c# - 使用 web api HttpResponseMessage 输出图像

Question

我正在尝试使用以下代码从 asp.net web api 输出图像，但响应正文长度始终为 0。

public HttpResponseMessage GetImage()
{
    HttpResponseMessage response = new HttpResponseMessage();
    response.Content = new StreamContent(new FileStream(@"path to image"));
    response.Content.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg");

    return response;
}

有什么建议吗？

作品:

    [HttpGet]
    public HttpResponseMessage Resize(string source, int width, int height)
    {
        HttpResponseMessage httpResponseMessage = new HttpResponseMessage();

        // Photo.Resize is a static method to resize the image
        Image image = Photo.Resize(Image.FromFile(@"d:\path\" + source), width, height);

        MemoryStream memoryStream = new MemoryStream();

        image.Save(memoryStream, ImageFormat.Jpeg);

        httpResponseMessage.Content = new ByteArrayContent(memoryStream.ToArray());

        httpResponseMessage.Content.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg");
        httpResponseMessage.StatusCode = HttpStatusCode.OK;

        return httpResponseMessage;
    }

Answer 1

以下内容:

1. 确保路径正确(duh)

2. 确保您的路线正确。您的 Controller 是 ImageController，或者您定义了自定义路由以支持其他 Controller 上的“GetImage”。(你应该得到一个 404 响应。)

3. 确保打开流:

   var stream = new FileStream(path, FileMode.Open);

我尝试了类似的东西，它对我有用。