C# 如何在Windows运行时将流写入文件?
有很多问题,但主要是关于将字符串写入文件。我有点糊涂了 将流写入文件的正确方式是什么? 我所做的:C# 如何在Windows运行时将流写入文件?,c#,windows-phone-8,windows-runtime,windows-store-apps,windows-phone-8.1,C#,Windows Phone 8,Windows Runtime,Windows Store Apps,Windows Phone 8.1,有很多问题,但主要是关于将字符串写入文件。我有点糊涂了 将流写入文件的正确方式是什么? 我所做的: Stream stream = await GetStream(source); var file = await ApplicationData.Current.TemporaryFolder.CreateFileAsync("TempUsersFile", CreationCollisionOption.ReplaceExisting); var fileStream = await fil
Stream stream = await GetStream(source);
var file = await ApplicationData.Current.TemporaryFolder.CreateFileAsync("TempUsersFile", CreationCollisionOption.ReplaceExisting);
var fileStream = await file.OpenAsync(FileAccessMode.ReadWrite);
using (var dataWriter = new Windows.Storage.Streams.DataWriter(fileStream))
{
// How can I write to buffer and write to the file
}
我建议使用StreamReader和StreamWriter类:
StreamWriter sw = new StreamWriter(outstream);
StreamReader sr = new StreamReader(instream);
while (!sr.EndOfStream)
{
int ch = sr.Read();
sw.Write(ch);
}
将流写入文件的方法有很多,它们也取决于您的需要。下面的方法使用指定的缓冲区执行异步操作:
public async Task SaveStreamToFile(Stream streamToSave, string fileName, CancellationToken cancelToken)
{
StorageFile file = await ApplicationData.Current.TemporaryFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
using (Stream fileStram = await file.OpenStreamForWriteAsync())
{
const int BUFFER_SIZE = 1024;
byte[] buf = new byte[BUFFER_SIZE];
int bytesread = 0;
while ((bytesread = await streamToSave.ReadAsync(buf, 0, BUFFER_SIZE)) > 0)
{
await fileStram.WriteAsync(buf, 0, bytesread);
cancelToken.ThrowIfCancellationRequested();
}
}
}
我还实现了一个,以防需要取消长时间运行的任务