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StreamWriter sw = new StreamWriter("t.txt");
using (StreamReader sr = new StreamReader("test.txt", Encoding.Default))//系统读写文件方法
{
string s = "";
while ((s = sr.ReadLine()) != null )
{
string news=s.Replace("11", "33");
sw.Write(news);
sw.WriteLine();
}
sr.Close();
}
sw.Close();