如何同时读取和写入文本文件.

问题描述

你好，
如何同时读取和写入文本文件.

我有以下代码，但问题是它确实写在文件内容的末尾.但我希望它写在两个"之后.即，如果读取的行包含两个"，则在两个"之后写测试".

Hello,
How can i read and write a text file at the same time.

I have the following code but the problem is that it does writes at the end of the file contents. but i want it to write at after "two". i.e. if the read line contains "two" then write "test" after "two".

FileStream fsrw = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite);
StreamReader sr = new StreamReader(fsrw);
StreamWriter sw = new StreamWriter(fsrw);
test = "Dummy";

 while (test != null)
{
 if (test.Contains("two"))
    {
    sw.Write("test");
    }
    test = sr.ReadLine();
}
sw.Close();
}

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