Request.Form.Files‘在asp.net核心2.2中引发类型为'system.invalidoperationexception’的异常，内容类型为‘asp.net-json’不正确

// 使用Fetch API发送文件上传请求
const formData = new FormData();
formData.append('file', fileInput.files[0]);

fetch('/upload', {
    method: 'POST',
    body: formData
});

[HttpPost("upload")]
public async Task<IActionResult> UploadFile()
{
    if (Request.Form.Files.Count > 0)
    {
        var file = Request.Form.Files[0];
        var uploads = Path.Combine(_environment.WebRootPath, "uploads");
        if (!Directory.Exists(uploads))
        {
            Directory.CreateDirectory(uploads);
        }
        using (var fileStream = new FileStream(Path.Combine(uploads, file.FileName), FileMode.Create))
        {
            await file.CopyToAsync(fileStream);
        }
        return Ok(new { message = "File uploaded successfully." });
    }
    else
    {
        return BadRequest("No file uploaded.");
    }
}

[HttpPost("upload")]
public async Task<IActionResult> UploadFile()
{
    if (Request.ContentType != "multipart/form-data")
    {
        return BadRequest("Content-Type must be multipart/form-data");
    }

    // 处理文件上传的逻辑...
}