public async Task ReadAsync(IStorageFileInfo fileInfo, Stream writeStream, CancellationToken cancellationToken = default)
{
fileInfo.NotNull(nameof(fileInfo));
writeStream.NotNull(nameof(writeStream));
var buffer = new byte[Options.BufferSize];
if (writeStream.CanSeek)
{
writeStream.Seek(0, SeekOrigin.Begin);
}
using (var readStream = fileInfo.CreateReadStream())
{
var currentCount = 1;
while (currentCount > 0)
{
// 每次从文件流中读取指定缓冲区的字节数，当读完后退出循环
currentCount = await readStream.ReadAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait();
// 将读取到的缓冲区字节数写入请求流
await writeStream.WriteAsync(buffer, 0, currentCount, cancellationToken).ConfigureAwait();
if (ProgressAction.IsNotNull())
{
var descriptor = new StorageProgressDescriptor(
readStream.Length, readStream.Position,
writeStream.Length, writeStream.Position, currentCount);
ProgressAction.Invoke(descriptor);
}
}
}
}
public Task <string> ReadStringAsync(IStorageFileInfo fileInfo)
{
fileInfo.NotNull(nameof(fileInfo));
using (var readStream = fileInfo.CreateReadStream())
using (var sr = new StreamReader(readStream))
{
return(sr.ReadToEndAsync());
}
}
public Task WriteStringAsync(IStorageFileInfo fileInfo, string content)
{
fileInfo.NotNull(nameof(fileInfo));
content.NotEmpty(nameof(content));
using (var readStream = fileInfo.CreateReadStream())
using (var sw = new StreamWriter(readStream))
{
return(sw.WriteAsync(content));
}
}