Question

我正在使用ASP.Net Core 2.0和Razor Pages处理应用程序。我一直在关注如何将文件上传到Azure blob存储的Microsoft Docs，但到目前为止我还无法使用它。

我有两个独立的模型类。一个用于文件上载，一个用于Word。

文件上传类：

error: use of deleted function ‘const _Tp* std::addressof(const _Tp&&) [with _Tp = model*]’

其他课程：

public class WordUpload
{
    public IFormFile SoundFile { get; set; }
    public IFormFile SoundFileSentence { get; set; }
}

使用未传递的WordUpload.SoundFile的页面。这是问题，因为它总是返回null。

public class Word
{
    public int ID { get; set; }
    public string Answer { get; set; }
    public string AlternativeAnswer { get; set; }
    public string Hint { get; set; }
    public int Length { get; set; }
    public int Vowels { get; set; }
    public string Language { get; set; }
    public string Category { get; set; }
    public int Module { get; set; }
    public string Difficulty { get; set; }
    public string Sound { get; set; }
    public string SoundSentence { get; set; }
}

视图 - 页面：

public class CreateModel : PageModel
{
    private readonly Data.ApplicationDbContext _context;
    private readonly IWordRepository _wordRepository;

    public CreateModel(Data.ApplicationDbContext context, IWordRepository wordRepository)
    {
        _context = context;
        _wordRepository = wordRepository;
    }

    /// <summary>
    /// OnGet triggers when the page is opened
    /// </summary>
    /// <returns></returns>
    public IActionResult OnGet()
    {
        Word = new Word
        {
            Answer = "",
            AlternativeAnswer = "",
            Hint = "Hint",
            Length = 0,
            Vowels = 0,
            Language = "DK",
            Category = "",
            Module = 0,
            Difficulty = "",
            Sound = "",
            SoundSentence = ""
        };

        return Page();
    }

    [BindProperty]
    public WordUpload WordUpload { get; set; }

    [BindProperty]
    public Word Word { get; set; }

    /// <summary>
    /// Posts the data to the database async
    /// </summary>
    /// <returns></returns>
    public async Task<IActionResult> OnPostAsync()
    {
        if (!ModelState.IsValid)
        {
            return Page();
        }

        // Get the number of vowels in the word
        Word.Vowels = _wordRepository.NumberOfVowels(Word.Answer);

        // Save the length
        Word.Length = Word.Answer.Length;

        // upload file to blob storage
        Word.Sound = _wordRepository.UploadAudio(WordUpload.SoundFile);

        // save to db
        _context.Word.Add(Word);
        await _context.SaveChangesAsync();
        return RedirectToPage("./Index");
    }
}

WordUpload.SoundFile不随模型传递。当我调试应用程序时，它在控制器/页面中返回为null。所有其他属性都没有任何问题。

你知道如何传递文件吗？

Answer 1

您需要在表单上添加：

<form method="post" enctype="multipart/form-data">

在你的post方法中，如果模型绑定没有将文件绑定到模型有任何问题，你可以直接从Form.Files中获取它，如下所示：

 var formFile = HttpContext.Request.Form.Files[0];

你应该先检查HttpContext.Request.Form.Files.Length＆gt; 0或该代码将引发错误。然后将字节复制到模型以进行保存。另请参阅documentation

如何在ASP.Net Core 2.0 Razor页面中发布IFormFile？

1 个答案: