.NET MAUI：如何按文件名从相册读取图片为流

场景说明 #

我正在开发一款应用，功能是通过相机拍摄图片并存储，最终将这些图片上传至服务器。目前卡在按文件名从相册读取图片并转换为Stream的功能上，查了资料没找到确切方案，需要针对特定平台实现该功能。

当前代码 #

private async Task UploadSurveryFiles()
{
    var assembly = GetType().GetTypeInfo().Assembly;
    var files = new string[1] { "IMG_20230511_201420.jpg" }; //TODO: delete

    foreach (var file in files)
    {
       //调试显示图片已加载
       var imageSource = ImageSource.FromFile(file);
        
       //此处需将imageSource转换为Stream

        if (!imageSource.IsEmpty)
            continue;

        var isImageUploaded = await UploadFileToAWS3(file, stream);

        //TODO: 更新数据库中图片的上传标记
    }
}

private async Task<bool> UploadFileToAWS3(string uploadedFileName, Stream stream)
{
    var selfSignedUrl = await GetSelfSignedUrlForImageUpload(uploadedFileName);

    var result = await UploadFile(selfSignedUrl.UploadURL, new StreamContent(stream));

    return result;
}

private async Task<SelfSignedUrlForImageUploadResponse> GetSelfSignedUrlForImageUpload(string fileName)
{
    var endpoint = $"{settings.FileUploadURL}{entity.Project.Id}/{fileName}";

    var response = await SendGetRequestAsync<SelfSignedUrlForImageUploadResponse>(endpoint);

    return response;
}

额外疑问 #

我还有个想法：把拍摄后的图片以Base64格式存储到应用数据目录，这算不算良好的开发实践？

内容的提问来源于stack exchange，提问作者Wasyster