常见.NET成效代码汇总

②叁,获取和安装分级缓存

收获缓存:首先从本土缓存获取,若是没有,再去读取分布式缓存
写缓存:同时写本地缓存和分布式缓存

  private static T GetGradeCache<T>(string key) where T:struct 
        {
            MemoryCacheManager localCache = MemoryCacheManager.Instance;
            if (!localCache.IsSet(key))
            {
                //本地不存在此缓存
               T  remoteValue = MemCacheManager.Instance.Get<T>(key);
               if (!ValueType.Equals(remoteValue, default(T)))
               { 
                    //如果远程有
                   localCache.Set(key, remoteValue, 1); 
               }
               else
               {
                   localCache.SetFromSeconds(key, default(T), 10); 
               }
               return remoteValue;
            }
            T value = localCache.Get<T>(key);
            return value;
        }

        private static void SetGradeCache<T>(string key,T Value,int time) where T : struct 
        {
            MemoryCacheManager localCache = MemoryCacheManager.Instance;
            localCache.Remove(key);
            localCache.Set(key, Value, time);
            MemCacheManager.Instance.Remove(key);
            MemCacheManager.Instance.Set(key, Value, time); 
        }

二四,求相对目录的相对路线

突发性,大家需须求相对于当下根目录的相对目录,比如将日志文件存储在站点目录之外,大家能够动用
../logs/ 的点子:

 string vfileName = string.Format("../logs/{0}_{1}_{2}.log", logFileName, System.Environment.MachineName, DateTime.Now.ToString("yyyyMMdd"));
            string rootPath = HttpContext.Current.Server.MapPath("/");
            string targetPath = System.IO.Path.Combine(rootPath, vfileName);
            string fileName = System.IO.Path.GetFullPath(targetPath);
            string fileDir = System.IO.Path.GetDirectoryName(fileName);
            if (!System.IO.Directory.Exists(fileDir))
                System.IO.Directory.CreateDirectory(fileDir);

以此代码会在站点目录之外的日记目录,建立一个代机器名称的根据日期区分的日志文件。

二五,多次尝试写日记文件措施

日记文件大概会油不过生的写入,此时说不定会唤起“文件被其余多少个经过占用”,由此能够屡屡品尝写入。上面包车型客车方法会递归的开始展览文件写入尝试,若是尝试次数用完才会最后报错。

  /// <summary>
        /// 保存日志文件
        /// </summary>
        /// <param name="logFileName">不带扩展名文件名</param>
        /// <param name="logText">日志内容</param>
        /// <param name="tryCount">如果出错的尝试次数,建议不大于100,如果是0则不尝试</param>
        public static void SaveLog(string logFileName, string logText, int tryCount)
        {
            string vfileName = string.Format("..\\logs\\{0}_{1}_{2}.log", logFileName, System.Environment.MachineName, DateTime.Now.ToString("yyyyMMdd"));
            string rootPath = System.AppDomain.CurrentDomain.BaseDirectory;
            string targetPath = System.IO.Path.Combine(rootPath, vfileName);
            string fileName = System.IO.Path.GetFullPath(targetPath);
            string fileDir = System.IO.Path.GetDirectoryName(fileName);
            if (!System.IO.Directory.Exists(fileDir))
                System.IO.Directory.CreateDirectory(fileDir);

            try
            {
                System.IO.File.AppendAllText(fileName, logText);
                tryCount = 0;
            }
            catch (Exception ex)
            {
                if (tryCount > 0)
                {
                    System.Threading.Thread.Sleep(1000);
                    logText = logText + "\r\nSaveLog,try again times =" + tryCount + " ,Error:" + ex.Message;
                    tryCount--;
                    SaveLog(logFileName, logText, tryCount);
                }
                else
                {
                    throw new Exception("Save log file Error,try count more times!");
                }
            }
        }

 二陆,ASP.NET获取客户端的IP地址

      string GetRemoteIP()
        {
            string result = HttpContext.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
            if (null == result || result == String.Empty)
            {
                result = HttpContext.Request.ServerVariables["REMOTE_ADDR"];
            }


            if (null == result || result == String.Empty)
            {
                result = HttpContext.Request.UserHostAddress;
            }
            return result;

二7,ASP.NET MVC 在Action里面获取请求的U汉兰达L

可以分为三种办法,
1)ASP.NET MVC 在调节器的私下认可Action里面获得请求别的Action的门道
比如说在私下认可的 Index Action里面获取路线,如下:

string sso_url= "http://" + Request.Url.Authority + Request.Url.AbsolutePath + "/SSO?id=" + userid;

 二)在其余Action里面得到当前调整器的路线 

string ctrName = RouteData.Values["controller"].ToString();
 string redirectUrl = "http://" + Request.Url.Authority + "/" + ctrName + "/SSO?id=" + userid;

 三)直接获得当前Action请求的路径

string url=Request.Url.ToString();

 

28,ASP.NET MVC Action重返能够在浏览器直接查看的纯文本新闻

内需钦定Context的contentType 为“text/plain”,代码如下:

 public ActionResult SendMessage()
 {
   string txt="你好!";
   return Content(text, "text/plain", System.Text.Encoding.UTF8);
  }

 29,使用Linq2XML读写XML

此地根本金和利息用XDocument,XElement对象来操作XML内容,如下代码:

    public static class XDocumentExtentsion
    {
        //生成XML的申明部分
        public static string ToStringWithDeclaration(this XDocument doc, SaveOptions options = SaveOptions.DisableFormatting)
        {
            return doc.Declaration.ToString() + doc.ToString(options);
        }
    }

        public string CreateMsgResult(string loginUserId,string corpid, string msg,string ts)
        {
            var xDoc = new XDocument(
                new XDeclaration("1.0", "UTF-8", null),  
                new XElement("result",
                    new XElement("corpid", corpid),
                    new XElement("userid", loginUserId),
                    new XElement("ts", ts),
                    new XElement("sendmsg", msg)
                ));
            return xDoc.ToStringWithDeclaration();
        }

        public ResponseMessage ParseXMLString(string xml)
        {
            var xDoc = XDocument.Parse(xml);
            if (xDoc == null) return null;
            var root = xDoc.Element("result");
            if(root==null)
                throw new Exception ("not found the 'result' root node,input XML\r\n"+xml);
            ResponseMessage result =
             new ResponseMessage()
             {
                 ErrorCode  = root.Element("rescode").Value,
                 ErrorMessage  = root.Element("resmsg").Value,
                 RedirectUrl  = root.Element("redirect_url") == null ? "" : root.Element("redirect_url").Value
             };

            return result;
        }

 30,访问Web内容的自定义代码

选择 HttpWebRequest和HttpWebResponse 对象完结Web访问,假设是.NET
四.5,提议直接运用 HttpClient对象:

        /// <summary>
        /// 获取请求结果
        /// </summary>
        /// <param name="requestUrl">请求地址</param>
        /// <param name="timeout">超时时间(秒)</param>
        /// <param name="requestXML">请求xml内容</param>
        /// <param name="isPost">是否post提交</param>
        /// <param name="encoding">编码格式 例如:utf-8</param>
        /// <param name="errorMsg">抛出的错误信息</param>
        /// <returns>返回请求结果</returns>
        public static string HttpWebRequest(string requestUrl, int timeout, string requestXML, bool isPost, string encoding, out string errorMsg, string contentType = "application/x-www-form-urlencoded")
        {
            errorMsg = string.Empty;
            string result = string.Empty;
            try
            {
                byte[] bytes = System.Text.Encoding.GetEncoding(encoding).GetBytes(requestXML);
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestUrl);
                request.Referer = requestUrl;
                request.Method = isPost ? "POST" : "GET";
                request.Timeout = timeout * 1000;
                if (isPost)
                {
                    request.ContentType = contentType;// "application/x-www-form-urlencoded";
                    request.ContentLength = bytes.Length;
                    using (Stream requestStream = request.GetRequestStream())
                    {
                        requestStream.Write(bytes, 0, bytes.Length);
                        requestStream.Close();
                    }
                }

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                Stream responseStream = response.GetResponseStream();
                if (responseStream != null)
                {
                    StreamReader reader = new StreamReader(responseStream, System.Text.Encoding.GetEncoding(encoding));
                    result = reader.ReadToEnd();
                    reader.Close();
                    responseStream.Close();
                    request.Abort();
                    response.Close();
                    return result.Trim();
                }
            }
            catch (Exception ex)
            {
                errorMsg =string.Format("Error Message:{0},Request Url:{1},StackTrace:{2}", ex.Message ,requestUrl , ex.StackTrace);
            }

            return result;
        }

 3壹,自定义浏览器协议(伪协议),完毕web程序调用本地程序

(转自 http://blog.sina.com.cn/s/blog_4a77f0630100hav3.html
眼下项目碰到这么个难题。客户需要用web页面,点击一个链接,调用本地的三个主次。

XML,参考了须臾间qq的主意。
tencent://Message/?Uin=000000&websiteName=qzone.qq.com&Menu=yes

在注册表里面增多下边,就能落成,详细内容见原版的书文

 

3贰,线程安全的向集合添英镑素

有时,向1个List对象调用Add
方法,会现出“索引超越了数组界限”那样的标题,此时可以设想动用线程安全的联谊,但对此事情上设定了聚众的最大值的事态下,用线程安全集合就有点重了,效能不高,此时得以经过
Interlocked.CompareExchange 来促成,具体代码如下:

private int length=0;
private int maxLength=50;
private int[] Arr=new int[maxLength];

//使用循环数组,安全的添加元素
void Add(int value){
  int p= Interlocked.CompareExchange(ref length,0,maxLength);
  if(p==length) 
  {
      //说明length变量并且没有达到最大值,并安全的返回length当时的值
      Arr[p]=value;
  }
  else
  {
      //数组元素已经达到上限,需要触发另外的操作,比如将数组全部输出
      // To Do
      //之后,再将当前位置的元素写入
      //此时,length可能是0,也可能是其它值
      Arr[length]=value;
  }
  Interlocked.Increment(ref length);
}

 

 33,WPF绑定异步更新的数额集合

近年做三个WPF项目,后端API推送过来的数目要更新WPF分界面的数码,发现存个别数据尚未跟后端数据状态同样。经常状态下,WPF绑定的Model数据集合都以持续于ObservableCollection
的,然而在当前意况下会有题目,这是足以打包三个异步的数码集合:

public class AsyncObservableCollection<T> : ObservableCollection<T>
{
    //获取当前线程的SynchronizationContext对象
    private SynchronizationContext _synchronizationContext = SynchronizationContext.Current;
    public AsyncObservableCollection() { }
    public AsyncObservableCollection(IEnumerable<T> list) : base(list) { }
    protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
    {

        if (SynchronizationContext.Current == _synchronizationContext)
        {
            //如果操作发生在同一个线程中,不需要进行跨线程执行         
            RaiseCollectionChanged(e);
        }
        else
        {
            //如果不是发生在同一个线程中
            //准确说来,这里是在一个非UI线程中,需要进行UI的更新所进行的操作         
            _synchronizationContext.Post(RaiseCollectionChanged, e);
        }
    }
    private void RaiseCollectionChanged(object param)
    {
        // 执行         
        base.OnCollectionChanged((NotifyCollectionChangedEventArgs)param);
    }
    protected override void OnPropertyChanged(PropertyChangedEventArgs e)
    {
        if (SynchronizationContext.Current == _synchronizationContext)
        {
            // Execute the PropertyChanged event on the current thread             
            RaisePropertyChanged(e);
        }
        else
        {
            // Post the PropertyChanged event on the creator thread             
            _synchronizationContext.Post(RaisePropertyChanged, e);
        }
    }
    private void RaisePropertyChanged(object param)
    {
        // We are in the creator thread, call the base implementation directly         
        base.OnPropertyChanged((PropertyChangedEventArgs)param);
    }
}

越来越多音信,请参考:

WPF多线程UI更新——二种办法

绑定到异步的ObservableCollection

 

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