为什么我的流不可读？ [英] Why is my Stream not Readable?
问题描述
这是我的问题的续集这里关于修剪掉一个日志文件中的fat。
This is a sequel to my question here about trimming the fat off a log file.
我有这样的代码：
private readonly FileStream _fileStream;
private readonly StreamWriter _streamWriter;
. . .
const int MAX_LINES_DESIRED = 1000;
string uriPath = GetExecutionFolder() + "\\Application.log";
string localPath = new Uri(uriPath).LocalPath;
if (!File.Exists(localPath))
{
File.Create(localPath);
}
_fileStream = File.OpenWrite(localPath);
// First, remove the earliest lines from the file if it's grown too much
StreamReader reader = new StreamReader(_fileStream);
. . .
最后一行显示失败：
Which fails on the last line shown with:
System.ArgumentException was unhandled
_HResult=-2147024809
_message=Stream was not readable.
为什么不可读？我想也许是因为这个文件是空的，但是我添加了一行，并且仍然得到相同的错误信息。
Why is it not readable? I thought maybe because the file was empty, but I added a line to it, and still get the same err msg.
推荐答案
File.OpenWrite 创建一个不可读的流。如果您要读取和写入流，您需要使用 File.Open（localPath，FileMode.Open，FileAccess.ReadWrite）。
File.OpenWrite creates a non-readable stream. If you're going to be reading and writing to the stream, you need to use File.Open(localPath, FileMode.Open, FileAccess.ReadWrite).
另外，你可以使用 FileMode.OpenOrCreate ，这样就不需要你的 File。存在条件。
Additionally, you can just use FileMode.OpenOrCreate, and that will remove the need for your File.Exists conditional.
这篇关于为什么我的流不可读？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
