Question

使用数据时出现问题。数据库中已更改的数据未正确显示，因为它已缓存。我认为这是WCF services配置中的问题，但在分析配置文件后，我意识到服务缓存已关闭，但MARS EF功能已启用。

MARS会话缓存

在启用MARS的情况下打开连接时，会出现逻辑会话   创建，这增加了额外的开销。 最小化开销和   增强性能，SqlClient缓存一个MARS会话   连接。

第一个也是最简单的选项是在连接设置中禁用此功能，但此过程需要很长时间，因为在我的项目中没有使用一个服务。因此，问题出现了，这个问题怎么解决？我可以强行更新数据吗？或者以某种方式从前端重置缓存？

技术堆栈： AngularJS + ASP.NET Web API（WCF）。

服务配置文件：

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089, Default Command Timeout=300" requirePermission="false" />
  </configSections>
  <appSettings>
    <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" />
  </system.web>

  <system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding closeTimeout="00:05:00" openTimeout="00:05:00" sendTimeout="00:05:00" maxBufferPoolSize="2147483647" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647">
          <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
        </binding>
      </basicHttpBinding>
    </bindings>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="true" />
          <dataContractSerializer maxItemsInObjectGraph="2147483647" /> 
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <protocolMapping>
      <add binding="basicHttpsBinding" scheme="https" />
    </protocolMapping>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
  </system.serviceModel>

  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true" />
    <directoryBrowse enabled="true" />
  </system.webServer>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
  <connectionStrings>
    <add name="MP" connectionString="data source=*;initial catalog=*;user id=*;password=*;application name=*;MultipleActiveResultSets=True;Connect Timeout=300" providerName="System.Data.SqlClient" />
  </connectionStrings>
</configuration>

WebApi配置文件：

<?xml version="1.0" encoding="utf-8"?>
<configuration>

  <system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" />
    <machineKey decryptionKey="*" validation="*" validationKey="*" />
  </system.web>

  <system.webServer>

  <handlers>
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <remove name="OPTIONSVerbHandler" />
      <remove name="TRACEVerbHandler" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>

  </system.webServer>

  <system.serviceModel>

    <bindings>
      <basicHttpBinding>
        <binding name="BasicHttpBinding_*" sendTimeout="00:05:00" maxBufferSize="200000000" maxReceivedMessageSize="200000000"/>
        <binding name="BasicHttpBinding_*" sendTimeout="00:05:00" maxBufferSize="200000000" maxReceivedMessageSize="200000000" />
        <binding name="BasicHttpBinding_*" sendTimeout="00:05:00" maxBufferSize="2000000000" maxReceivedMessageSize="2000000000" />
      </basicHttpBinding>
    </bindings>
    <client>
      <endpoint address="http://*" binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_*" contract="*" name="*" />
      <endpoint address="http://*" binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_*" contract="*" name="*" />
      <endpoint address="http://*" binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_*" contract="*" name="*" />
      </client>

  </system.serviceModel>
</configuration>

我找到了类似的question，但我想尝试以不同的方式解决问题。我会很高兴任何想法和建议。

代码中的缓存示例：

Cache.cs：

public class CardRegistrationPartyCache
{
    #region Private Members

    private IUserSessionService _userSessionService = null;

    #endregion

    #region Constructors

    public CardRegistrationPartyCache(IUserSessionService userSessionService)
    {
        _userSessionService = userSessionService;
    }

    #endregion

    #region Public

    public void AddOrUpdate(CardRegistrationParty crp)
    {
        string key = this.GetType().FullName + crp.BarcodeID.ToString();
        _userSessionService.SetUserData(key, crp);
    }

    public CardRegistrationParty Get(int barcodeID)
    {
        string key = this.GetType().FullName + barcodeID.ToString();
        return _userSessionService.UserData<CardRegistrationParty>(key);
    }

    #endregion
}

实现：

public class CardRegistrationPartyService : ApplicationService
{
    #region Constructors

    public CardRegistrationPartyService(IInfrastructureFactory infrastructureFactory)
        : base(infrastructureFactory)
    {

    }

    #endregion

    public IEnumerable<CardRegistrationParty> GetCardRegistrationPartyListWithChecks(IList<KeyValuePair<int, GPF>> list)
    {
        int listCount = list == null ? 0 : list.Count();
        Infrastructure.Logger.Info(String.Format("Get informations (" + listCount.ToString()) + ")");

        // Caching
        CardRegistrationPartyCache cache = new CardRegistrationPartyCache(Infrastructure.CreateUserSessionService());

        IList<CardRegistrationParty> CardRegistrationPartyes = new List<CardRegistrationParty>();

        // Check cache
        foreach(KeyValuePair<int, GPF> item in list)
        {
            CardRegistrationParty party = cache.Get(item.Key);
            if (party != null)
            {
                CardRegistrationPartyes.Add(party);
            }                
        }
        // Delete the keys for which information was found
        if (CardRegistrationPartyes != null)
        {
            foreach (CardRegistrationParty p in CardRegistrationPartyes)
            {
                KeyValuePair<int, GPF> key = new KeyValuePair<int, GPF>(p.BarcodeID, p.Gpf);
                list.Remove(key);
            }                
        }

        // If there are keys on which there was no information - we load
        if ((list != null) &&(list.Count() > 0))
        {
            IEnumerable<CardRegistrationPartyDTO> CardRegistrationPartyesDTO = Infrastructure.CreateTestsOfEriService().GetCardRegistrationPartyListWithChecks(list.Select(m => m.Key).ToArray());

            Infrastructure.Logger.Trace(String.Format("Start DTOs -> DomainObjects"));

            foreach (CardRegistrationPartyDTO CardRegistrationPartyDTO in CardRegistrationPartyesDTO)
            {
                CardRegistrationPartyBuilder cardRegistrationPartyBuilder = new CardRegistrationPartyBuilder(CardRegistrationPartyDTO, list);
                CardRegistrationParty CardRegistrationParty = cardRegistrationPartyBuilder.Build();
                CardRegistrationPartyes.Add(CardRegistrationParty);

                cache.AddOrUpdate(CardRegistrationParty);
            }

            Infrastructure.Logger.Trace(String.Format("End DTOs -> DomainObjects"));
        }

        return CardRegistrationPartyes;
    }
}

在启用MARS的情况下强制缓存重置，并在asp.net web api中缓存

0 个答案: