请问为什么在保存csv文件的时候为乱码(英文可以正常显示,中文为乱码)?


            try
            {
                string[] a ={ "一", "二", "3", "4" };
                string fileName;
                SaveFileDialog savFile = new SaveFileDialog();
                savFile.CheckPathExists = true;
                savFile.CheckPathExists = true;
                savFile.CreatePrompt = false;
                savFile.OverwritePrompt = true;
                savFile.ValidateNames = true;
                savFile.FileName = "*.csv";
                savFile.Filter = "所有文件(*.*)|*.*";
                savFile.FilterIndex = 1;
                if (savFile.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    fileName = savFile.FileName;
                    using (StreamWriter sw = new StreamWriter(fileName, encoding.))
                    {
                        for (int i = 0; i < a.Length; i++)
                        {
                            sw.WriteLine(a[i]);
                        }
                    }
                }
            }