asp.net 中的单件模式的使用

 使用单件模式可以节省系统资料.

可参考
http://terrylee.cnblogs.com/archive/2005/12/09/293509.html

这里给出使用的例子

namespace SZUM.ZHZF.Analysing.Logic.CommonBaseClass { public sealed class ConstValues { private XmlDocument xmlConst; private XmlDocument XmlConst { get { if (xmlConst == null) { xmlConst = new XmlDocument(); string strPath = System.Web.HttpContext.Current.Server.MapPath("~/Settings/ConstValues.config"); if (File.Exists(strPath)) { xmlConst.Load(strPath); } } return xmlConst; } } public ConstValues() { XmlDocument d = XmlConst; } private static ConstValues instance; private static object syncLock = new object(); //加载 public static ConstValues Instance { get { if (instance == null) { lock (syncLock) { if (instance == null) { instance = new ConstValues(); } } } return instance; } } /// <summary> /// 根据Key获取值 /// </summary> /// <param name="strKey"></param> /// <returns></returns> private string GetValue(string strKey) { string strResult = string.Empty; if (XmlConst != null) { string path = string.Format("/configuration/appSettings/add[@key=/"{0}/"]", strKey); XmlNode node = XmlConst.SelectSingleNode(path); if (node != null && node.Attributes.Count > 0) { return node.Attributes["value"].Value; } } return strResult; } private Guid GetGuid(string strKey) { string strResult = GetValue(strKey); if (strResult.Length > 0) { return new Guid(strResult); } else { return Guid.Empty; } } private const string urlformat = "<A href="/" mce_href="/""@:filenameurl?dept={0}&dstart={1}&dend={2}/" Target=/"_blank/" title=/"查看明细/">{3}</A>"; private string _urlNoneMake = string.Empty; public string UrlNoneMake { get { if (string.IsNullOrEmpty(_urlNoneMake)) { _urlNoneMake = urlformat.Replace("@:filenameurl","View/View_CaseNoneMake.aspx"); } return _urlNoneMake; } } } }


调用方法.

ConstValues.Instance.UrlNoneMake  可以取的值

谢谢大家