypeFromProgID(“AutoCAD.Application”);
            if (type == null)
            {
                //寻找AutoCAD.Application类型失败，可能没有安装AutoCAD
                return false;
            }
            try
            {
                obj = System.Activator.CreateInstance(type);
                return true;
            }
            catch
            {
                return false;
            }
        }
        /// <summary>
        /// 是否可见
        /// </summary>
        public bool Visible
        {
            get
            {
                if (obj == null || type == null)
                    return false;
                return (bool)type.InvokeMember(“Visible”, BindingFlags.GetProperty, null, obj, null);
            }
            set
            {
                if (obj == null || type == null)
                    return;
                type.InvokeMember(“Visible”, BindingFlags.SetProperty, null, obj, new object[] {value });
            }
        }
        /// <summary>
        /// 版本号
        /// </summary>
        public string Version
        {
            get
            {
                if (obj == null || type == null)
                    return null;
                return (string)type.InvokeMember(“Version”, BindingFlags.GetProperty, null, obj, null);
            }
        }
        /// <summary>
        /// 标题
        /// </summary>
        public string Caption
        {
            get
            {
                if (obj == null || type == null)
                    return null;
                return (string)type.InvokeMember(“Caption”, BindingFlags.GetProperty, null, obj, null);
            }
        }
        /// <summary>
        /// 执行程序acad.exe全路径
        /// </summary>
        public string FullName
        {
            get
            {
                if (obj == null || type == null)
                    return null;
                return (string)type.InvokeMember(“FullName”, BindingFlags.GetProperty, null, obj, null);
            }
        }
        /// <summary>
        /// 加载ARX 文件
        /// </summary>
        /// <param name=”Name”></param>
        public void LoadArx(string Name)
        {
            if (obj == null || type == null)
                return;
            type.InvokeMember(“LoadArx”,BindingFlags.InvokeMethod,null,obj,new object[]{Name});
        }
        /// <summary>
        /// 退出
        /// </summary>
        public void Quit()
        {
            if (obj == null || type == null)
                return;
            type.InvokeMember(“Quit”, BindingFlags.InvokeMethod, null, obj, null);
        }
        /// <summary>
        /// 更新
        /// </summary>
        public void Update()
        {
            if (obj == null || type == null)
                return;
            type.InvokeMember(“Update”, BindingFlags.InvokeMethod, null, obj, null);
        }
        /// <summary>
        /// 缩放到所有
        /// </summary>
        public void ZoomAll()
        {
            if (obj == null || type == null)
                return;
            type.InvokeMember(“ZoomAll”, BindingFlags.InvokeMethod, null, obj, null);
        }
        /// <summary>
        /// 缩放到范围
        /// </summary>
        public void ZoomExtents()
        {
            if (obj == null || type == null)
                return;
            type.InvokeMember(“ZoomExtents”, BindingFlags.InvokeMethod, null, obj, null);
        }
        /// <summary>
        /// 活动文档
        /// </summary>
        public object ActiveDocument
        {
            get
            {
                if (obj == null || type == null)
                    return null;
                return type.InvokeMember(“ActiveDocument”, BindingFlags.GetProperty, null, obj, null);
            }
        }
    }
    public class GDocument
    {
        private object obj = null;
        public GDocument(Object _obj)
        {
            obj = _obj;
        }
        /// <summary>
        /// 发送命令
        /// </summary>
        /// <param name=”Command”></param>
        public void SendCommand(string Command)
        {
            if (obj == null)
                return;
            obj.GetType().InvokeMember(“SendCommand”, BindingFlags.InvokeMethod, null, obj, new object[] { Command });
        }
        /// <summary>
        /// 关闭文档
        /// </summary>
        /// <param name=”SaveChanges”></param>
        /// <param name=”FileName”></param>
        public void Close(object SaveChanges, object FileName)
        {
            if (obj == null)
                return;
            obj.GetType().InvokeMember(“Close”, BindingFlags.InvokeMethod, null, obj, new object[] { SaveChanges, FileName });
        }
    }
}

//调用

GApplication app = new GApplication();
            if (!app.CreateInstance())
            {
                return;
            }
            app.Visible = true;
            GDocument doc = new GDocument(app.ActiveDocument);
            doc.SendCommand(“XX命令 “);
            doc.Close(false, null);
            app.Quit();