c# - 从 Action 过滤器中查看模型

Question

如何在.Net Core中通过过滤器传递模型 View ？ (我不想重定向)

我的操作过滤器:

private class CustomFilter : IActionFilter
{
    private readonly MainDbContext _mainDbContext;

    public CustomFilter(MainDbContext mainDbContext)
    {
        _mainDbContext = mainDbContext;
    }

    public void OnActionExecuting(ActionExecutingContext context)
    {
        var model = _mainDbContext.Groups.ToList();
        context.Result = new ViewResult { ViewName = "Index" };
    }

    public void OnActionExecuted(ActionExecutedContext context)
    {
    }
}

Answer 1

以下应该有效:

    public void OnActionExecuting(ActionExecutedContext context)
    {
        var model = _mainDbContext.Groups.ToList();

        var result = context.Result as ViewResult;
        if (result != null)
        {
            context.Result = new ViewResult { ViewName = "Index", ViewData = new ViewDataDictionary(result.ViewData)
            {
                Model = model
            }};
        }
    }

此外，请考虑使用 Result filter而不是 Action 过滤器。

Result filters are only executed for successful results - when the action or action filters produce an action result. Result filters are not executed when exception filters handle an exception.