记录C#常用的代码片段

　　时间一久，常用的代码会有点忘记，还是贴在这里方便查找！

1、将信息写入文件中

//将字符串写入到文本中
        void writeToText(string msg)
        {
            try
            {
                msg = DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss") + " : " + msg;
                string fileUrl = HttpContext.Server.MapPath("~/unionpayLog.txt");
                
                System.IO.FileStream fs = new System.IO.FileStream(fileUrl, System.IO.FileMode.Append);
                System.IO.StreamWriter sw = new System.IO.StreamWriter(fs);
                sw.WriteLine(msg);
                sw.Close();
                fs.Close();
            }
            catch (Exception ex) { }
        }

 

2、保存Bitmap图片对象到本地， 或者保存图片字节数组到本地

/// <summary>
        /// 保存图片到本地
        /// </summary>
        /// <param name="bmp"></param>
        /// <returns>返回图片名字</returns>
        public static string SaveImageByBitmap(Bitmap bmp)
        {
            if (bmp == null) return "";

            string imgName = Guid.NewGuid().ToString() + ".jpg";
            string localImgPath = LocalImageFolder() + "\\" + imgName;

            using (bmp)
            {
                using (MemoryStream stream = new MemoryStream())
                {
                    bmp.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
                    byte[] bytes = stream.ToArray();

                    FileStream fs = new FileStream(localImgPath, FileMode.Create);
                    BinaryWriter bw = new BinaryWriter(fs);
                    bw.Write(bytes);
                    bw.Close();
                    fs.Close();
                }
            }

            return imgName;
        }

        /// <summary>
        /// 保存图片字节数组到本地
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public static string SaveImageByBytes(byte[] bytes)
        {
            string imgName = Guid.NewGuid().ToString() + ".jpg";
            string localImgPath = LocalImageFolder() + "\\" + imgName;

            FileStream fs = new FileStream(localImgPath, FileMode.Create);
            BinaryWriter bw = new BinaryWriter(fs);
            bw.Write(bytes);
            bw.Close();
            fs.Close();
            return imgName;
        }

        /// <summary>
        /// 获取本地图片路径
        /// </summary>
        /// <returns></returns>
        public static string LocalImageFolder()
        {
            string dirPath = Directory.GetCurrentDirectory() + "\\tempImages";

            if (!Directory.Exists(dirPath))
            {
                Directory.CreateDirectory(dirPath);
            }

            return dirPath;
        }

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