c# 读入文本文件实用代码

 /// <summary>
        /// 读入文件文本
        /// </summary>
        /// <param name="txtfile">文件名</param>
        /// <returns></returns>
        public string Read(string txtfile)
        {
            //文件路径
            string filePath = System.AppDomain.CurrentDomain.BaseDirectory + txtfile;
            string str = "";
            try
            {
                if (File.Exists(filePath))
                {
                    str = File.ReadAllText(filePath);
                    // byte[] mybyte = Encoding.UTF8.GetBytes(textBox1.Text);
                    //textBox1.Text = Encoding.UTF8.GetString(mybyte);
                }
            }
            catch (Exception ex)
            {
                // MessageBox.Show(ex.Message);
            }
            return str;
        }