記錄C#常用的程式碼片段

標籤：toe   exists   圖片路徑   結果   eth   bsp   ==   bmp   content   

　　時間一久，常用的代碼會有點忘記，還是貼在這裡方便尋找！

1、將資訊寫入檔案中

//將字串寫入到文本中        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、儲存Bitmap圖片對象到本地， 或者儲存圖片位元組數組到本地

/// <summary>        /// 儲存圖片到本地        /// </summary>        /// <param name="bmp"></param>        /// <returns>返回圖片名字</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>        /// 儲存圖片位元組數組到本地        /// </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>        /// 擷取本地圖片路徑        /// </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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3、網路請求: 傳入json字串，網路請求獲得返回結果

/// <summary>        /// post請求        /// </summary>        /// <param name="url">請求伺服器介面</param>        /// <param name="paramString">參數字串</param>        /// <param name="result">伺服器返回結果字串</param>        /// <returns></returns>        public static bool HttpPostRequest(string url, string paramString, ref string result)        {            HttpWebRequest request = null;                       //如果是發送HTTPS請求              if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))            {                //ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);                request = WebRequest.Create(url) as HttpWebRequest;                //request.ProtocolVersion = HttpVersion.Version10;            }            else            {                request = WebRequest.Create(url) as HttpWebRequest;            }            request.Method = "POST";            request.ContentType = "application/json;charset=utf-8";            //request.Headers.Add("Authorization", User.currentUser.token);            request.Headers.Add("Accept-Encoding", "gzip");            //設定代理UserAgent和逾時            //request.UserAgent = userAgent;            //request.Timeout = timeout;             //發送POST資料              byte[] data = Encoding.UTF8.GetBytes(paramString);            using (Stream stream = request.GetRequestStream())            {                stream.Write(data, 0, data.Length);            }            HttpWebResponse response;            try            {                 response = request.GetResponse() as HttpWebResponse;            }            catch (Exception ex)            {                result = "error: " + ex.Message;                return false;            }                        Stream stream2 = response.GetResponseStream();   //擷取響應的字串流            StreamReader sr = new StreamReader(stream2); //建立一個stream讀取流            result = sr.ReadToEnd();   //從頭讀到尾，讀取json字串            sr.Close();            stream2.Close();            return true;        }

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調用舉例：

string result = "";            string paramsStr = "{\"userName\":\"admin\", \"password\":\"123456\"}";            if (HttpHelper.HttpPostRequest("http://192.168.1.220:5188/user/login/in", paramsStr, ref result))            {                Console.WriteLine("success：" + result);            }            else            {                Console.WriteLine("請求fail：" + result);            }

 

解析json字串為模型對象，引用Newtonsoft庫

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

 

string jsonStr = "{\"code\":\"0000\", \"data\":{\"name\":\"xxx\", \"age\":\"xxx\"}, \"msg\":\"xxxxx\"}";            JObject obj = JObject.Parse(jsonStr);            string code = obj["code"].ToString();            if (code.Equals("0000"))            {                string dataStr = obj["data"].ToString();                Dictionary<string, string> dataDict = JsonConvert.DeserializeObject<Dictionary<string, string>>(dataStr);                //...            }

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記錄C#常用的程式碼片段