如何从MVC控制器提供要下载的文件？

public FileResult DownloadFile()
{
    // 获取文件内容
    byte[] fileBytes = System.IO.File.ReadAllBytes("path/to/your/file.ext");

    // 设置响应头
    Response.Clear();
    Response.ContentType = "application/octet-stream";
    Response.AddHeader("Content-Disposition", "attachment; filename=file.ext");
    Response.AddHeader("Content-Length", fileBytes.Length.ToString());

    // 将文件内容写入响应流
    Response.BinaryWrite(fileBytes);
    Response.Flush();

    // 返回FileResult
    return File(fileBytes, "application/octet-stream", "file.ext");
}

@Html.ActionLink("下载文件", "DownloadFile", "YourControllerName")