ios - PCLStorage 和二进制数据

Question

我只是这个 PCL 库的新手，我正在使用 Xamarin 开发 iPhone 应用程序，但找不到将其保存在手机上的方法。我得到的最接近的是 PCLStorage，但他只保存文本。还有另一种方法可以用其他程序保存二进制文件。谢谢。

foreach (images element in json_object)
{
            //var nameFile = Path.Combine (directoryname, element.name);
            try{
                IFile file = await folder_new.GetFileAsync(element.name);
            }catch(FileNotFoundException ex ){
                RestClient _Client = new RestClient(element.root);
                RestRequest request_file = new RestRequest("/images/{FileName}");
                request_file.AddParameter("FileName", element.name, ParameterType.UrlSegment);
                _Client.ExecuteAsync<MemoryStream>(
                        request_file,
                        async Response =>
                        {
                                if (Response != null)
                                {
                                    IFolder rootFolder_new = FileSystem.Current.LocalStorage;
                                    IFile file_new = await rootFolder_new.CreateFileAsync(element.name,CreationCollisionOption.ReplaceExisting);
                                    await file_new.WriteAllTextAsync(Response.Data);
                                }
                        });
            }
        }

Answer 1

使用 IFile.OpenAsync 方法获取可用于读取/写入二进制数据的流。以下是读取文件的方式:

IFile file = await folder_new.GetFileAsync(element.name);
using (Stream stream = await file.OpenAsync(FileAccess.Read))
{
    //  Read stream and process binary data from it...

}