文件保存

/// <summary>
        /// 保存文档
        /// </summary>
        /// <param name="txt"></param>
        /// <param name="filename"></param>
        public void Save(string txt, string filename)
        {
            if (txt != string.Empty)
            {
                System.Windows.Forms.SaveFileDialog saveFile = new System.Windows.Forms.SaveFileDialog();
                saveFile.Filter = "文本文件(*.txt)|*.txt";
                saveFile.DefaultExt = "txt";
                saveFile.FileName = filename;
                if (saveFile.ShowDialog(this) == DialogResult.OK)
                {
                    string saveFilePath = saveFile.FileName;//定义保存的文件路径
                    using (StreamWriter sw = File.CreateText(saveFilePath))
                    {
                        sw.Write(txt);
                        sw.Close();

                    }
                }
            }
        }