在 ASP.NET Core 中使用不同的类在视图中显示不同的视图数据

Answer 1

在您的操作中的 switch-case 语句中，您可以为每个案例设置一个带有警报类的 ViewData 条目：

public async Task<IActionResult> ActiveEmailAccount(EmailActiveAccountViewModel active)
{
    if (ModelState.IsValid)
    {
        var result = await _userService.ActiveAccount(active);

        switch (result)
        {
            case ActiveEmailResult.Error:
                ModelState.AddModelError("CustomError", "You Have Error ");
                ViewData["AlertClass"] = "alert-danger";
                break;

            case ActiveEmailResult.NotActive:
                ModelState.AddModelError("CustomError", "You Are not Active. ");
                ViewData["AlertClass"] = "alert-warning";
                break;

            case ActiveEmailResult.Success:
                ModelState.AddModelError("CustomError", "You Are Active ");
                ViewData["AlertClass"] = "alert-success";
                break;
        }

        // this is not needed for this scenario
        //ViewData["Active"] = result;
    }

    return View(active);
}

然后在您的视图中，您可以使用Html.ValidationMessage html helper 获取模型状态消息并使用ViewData 获取警报类：

<div class="alert @ViewData["AlertClass"]">
    @Html.ValidationMessage("CustomError")
</div>

剃须刀解决方案：

您可以在视图中使用 switch-case 语句：

@switch ((ActiveEmailResult)ViewData["Active"])
{
    case ActiveEmailResult.Error:
        <div class="alert alert-danger">You Have Error </div>
        break;

    case ActiveEmailResult.NotActive:
        <div class="alert alert-warning">You Are not Active. </div>
        break;

    case ActiveEmailResult.Success:
        <div class="alert alert-success">You Are Active </div>
        break;
}