返回StreamReader的到开始 [英] Return StreamReader to Beginning

问题描述

我读的行由行的文件，我希望能够重新开始读通过调用一个方法倒带（）。

I'm reading a file in line-by-line and I want to be able to restart the read by calling a method Rewind().

如何操作我的就是System.IO.StreamReader 和/或它的基本 System.IO.FileStream 来与读取文件开始？

How can I manipulate my System.IO.StreamReader and/or its underlying System.IO.FileStream to start over with reading the file?

我得到了巧妙的主意，用 FileStream.Seek（长，SeekOffset）走动的文件，但没有任何效果的包围就是System.IO.StreamReader 。我可以关闭（）并重新分配这两个流和读者referecnes，但我希望有一个更好的办法。

I got the clever idea to use FileStream.Seek(long, SeekOffset) to move around the file, but it has no effect the enclosing System.IO.StreamReader. I could Close() and reassign both the stream and the reader referecnes, but I'm hoping there's a better way.

推荐答案

您需要寻求在流，像你一样，然后调用 DiscardBufferedData 在的StreamReader 。文档<一href="http://msdn.microsoft.com/en-us/library/system.io.streamreader.discardbuffereddata.aspx">here:

You need to seek on the stream, like you did, then call DiscardBufferedData on the StreamReader. Documentation here:

编辑：添加code例如：

Adding code example:

Stream s = new MemoryStream();
StreamReader sr = new StreamReader(s);
// later... after we read stuff
s.Position = 0;
sr.DiscardBufferedData();        // reader now reading from position 0

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