项目场景:
比如一个仓储系统,可以切换仓房 ,每个仓房对接的设备链接不同 ,需要获取当前仓房的链接
这时候就需要一个公共量来表示这个链接,方便后续在不同的接口里调用,当多个用户操作这个系统时,需要保证这个公共量是当前用户操作的仓房链接
解决方案:
ConcurrentDictionary 这个可以有效保证线程安全
            
            
              cs
              
              
            
          
          using Xhxx.Authorize;
using System.Configuration;
using System.Web.Http;
using Xhxx.Entity;
using ES.Web.Api;
using System.Net.Http;
using System.Web;
using System.Collections.Concurrent;
namespace System.Linq
{
#if DEBUG
    [AllowAnonymous]
#endif
    public class NBBaseController : BaseController
    {
       
        private static readonly ConcurrentDictionary<string, string> WmsUrlDic = new ConcurrentDictionary<string, string>();
//当前仓发链接
        public  string CurrentWmsUrl
        {
            get {
                return WmsUrlDic.GetOrAdd(base.loginerBase.UserCode ?? "super","");
            }
            set {
                WmsUrlDic.AddOrUpdate(base.loginerBase.UserCode ?? "super", value, (k, v) => value);
            }
        }
        public NBBaseController()
        {
           
        }
       
        protected void GetCruentWmsUrl(string StoreHouseCode)
        {
            lock (_locker)
            {
         
                switch (StoreHouseCode)
                {
                    case "913302001440687412007":
                        WmsUrlDic.TryUpdate(base.loginerBase.UserCode ?? "super", ConfigurationManager.AppSettings["WmsUrl"], CurrentWmsUrl);
                        break;
                    case "913302001440687412036":
                        WmsUrlDic.TryUpdate(base.loginerBase.UserCode ?? "super", ConfigurationManager.AppSettings["WmsLkUrl"], CurrentWmsUrl);
                        break;
                    default:
                        WmsUrlDic.TryUpdate(base.loginerBase.UserCode ?? "super", "", CurrentWmsUrl);
                        break;
                }
            }
           
          
        }
    }
  
      
    }
}