无法使用二进制文件写入文件

Question

Why does this code not write my string to the file:

 string file = "Myfile.txt";
        MemoryStream ms = new MemoryStream();

void writeToFile(string text)
        {
            System.Text.ASCIIEncoding  encoding=new System.Text.ASCIIEncoding();
            byte[] barr = encoding.GetBytes(text);


            ms.Write(barr, 0, barr.Length);

            using (FileStream fs = new FileStream(file, FileMode.OpenOrCreate))
            {
                using (BinaryWriter bw = new BinaryWriter(ms))
                {
                    bw.Write(ms.ToArray());
                }
            }
        }


        static void Main(string[] args)
        {

            Program p = new Program();

            p.writeToFile("Tony Test");

            Console.ReadLine();

        }

Answer 1

Look at this line:

using (BinaryWriter bw = new BinaryWriter(ms))

You're writing back to the MemoryStream . You want:

using (BinaryWriter bw = new BinaryWriter(fs))

Having said that, this is a pretty nasty way of writing to a file, with all kinds of unnecessary steps. Hopefully this was just experimentation trying to work out why something else wasn't working - but if your real code is actually like this, please give details of what you're trying to do and we can help you tidy it up.

Answer 2

You are using the MemoryStream ms for both input and output. Change the line

using (BinaryWriter bw = new BinaryWriter(ms))

to

using (BinaryWriter bw = new BinaryWriter(fs))

Answer 3

或者：

File.WriteAllText("myfile", "mytext");

Answer 4

You are writing to text wtih the hardest way possible. you should use File.WriteAllText (as Adam says) or Append text method. If you want to use a writer with special encoding than you should use StreamWriter, since it works with text data and you can set the Encoding of the file.