使用IFormFile通过JS将文件上传到ASP.Net内核

<input type="file" id="fileInput">

var fileInput = document.getElementById('fileInput');
var file = fileInput.files[0];
var formData = new FormData();
formData.append('file', file);

// 发送文件到后端API
var xhr = new XMLHttpRequest();
xhr.open('POST', '/api/upload');
xhr.send(formData);

[HttpPost]
[Route("api/upload")]
public async Task<IActionResult> Upload(IFormFile file)
{
    if (file != null && file.Length > 0)
    {
        // 保存文件到服务器上的指定位置
        var filePath = Path.Combine("uploads", file.FileName);
        using (var stream = new FileStream(filePath, FileMode.Create))
        {
            await file.CopyToAsync(stream);
        }
        return Ok("文件上传成功！");
    }
    else
    {
        return BadRequest("未选择文件或文件为空！");
    }
}