如何将IFormFile绑定回视图？

public class UploadViewModel
{
    public IFormFile File { get; set; }
}

<form method="post" enctype="multipart/form-data">
    <input type="file" name="File" />
    <button type="submit">上传文件</button>
</form>

public class UploadController : Controller
{
    [HttpPost]
    public IActionResult UploadFile([FromForm] UploadViewModel viewModel)
    {
        if (viewModel.File != null && viewModel.File.Length > 0)
        {
            // 处理文件逻辑，例如保存文件到服务器
            var fileName = viewModel.File.FileName;
            var filePath = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot", fileName);
            using (var fileStream = new FileStream(filePath, FileMode.Create))
            {
                viewModel.File.CopyTo(fileStream);
            }

            // 返回成功信息给视图
            ViewBag.Message = "文件上传成功！";
            return View();
        }
        
        // 返回错误信息给视图
        ViewBag.Message = "请选择要上传的文件！";
        return View();
    }
}