c# – 需要双重冲洗吗？

发布时间：2020-12-15 04:33:22 所属栏目：百科来源：网络整理

导读：刷新StreamWriter后是否需要刷新流？ public static async Task WriteStringAsync(this Stream stream,string messageString){ var encoding = new UTF8Encoding(false); //no BOM using (var streamWriter = new StreamWriter(stream,encoding)) { await st

刷新StreamWriter后是否需要刷新流？

public static async Task WriteStringAsync(this Stream stream,string messageString)
{
        var encoding = new UTF8Encoding(false); //no BOM
        using (var streamWriter = new StreamWriter(stream,encoding))
        {
            await streamWriter.WriteAsync(messageString);
            await streamWriter.FlushAsync();
        }
        await stream.FlushAsync(); //is this necessary?
}

解决方法

根据MSDN文档,这可以被原谅为“只是确保”……

StreamWriter.Flush()：

Clears all buffers for the current writer and causes any buffered data to be written to the underlying stream.

Stream.Flush()：

When overridden in a derived class,clears all buffers for this stream and causes any buffered data to be written to the underlying device.

…但是,仔细查看TypeDescriptor中的代码会显示StreamWriter.Flush()(我假设它的异步对应FlushAsync)是一个调用主函数的重载,传递两个布尔参数,指示StreamWriter刷新Stream和Unicode编码器也是如此.因此,一次调用StreamWriter.FlushAsync(),再加上await关键字以确保完全发生异步操作,应该没问题.

（编辑：李大同）

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