[HttpGet]
[Route("api/image")]
public HttpResponseMessage GetImage()
{
    // 创建MemoryStream并写入图像数据
    using (MemoryStream ms = new MemoryStream())
    {
        // 这里可以是生成图像或从数据库/其他来源获取图像
        // 示例：创建一个简单的位图
        Bitmap bmp = new Bitmap(200, 200);
        using (Graphics g = Graphics.FromImage(bmp))
        {
            g.Clear(Color.White);
            g.DrawString("Hello World", new Font("Arial", 20), Brushes.Black, 10, 10);
        }
        
        // 将图像保存到MemoryStream
        bmp.Save(ms, ImageFormat.Png);
        
        // 重置流位置
        ms.Seek(0, SeekOrigin.Begin);
        
        // 创建响应
        HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
        response.Content = new StreamContent(ms);
        response.Content.Headers.ContentType = new MediaTypeHeaderValue("image/png");
        response.Content.Headers.ContentLength = ms.Length;
        
        return response;
    }
}

[HttpGet]
[Route("api/image/{id}")]
public HttpResponseMessage GetImageFromDb(int id)
{
    // 假设从数据库获取图像字节数组
    byte[] imageData = GetImageDataFromDatabase(id);
    
    if (imageData == null || imageData.Length == 0)
    {
        return new HttpResponseMessage(HttpStatusCode.NotFound);
    }
    
    using (MemoryStream ms = new MemoryStream(imageData))
    {
        HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
        response.Content = new StreamContent(ms);
        response.Content.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg"); // 根据实际类型调整
        return response;
    }
}

[HttpGet("image/{id}")]
public IActionResult GetImage(int id)
{
    byte[] imageData = GetImageDataFromDatabase(id);
    
    if (imageData == null || imageData.Length == 0)
    {
        return NotFound();
    }
    
    return File(imageData, "image/jpeg");
}