从服务器下载映像并进行转换

Question

我想从服务器下载图像并显示出来。我得到标题类型图像/png作为现在如何转换为图像？

我得到了头像：

缓存-控制:公共，最大年龄=86400连接:保持活动日期:2018年11月30日12:32:08格林尼治时间保持活动: timeout=5，max=99 OkHttp-接收-Millis: 1543581128745 OkHttp-Selected-协议:http/1.1OkHttp-发送-Millis: 1543581128514 Server: Apache/2.4.33 (亚马逊) OpenSSL/1.0.2k-fips PHP/7.0.30 X-由以下驱动: PHP/7.0.30内容长度: 26190内容类型:图像/png保持活动: timeout=5，max=99 OkHttp-接收-Millis: 1543581128745 OkHttp-选择-协议:http/1.1Okhttp-发送-Millis: 1543581128514 X供电-By: PHP/7.0.30 }

 public async Task<AvatarModel> GetAvatar(string dpi, Int64 uin)
    {
        var response = await BasicRequestAsync(string.Format(AVATAR_URL, dpi, uin), HttpMethod.Get, true, null, null, false);

        if(response == null) return null;

        var stream = await response.Content.ReadAsStreamAsync();
        .....
    }

Serwer:标题：

IMToken: 123123123 uin: 123 用户代理：.

返回带有标题内容类型: image/png的未打包映像。

 public class AvatarModel
{
    public AvatarModel() { }

    public AvatarModel(AvatarResponseModel model)
    {
        Id = model.Id;
        Base64 = model.Base64;
    }

    public Int64 Id { get; set; }

    private string base64;
    public string Base64
    {
        get { return base64; }
        set
        {
            base64 = value;

            AvatarImage = Xamarin.Forms.ImageSource.FromStream(
                () => new MemoryStream(Convert.FromBase64String(base64)));
        }
    }

    public ImageSource AvatarImage { get; set; }
}

  public class AvatarResponseModel
    {
        [JsonProperty("Id")]
        public Int64 Id { get; set; }

        [JsonProperty("base64")]
        public string Base64 { get; set; }
    }

Answer 1

我做了那样的事，但我不知道它是否好？

 public async Task<Image> GetAvatar(string dpi, Int64 uin)
        {
            var response = await BasicRequestAsync(string.Format(AVATAR_URL, dpi, uin), HttpMethod.Get, true, null, null, false);

            if(response == null) return null;

            var stream = await response.Content.ReadAsByteArrayAsync();

            Image image = new Image();

            image.Source = ImageSource.FromStream(() => new MemoryStream(stream));

            return image;
        }