在两个IActionresult之间共享列表

// 在第一个IActionResult中设置TempData
TempData["MyList"] = myList;

// 在第二个IActionResult中获取TempData
var myList = TempData["MyList"] as List<MyModel>;

// 在第一个IActionResult中设置会话
HttpContext.Session.Set<List<MyModel>>("MyList", myList);

// 在第二个IActionResult中获取会话
var myList = HttpContext.Session.Get<List<MyModel>>("MyList");

services.AddSession();

// 定义一个单例服务
public interface IMyListService
{
    List<MyModel> GetList();
    void SetList(List<MyModel> myList);
}

public class MyListService : IMyListService
{
    private List<MyModel> _myList;

    public List<MyModel> GetList()
    {
        return _myList;
    }

    public void SetList(List<MyModel> myList)
    {
        _myList = myList;
    }
}

// 在第一个IActionResult中设置列表
private readonly IMyListService _myListService;

public MyController(IMyListService myListService)
{
    _myListService = myListService;
}

public IActionResult Action1()
{
    var myList = GenerateList();
    _myListService.SetList(myList);
    return View();
}

// 在第二个IActionResult中获取列表
public IActionResult Action2()
{
    var myList = _myListService.GetList();
    return View(myList);
}

services.AddSingleton<IMyListService, MyListService>();