很急啊，大侠们帮改一下。


OpenFileDialog ofd = new OpenFileDialog();

            if (ofd.ShowDialog() == DialogResult.OK)
            {

                string fname = ofd.FileName;
                StreamReader sr = new StreamReader(fname, UnicodeEncoding.GetEncoding("gb2312"));

                //开始读取

                string read;

                while ((read = sr.ReadLine()) != null)
                {
                    sr = new StreamReader(ofd.FileName, System.Text.Encoding.Unicode);
                    textBox1.Text = sr.ReadToEnd();
                    //要执行的操作

                }


            }

把 sr = new StreamReader(ofd.FileName, System.Text.Encoding.Unicode);
改为： sr = new StreamReader(ofd.FileName, System.Text.Encoding.Default);



可是保存文件又出问题了：
SaveFileDialog savedlg = new SaveFileDialog();
            savedlg.Filter = "Text File(*.txt)|*.txt";
            savedlg.FilterIndex = 1;
            savedlg.RestoreDirectory = true;
            StreamReader sw = null;
            if (savedlg.ShowDialog ()== DialogResult.OK)
            {
                sw = new StreamWriter(savedlg.FileName, false, System.Text.Encoding.Default);
                sw.Write(textBox1.Text);

            }
            sw.Close();

调试时出现：
错误    1    无法将类型“”隐式转换为“”    G:\c#体验\文本文件\文本文件\Form1.cs    72    22    文本文件
错误    2    “”并不包含“Write”的定义    G:\c#体验\文本文件\文本文件\Form1.cs    73    20    文本文件