读取后无法写入文件

问题描述

在以下代码中，我收到错误stream 不可写":

In the following code I get the error "stream was not writable":

class Class1
{
    private static void Main()
    {
        FileStream fs = new FileStream("C:\fFile.txt",
                              FileMode.OpenOrCreate,
                              FileAccess.ReadWrite,
                              FileShare.ReadWrite);

        StreamReader r = new StreamReader(fs);
        string t = r.ReadLine();
        r.Close();
        Console.WriteLine(t);

        StreamWriter w = new StreamWriter(fs);
        w.WriteLine("string");
        w.Flush();
        w.Close();
        fs.Close();

    }
}

错误发生在这一行 StreamWriter w = new StreamWriter(fs);

这是为什么?

推荐答案

来自 msdn

关闭 StreamReader 对象和底层流，并释放与读取器关联的所有系统资源.

因此您尝试写入的流无效，您需要重新打开流并重新打开文件.

So the stream you try to write to is invalid you need to reopen the stream and reopen the file.

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