MVC 控制器在尝试使用 Axios 发送带有 FormData 的 POST 时收到空数据

Question

I don't seem to be able to find out why my controller receives null data. I am able to reach the controller, but no data is transmitted. Everything works fine at the controller end when I am using Postman to test the API with Body and with correct key/data content.

My controller method:

[Route("home/api/files")]
public class FileController : ControllerBase
{
  [HttpPost]
  public async Task<IActionResult> Post([FromForm] FileModel file)
  {
    if (file == null)
      return BadRequest("Given data is null");
    if (string.IsNullOrEmpty(file.Name))
      return BadRequest("File name is undefined");
    if (string.IsNullOrEmpty(file.FolderPath))
      return BadRequest("FolderPath is undefined");
    if (file.File.Length < 0)
      return BadRequest("File content is empty");
    ...
  }
}

The FileModel:

public class FileModel
{
  public string Name { get; set; }
  public string Extension { get; set; }
  public string FolderPath { get; set; }
  public IFormFile File { get; set; }
}

And the client-side Axios call:

export function uploadFile(folderPath, data) {
  console.log("upLoadFile", folderPath, data);

  const formData = new FormData();
  formData.set('name', data.file);
  formData.set('extension', data.extension);
  formData.set('folderPath', folderPath);
  formData.append('file', data);

  return axios.post(
    "api/files",
    formData,
    { headers: { 'Content-Type': 'multipart/form-data}' }})
    //{ headers: { 'Content-Type': 'multipart/form-data; boundary=${form._boundary}' }})
    .then((response) => {
      console.log(response.data);
      console.log(response.status);
    })
    .catch((error) => {
      console.log(error);
    });
}

I assume the issue lies somewhere with the data types I am sending? Particularly, with the FileModel s File property type IFormFile . All ideas are welcomed!

The used version of Axios 0.19.2

Answer 1

I believe the main problem was related to the data types with my initial try. It is important that the given data is in the right format/type.

Defining the data properly as following helped:

const file = new Blob([data.contents], { type: 'text/csv' });

const formData = new FormData();
formData.set('Name', data.file);
formData.set('Extension', data.extension);
formData.set('FolderPath', folderPath);
formData.append('File', file);

const requestConfig = {
    headers: {
    "Content-Type": "multipart/form-data"
  }
};

when formData is defined as above, the following Axios POST works out without issues or changes to the controller, [FromForm] works as expected.

return axios.post(
  "api/files",
  formData,
  requestConfig)
.then((response) => {
  console.log(response.data);
})
.catch((error) => {
  console.log(error);
});