UWP:异步读取文件到字节 [] [英] UWP: async read file into byte[]

问题描述

我想将本地存储的文件读入字节数组.我怎么做?这是我的尝试:

I want to read a locally stored file into a byte array. How do I do that? This is my try:

StorageFolder folder = await StorageFolder.GetFolderFromPathAsync(filePath);
var file = await folder.GetFileAsync(filePath);
var buffer = await FileIO.ReadBufferAsync(file);
DataReader dataReader = Windows.Storage.Streams.DataReader.FromBuffer(buffer);
// doesn't work because ReadBytes wants a byte[] as parameter and also isn't asynchronous
byte[] result = dataReader.ReadBytes(buffer.Length);

推荐答案

        StorageFolder storageFolder = ApplicationData.Current.LocalFolder;
        StorageFile sampleFile = await storageFolder.GetFileAsync(FILE_NAME);

        byte[] result;
        using (Stream stream = await sampleFile.OpenStreamForReadAsync())
        {
            using (var memoryStream = new MemoryStream())
            {

                stream.CopyTo(memoryStream);
                result = memoryStream.ToArray();
            }
        }

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