c#做记事本,怎么打开正常的txt文件会出错

,自己通过那记事本保存的文档再打开可以,但是用window的记事本打开用那记事本保存的文件是乱码  打开,保存代码如下

        //打开文件  
        private void openToolStripMenuItem_Click_1(object sender, EventArgs e)
        {
            OpenFileDialog open = new OpenFileDialog();
            DialogResult result = open.ShowDialog();
            if (result == DialogResult.OK)
            {
                fileName = open.FileName;
                open.Filter = "Text(*.txt)|*.txt|RichText(*.rtf)|*.rtf|所有文件|*.*";
                richTextBox.LoadFile(fileName);
            }
        //保存文件
        private void saveFileToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (fileName == null)
            {
                SaveFileDialog dialog = new SaveFileDialog();
                dialog.Filter = "Text(*.txt)|*.txt|RichText(*.rtf)|*.rtf|所有文件|*.*";
                DialogResult result = dialog.ShowDialog();
            
                if (result == DialogResult.OK)
                {
                    fileName = dialog.FileName;
                    richTextBox.SaveFile(fileName);

答案：记事本文件，是 plaintext 模式，你的 richtextbox 使用方法有误。正确的代码如下：
 
//打开文件  
        private void openToolStripMenuItem_Click_1(object sender, EventArgs e)
        {
            OpenFileDialog open = new OpenFileDialog();
open.Filter = "Text(*.txt)|*.txt|RichText(*.rtf)|*.rtf|所有文件|*.*";

            DialogResult result = open.ShowDialog();
            if (result == DialogResult.OK)
            {
                fileName = open.FileName;
                richTextBox.LoadFile(fileName, RichTextBoxStreamType.PlainText);
            }

 
//保存文件
        private void saveFileToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (fileName == null)
            {
                SaveFileDialog dialog = new SaveFileDialog();
                dialog.Filter = "Text(*.txt)|*.txt|RichText(*.rtf)|*.rtf|所有文件|*.*";
                DialogResult result = dialog.ShowDialog();
            
                if (result == DialogResult.OK)
                {
                    fileName = dialog.FileName;
                    richTextBox.SaveFile(fileName, RichTextBoxStreamType.PlainText);
               }

其他：应该是文件编码问题
StreamReader srAsciiFromFileFalse = new StreamReader(filename,System.Text.Encoding.GetEncoding("Gb2312"));
先试下GB2312 不行再试别的。

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