代码创建的ribbon在切换工作空间后消失的解决方法

autodesk论坛中有现成的解决方法

标题

RibbonTab in all Workspaces

链接  https://forums.autodesk.com/t5/net/ribbontab-in-all-workspaces/td-p/2853958

主要回帖内容：

When you change workspace your ribbon wilI be unloaded. Listen to the SystemVariableChanged event and watch the WSCURRENT setting. This system variable will be changed when a new workspace become current. If this is changed you can run your code to add your ribbon tab.

Here is an example

public void Initialize()
{
if (Autodesk.Windows.ComponentManager.Ribbon == null)
{
//load the custom Ribbon on startup, but at this point
//the Ribbon control is not available, so register for
//an event and wait
Autodesk.Windows.ComponentManager.ItemInitialized +=
new EventHandler(ComponentManager_ItemInitialized);
//not in published sample
Autodesk.AutoCAD.ApplicationServices.Application.SystemVariableChanged += new Autodesk.AutoCAD.ApplicationServices.SystemVariableChangedEventHandler(Application_SystemVariableChanged);

}
else
{
//the assembly was loaded using NETLOAD, so the ribbon
//is available and we just create the ribbon

Your command for creating your ribbon 'createRibbon();'

Autodesk.AutoCAD.ApplicationServices.Application.SystemVariableChanged +=
new Autodesk.AutoCAD.ApplicationServices.SystemVariableChangedEventHandler(Application_SystemVariableChanged);

}
}

void Application_SystemVariableChanged(object sender,
Autodesk.AutoCAD.ApplicationServices.SystemVariableChangedEventArgs e)
{
//Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
//ed.WriteMessage(" -Sys Var Changed: " + e.Name);

if (e.Name.ToLower() == "wscurrent")
{
createRibbon();
}
}

Sorry about te bad code format but i think this will help.

我根据上面的代码进行了一些修改，

修改后的代码能把ribbon存住。

// (C) Copyright 2019 by  
//
using System;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.Windows;
using System.Drawing;

// This line is not mandatory, but improves loading performances
[assembly: ExtensionApplication(typeof(RibbonTest.MyPlugin))]

namespace RibbonTest
{

    // This class is instantiated by AutoCAD once and kept alive for the 
    // duration of the session. If you don't do any one time initialization 
    // then you should remove this class.
    public class MyPlugin : IExtensionApplication
    {

        void IExtensionApplication.Initialize()
        {
            // Add one time initialization here
            // One common scenario is to setup a callback function here that 
            // unmanaged code can call. 
            // To do this:
            // 1. Export a function from unmanaged code that takes a function
            //    pointer and stores the passed in value in a global variable.
            // 2. Call this exported function in this function passing delegate.
            // 3. When unmanaged code needs the services of this managed module
            //    you simply call acrxLoadApp() and by the time acrxLoadApp 
            //    returns  global function pointer is initialized to point to
            //    the C# delegate.
            // For more info see: 
            // http://msdn2.microsoft.com/en-US/library/5zwkzwf4(VS.80).aspx
            // http://msdn2.microsoft.com/en-us/library/44ey4b32(VS.80).aspx
            // http://msdn2.microsoft.com/en-US/library/7esfatk4.aspx
            // as well as some of the existing AutoCAD managed apps.

            // Initialize your plug-in application here


            Application.Idle += LoadMyRibbon;
            Application.SystemVariableChanged += Application_SystemVariableChanged;


        }
        static void Application_SystemVariableChanged(object sender, Autodesk.AutoCAD.ApplicationServices.SystemVariableChangedEventArgs e)
        {
            //Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
            //ed.WriteMessage("
-Sys Var Changed: " + e.Name);
            if (e.Name.ToLower() == "wscurrent")
            {
                CreateRibbon();
                Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage("
ribbon重建完成");
            }
        }
        static private void LoadMyRibbon(object sender, EventArgs e)
        {
            CreateRibbon();
            Application.Idle -= LoadMyRibbon;

        }

        private static void CreateRibbon()
        {
            RibbonControl rc = ComponentManager.Ribbon;
            var sth = rc.Tabs;
            RibbonTab rt = null;
            foreach (RibbonTab tab in rc.Tabs)
            {
                if (tab.AutomationName == "Test")
                {
                    rt = tab;
                    break;
                }
            }
            if (rt == null)
            {
                rt = new RibbonTab();
                rt.Title = "Test";
                rt.Id = "Test_ID";
                rc.Tabs.Insert(0, rt);
            }
            RibbonPanelSource rps = new RibbonPanelSource();
            rps.Title = "第一个";
            RibbonPanel rp = new RibbonPanel();
            rp.Source = rps;
            rt.Panels.Insert(0, rp);
            RibbonButton rb = new RibbonButton();
            rb.Text = "第一个按钮";
            rb.ShowText = true;
            rb.ShowImage = true;
            rps.Items.Add(rb);

        }

        void IExtensionApplication.Terminate()
        {
            // Do plug-in application clean up here
        }

    }

}