1

在此处输入图像描述这是我的模型课

public class ImageModel
{
    [Key]
    public int ImageId { get; set; }

    [Column(TypeName = "nvarchar(50)")]
    public string Title { get; set; }

    [Column(TypeName = "nvarchar(100)")]
    [DisplayName("Image Name")]
    public string ImageName { get; set; }

    [NotMapped]
    [DisplayName("Upload File")]
    public IFormFile ImageFile { get; set; }


}

这是我用于发布请求的控制器类我创建了一个 wwwroot 文件夹来保存图像

[Route("api/[Controller]")]
[ApiController]
public class ImageController : Controller
{
    private readonly Databasecontext _context;
    private readonly IWebHostEnvironment _hostEnvironment;



    

    public ImageController(Databasecontext context, IWebHostEnvironment hostEnvironment)
    {
        _context = context;
        this._hostEnvironment = hostEnvironment;
    }

    // GET: Image
    public async Task<IActionResult> Index()
    {
        return View(await _context.Images.ToListAsync());
    }

    // GET: Image/Create
    public IActionResult Create()
    {
        return View();
    }

    // POST: Image/Create

    [HttpPost]
    
    public async Task<IActionResult> Create([Bind("ImageId,Title,ImageName")] ImageModel imageModel)
    {
        if (ModelState.IsValid)
        {
            //Save image to wwwroot/image
            string wwwRootPath = _hostEnvironment.WebRootPath;
            string fileName = Path.GetFileNameWithoutExtension(imageModel.ImageFile.FileName);
            string extension = Path.GetExtension(imageModel.ImageFile.FileName);
            imageModel.ImageName = fileName = fileName + DateTime.Now.ToString("yymmssfff") + extension;
            string path = Path.Combine(wwwRootPath + "/Image/", fileName);
            using (var fileStream = new FileStream(path, FileMode.Create))
            {
                await imageModel.ImageFile.CopyToAsync(fileStream);
            }
            //Insert record
            _context.Add(imageModel);
            await _context.SaveChangesAsync();
            return RedirectToAction(nameof(Index));
        }
        return View(imageModel);


    }

这是我的数据库上下文

 public DbSet<ImageModel> Images { get; set; }

我只需要使用邮递员对此进行测试并将其与角度相结合。有人能帮我吗?当我通过邮递员发送图像时出现此错误请求实体的媒体类型不支持服务器或资源不支持。

4

2 回答 2

0

那是因为您[ApiController]在控制器中使用,默认情况下它允许来自正文的数据。因此,您需要使用[FromForm]如下属性来指定来源:

[HttpPost]
public async Task<IActionResult> Create([Bind("ImageId,Title,ImageName")][FromForm] ImageModel imageModel)
{
    //..
    return View(imageModel);
}

此外,如果使用[Bind("ImageId,Title,ImageName")],则 ImageFile 无法绑定到模型。

于 2021-10-11T02:41:18.360 回答
0

对不起,我的西班牙语在代码中。

这就是我在 Base64 中上传文件然后将文件复制到目录的方式。我ArchivoAnexoUploadDto使用页面http://base64.guru/converter/encode/file来填充对象,以将文件转换为 base64。

我希望这段代码摘录对你有用

1 - 控制器

[HttpPost("UploadFileList")]
    public async Task<IActionResult> UploadFileList(List<ArchivoAnexoUploadDto> fileList)
    {
        IOperationResult<object> operationResult = null;
        try
        {
            operationResult = await _fileService.UploadFileList(fileList);

            if (!operationResult.Success)
            {
                return BadRequest(operationResult.ErrorMessage);
            }

            return Ok(operationResult.Entity);

        }
        catch (Exception ex)
        {
            return BadRequest(operationResult.Entity);
        }

    }

我 Recibe 对象列表 < ArchivoAnexoUploadDto > 并且该服务将基数 64 转换为 Bytes 数组。

2 - 服务

public async Task<IOperationResult<object>> UploadFileList(List<ArchivoAnexoUploadDto> files)
    {
        List<ArchivoAnexoCreateDto> fileList = PrepareFileList(files);

        Response result = ValidateFiles(fileList);

        if (!result.Status)
        {
            Response responseError = new()
            {
                Status = false,
                Message = ((FormFile)result.Object).FileName,
                MessageDetail = result.Message
            };
            return OperationResult<object>.Ok(responseError);
        }

        var saveResult = await SaveFileList(fileList);

        Response respuesta = new()
        {
            Status = true,
            Message = "Los archivos fueron almacenados exitosamente.",
            MessageDetail = ""
        };
        return OperationResult<object>.Ok(respuesta);
    }


    private List<ArchivoAnexoCreateDto> PrepareFileList(List<ArchivoAnexoUploadDto> files)
    {
        List<ArchivoAnexoCreateDto> formFileList = new List<ArchivoAnexoCreateDto>();

        foreach (ArchivoAnexoUploadDto newFile in files)
        {

            byte[] fileBytes = Convert.FromBase64String(newFile.Base64);

            string filePath = Path.Combine(_fileSettings.PrincipalPath, _fileSettings.PrincipalFolderName, newFile.NombreArchivo);
            MemoryStream memoryStream = new MemoryStream();
            memoryStream.Write(fileBytes, 0, fileBytes.Length);

            FormFile fileData = new FormFile(memoryStream, 0, memoryStream.Length, newFile.NombreArchivo, newFile.NombreArchivo);

            ArchivoAnexoCreateDto fileDto = new()
            {
                FileId = 0,
                Data = fileData,
                FileName = newFile.NombreArchivo,
                Module = newFile.Modulo
            };
            formFileList.Add(fileDto);
        }

        return formFileList;
    }

    private Response ValidateFiles(List<ArchivoAnexoCreateDto> fileList)
    {
        foreach (ArchivoAnexoCreateDto fileObj in fileList)
        {
            IFormFile file = fileObj.Data;
            try
            {
                ValidateFile(file);
            }
            catch (Exception exception)
            {
                return new Response { Status = false, Message = exception.Message, Object = file };
            }
        }
        return new Response { Status = true, Message = "" };
    }

服务 recibe 数组并PrepareFileList返回相同的数据,但数组有 IFormFile 而不是 Base64 字符串。

3 - Dtos

public sealed class ArchivoAnexoUploadDto
{
    public long AnexoFileId { get; set; }
    public string Base64 { get; set; }
    public string NombreArchivo { get; set; }
    public Module Modulo {get; set;}
}

public sealed class ArchivoAnexoCreateDto
{
    public long FileId { get; set; }
    public IFormFile Data { get; set; }
    public int FileTypeId { get; set; }
    public string FileName { get; set; }
    public Module Module { get; set; }
}

ArchivoAnexoUploadDto是接收 base64 和文件名的 Dto。

ArchivoAnexoCreateDto是具有 IFormFile 属性的 Dto,用于将文件复制到目录。

4 - 验证 IFormFile 以复制到目录

private void ValidateFile(IFormFile fileToCreate)
    {
        if (fileToCreate == null)
        {
            throw new Exception("No ha enviado ningun archivo.");
        }

        IOperationResult<string> fileExtensionResult = _fileService.GetFileExtension(fileToCreate);

        if (!fileExtensionResult.Success)
        {
            throw new Exception(fileExtensionResult.ErrorMessage);
        }

        if (!_fileSettings.AllowedExtensions.Contains(fileExtensionResult.Entity))
        {
            throw new Exception("La extención del archivo no es permitida.");
        }

        IOperationResult<long> fileSizeResult = _fileService.GetFileSize(fileToCreate);

        if (!fileSizeResult.Success)
        {
            throw new Exception("Ha ocurrido un error obteniendo el tamaño del archivo.");
        }

        if (fileSizeResult.Entity > _fileSettings.MaxFileSize)
        {
            throw new Exception("El tamaño del archivo supera el limite.");
        }
    }

这是验证的条件(仅用于解释)我这样做是因为业务配置了扩展名列表、文件大小限制等。

于 2021-10-13T21:49:59.553 回答