c#file类读写

private void button4_Click(object sender, EventArgs e)
{
FileStream fs = File.OpenRead(textBox1.Text);
byte[] buffer = new byte[1024];
int i = fs.Read(buffer, 0, buffer.Length);//把流读进buffer里
while (i > 0)
{
richTextBox1.AppendText(Encoding.GetEncoding("gb2312").GetString(buffer));
i = fs.Read(buffer, 0, buffer.Length);
}
fs.Dispose();
}

private void button5_Click(object sender, EventArgs e)
{
FileStream writeStream = File.OpenWrite(textBox1.Text);
byte[] buffer = Encoding.UTF8.GetBytes(richTextBox1.Text);
writeStream.Write(buffer, 0, buffer.Length);//把buffer写进流里
writeStream.Flush();
writeStream.Dispose();
}

private void wordToolStripMenuItem_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
DialogResult res = ofd.ShowDialog();
if (res == DialogResult.OK)
{
webBrowser1.Navigate(ofd.FileName);//利用WebBrowser控件可以打开很多类型的文件
}
}