将字节数组写入windows phone中的存储文件

Question

我正在使用Visual Studio 2012,c#,silverlight,windows phone 8 app.

我们从Web服务获取数据,通过Web服务,我们得到一个base64字符串的图片.

我将它转换为字节数组,现在我想保存它以便使用内存流来存储Windows手机？我不知道这是不是正确的做法.我不想将它保存到独立存储,只是本地文件夹,因为我想在一个人点击链接后显示图片.

这就是我到目前为止所拥有的.

 byte[] ImageArray;
 var image = Attachmentlist.Attachment.ToString();
 imagename = Attachmentlist.FileName.ToString();
 ImageArray = Convert.FromBase64String(image.ToString());

 StorageFolder myfolder = Windows.Storage.ApplicationData.Current.LocalFolder;
 await myfolder.CreateFileAsync(imagename.ToString());
 StorageFile myfile = await myfolder.GetFileAsync(imagename.ToString());


 MemoryStream ms = new MemoryStream();

所以在我初始化了内存流后,如何获取字节数组并将其写入存储文件,然后再次检索它？

Answer 1

要将文件写入光盘,请尝试以下代码:

StorageFile sampleFile = await myfolder.CreateFileAsync(imagename.ToString(), 
   CreateCollisionOption.ReplaceExisting);
await FileIO.WriteBytesAsync(sampleFile, ImageArray);

内存流创建在内存中写入的流,因此它不适用于此问题.

Answer 2

        StorageFolder folder = ApplicationData.Current.LocalFolder;
        StorageFile imageFile = await folder.CreateFileAsync("Sample.png", CreationCollisionOption.ReplaceExisting);

        using (IRandomAccessStream fileStream = await imageFile.OpenAsync(FileAccessMode.ReadWrite))
        {
            using (IOutputStream outputStream = fileStream.GetOutputStreamAt(0))
            {
                using (DataWriter dataWriter = new DataWriter(outputStream))
                {
                    dataWriter.WriteBytes(imageBuffer);
                    await dataWriter.StoreAsync();
                    dataWriter.DetachStream();

                }
                //await outputStream.FlushAsync();
            }
            //await fileStream.FlushAsync();
        }