<Grid>
        <Button Height="50" Click="Button_Click" Margin="285,184,157,185" Content="打开程序" Tag=""/>
        <TextBox x:Name="txtPath" HorizontalAlignment="Left" Height="23" Margin="245,110,0,0" TextWrapping="Wrap" Text="D:\Program Files (x86)\Tencent\WeChat\WeChat.exe" VerticalAlignment="Top" Width="450"/>
    </Grid>

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            string Path = "";
            try
            {
                Path = @"D:\Program Files (x86)\Tencent\WeChat\WeChat.exe";
                if (!string.IsNullOrEmpty(txtPath.Text))
                {
                    Path = txtPath.Text;
                }
                System.Diagnostics.Process.Start(Path);
                Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.CurrentDocument.Editor.WriteMessage("启动成功:" + Path);
            }
            catch (Exception ex)
            {

                Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.CurrentDocument.Editor.WriteMessage("路径：" + Path + ",启动异常," + ex.Message);
            }
        }

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WpfApp4
{
     public class Class1
    {
       [CommandMethod("OpenExe")] 
       public void OpenExe()
        {
            MainWindow main = new MainWindow();
            Application.ShowModelessWindow(main);
        }
    }
}