将通过 HTTP 上传到 ASP.NET 的文件上传到 C# 中的-C#/.NET问题

Upload file uploaded via HTTP to ASP.NET further to FTP server in C#(将通过 HTTP 上传到 ASP.NET 的文件上传到 C# 中的 FTP 服务器)

本文介绍了将通过 HTTP 上传到 ASP.NET 的文件上传到 C# 中的 FTP 服务器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

上传表格:

<form asp-action="Upload" asp-controller="Uploads" enctype="multipart/form-data">
<input type="file" name="file" maxlength="64" />
<button type="submit">Upload</button>

控制器/文件上传:

public void Upload(IFormFile file){
    using (WebClient client = new WebClient())
    {
        client.Credentials = new NetworkCredential("xxxx", "xxxx");
        client.UploadFile("ftp://xxxx.xxxx.net.uk/web/wwwroot/images/", "STOR", file.FileName);
    }
}

问题:

出现错误找不到文件 xxxx".我知道问题是它试图找到文件，因为它是 FTP 服务器上的 "C:path-to-vs-filesexamplePhoto.jpg" ，这显然不存在.我一直在这里查看许多问题/答案，我认为我需要某种 FileStream 读/写代码.但我目前还没有完全理解这个过程.

Getting error "Could not find file xxxx". I understand the issue is that it's trying to find the file as it is "C:path-to-vs-filesexamplePhoto.jpg" on the FTP server, which obviously doesn't exist. I've been looking at many questions/answers on here and I think I need some kind of FileStream read/write cod. But I'm not fully understanding the process at the moment.

推荐答案

使用 IFormFile.CopyTo 或 IFormFile.OpenReadStream 来访问上传文件的内容.

Use IFormFile.CopyTo or IFormFile.OpenReadStream to access the contents of the uploaded file.

虽然 WebClient 无法使用 Stream 接口.所以你最好使用 FtpWebRequest:

Though WebClient cannot work with Stream interface. So you better use FtpWebRequest:

public void Upload(IFormFile file)
{
    FtpWebRequest request =
        (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
    request.Credentials = new NetworkCredential("username", "password");
    request.Method = WebRequestMethods.Ftp.UploadFile;  

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

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