在 EF Core 中将 IFormFile 上传到 FTP答案

【问题标题】：Upload IFormFile to FTP in EF Core在 EF Core 中将 IFormFile 上传到 FTP
【发布时间】：2022-01-06 22:14:45
【问题描述】：

我想将文件上传到本地 FTP 服务器，但文件路径错误。我认为这是由于 Handler 但我找不到错误。

文件上传；

public static class FileUpload
{
    public static string ImageUpload(this IFormFile file, string path)
    {
        var url = @"cdnadress" + "/" + Path.GetFileName(path);
        FtpWebRequest request = (FtpWebRequest)FtpWebRequest.Create(url);

        request.Method = WebRequestMethods.Ftp.UploadFile;
        request.Credentials = new NetworkCredential("username", "password");
        request.UsePassive = true;
        request.UseBinary = true;
        request.KeepAlive = true;

        //Load the file
        FileStream stream = File.OpenRead(path);
        byte[] buffer = new byte[stream.Length];

        stream.Read(buffer, 0, buffer.Length);
        stream.Close();

        //Upload file
        Stream reqStream = request.GetRequestStream();
        reqStream.Write(buffer, 0, buffer.Length);
        reqStream.Close();

        request = null;
        return null;
    }
}

创建处理程序；

public class SliderCreateHandler :
    IRequestHandler<SliderCreate, ApiResponse<SliderResponse>>
{
    private readonly IUnitOfWork _repo;
    private readonly IMapper _mapper;

    public SliderCreateHandler(IUnitOfWork repo, IMapper mapper)
    {
        _repo = repo;
        _mapper = mapper;
    }

    public async Task<ApiResponse<SliderResponse>> Handle(
        SliderCreate request, CancellationToken cancellationToken)
    { 
        var mapped = _mapper.Map<Slider>(request);

        var path = Environment.CurrentDirectory+ @"\Image\Slider\";
        mapped.ImageUrl = request.file.ImageUpload(path);

        if (string.IsNullOrEmpty(mapped.ImageUrl)) 
            return new ErrorApiResponse<SliderResponse>(ResultMessage.UnsupportedFileType);

        if (mapped == null)
            return new ErrorApiResponse<SliderResponse>(ResultMessage.NotCreatedSlider);

        var model = await _repo.Sliders.AddAsync(mapped);

        var response = _mapper.Map<SliderResponse>(model);

        return new SuccessApiResponse<SliderResponse>(response);
    }
}

这是错误 ID。我在某处的这条路上赛车，或者我错过了它。你能帮帮我吗？

【问题讨论】：

标签： c# .net file-upload entity-framework-core ftp

【解决方案1】：

如果您的目标是上传IFormFile，那么：

使用类 API，如 IFormFile.CopyTo 来访问文件内容。都是内存中的数据。不涉及物理路径/文件。
使用IFormFile.FileName 查找文件名。一些备用名称是值得推荐的，因为浏览器可能不提供。

FtpWebRequest request =
    (FtpWebRequest)FtpWebRequest.Create(@"cdnadress" + "/" + file.FileName);

// rest of your FtpWebRequest setup here

using (Stream reqStream = request.GetRequestStream())
{
    file.CopyTo(reqStream);
}

【讨论】：