从控制台应用程序接收文件时，IFormFile始终为null [英] IFormFile is always null when receiving file from console app

问题描述

我已经准备好WebApi方法来接受文件，如下所示：
（例如uri https ：// localhost：44397 / api / uploadfile

I have my WebApi method ready to accept file as parameter shown below: (e.g. uri "https://localhost:44397/api/uploadfile"

 [Route("api/[controller]")]
 [ApiController]
 public class UploadFileController : ControllerBase
 {
    [HttpPost]
    public async Task<IActionResult> Post([FromForm] IFormFile file)
    {
    }
}

Am使用控制台应用程序将文件发送到此api方法，下面是我的代码：

Am using console app to send file to this api method, below is my code:

    public static void Send(string fileName)
    {
        using (var client = new HttpClient())
        using (var content = new MultipartFormDataContent())
        {
            client.BaseAddress = new Uri("https://localhost:44397");
            var fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
            var index = fileName.LastIndexOf(@"\");
            var fn = fileName.Substring(index + 1);
            fs.Position = 0;

            var contentfile = new StreamContent(fs);
            content.Add(contentfile, "file", fn);
            var result = client.PostAsync("/api/uploadfile", content).Result;
        }
    }

我还与其他客户（例如邮递员）进行了核对，它在那里也失败了（所以这似乎是服务器端的问题，而不是控制台应用程序的问题）。

I also checked with other clients (e.g. Postman) and it failed there too (so it seems like an issue in the server-side, rather than the console app).

不知道我在这里做错了什么。每当我检查WebApi方法文件参数始终为空时。

Not sure what am i doing wrong here. Whenever I check my WebApi method file parameter is always null.

任何人都可以帮助我找到解决方案。我尝试搜索博客，但无济于事。我可能在这里做些天真。

Can anyone help me finding solution to this. I tried searching blog but to no avail. I may be doing something naive here. Any help greatly appreciated.

推荐答案

最后，我使它工作了。它一定是Microsoft中的错误，否则它们可能会从ApiController的.net core 2.1更改工作方式。

Finally I made it Working. It must be a bug in microsoft or they may have change the way things works from .net core 2.1 for ApiController.

我将WebApi方法更改为以下内容，并对此进行了说明

I changed my WebApi method to the following and voila it worked.

注意：删除了ApiController，它起作用了。 Microsoft应该对此进行记录。

Note: removed ApiController and it worked. Microsoft should document this.

[Route("api/[controller]")]
public class OCRController : ControllerBase
 {
    [HttpPost]
    public async Task<IActionResult> Post([FromForm] IFormFile file)
    {
    }
}

这可能会帮助像我一样挣扎的人。

It may help someone who is struggling like me.

这篇关于从控制台应用程序接收文件时，IFormFile始终为null的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！