文本文件的读写

// 读文件public TextWriter w;// 写文件public TextReader r;// 读文本文件private void button1_Click(object sender, System.EventArgs e){if(openFileDialog1.ShowDialog() == DialogResult.OK){textBox1.Text = openFileDialog1.FileName; r = new StreamReader(openFileDialog1.FileName, System.Text.Encoding.Default, false, 512);//用当前默认的编码方式读取，否则将会出现乱码；richTextBox1.Text = r.ReadToEnd();r.Close();}}// 写文本文件private void button2_Click(object sender, System.EventArgs e){if(saveFileDialog1.ShowDialog() == DialogResult.OK){textBox1.Text = saveFileDialog1.FileName; w = new StreamWriter(saveFileDialog1.FileName, false,System.Text.Encoding.Default , 512);w.Write(richTextBox1.Text);w.Flush();w.Close();}}