如何在C#中读写文件

Question

我想要读取和写入文件.这不起作用.

static void Main(string[] args)
{
    StreamReader sr = new StreamReader(@"C:\words.txt");
    StreamWriter sw = new StreamWriter(@"C:\words.txt");
}

我如何在C#中读取和写入文件？

Answer 1

您需要一个单独的流,为读取和写入打开.

FileStream fileStream = new FileStream(
      @"c:\words.txt", FileMode.OpenOrCreate, 
      FileAccess.ReadWrite, FileShare.None);

Answer 2

不要忘记简单的路线:

    static void Main(string[] args)
    {
        var text = File.ReadAllText(@"C:\words.txt");
        File.WriteAllText(@"C:\words.txt", text + "DERP");
    }

Answer 3

var fs = File.Open("file.name", FileMode.OpenOrCreate, FileAccess.ReadWrite);
var sw = new StreamWriter(fs);
var sr = new StreamReader(fs);

...

fs.Close();
//or sw.Close();

关键是用FileAccess.ReadWrite标志打开文件.然后,您可以使用初始FileStream创建所需的任何Stream/String/Binary Reader/Writers.