WCF和EF - 如何强制主机使用自己的连接字符串

Question

请原谅这个极端新手的问题.我无法在其他任何地方找到答案.

我正在使用Entity Framework和WCF编写解决方案.我将写几个不同的客户.我已将数据库连接字符串放在Entity Framework项目的app.config和WCF主机的app.config文件中.

在宿主类中,我用一种方法编写了一个简单的测试服务契约,该方法只是从数据库(来自EF)检索所有客户,称为GetAllCustomers().然后我编写了一个简单的控制台客户端应用程序来调用主机的GetAllCustomers()并将所有客户的名字和姓氏写入控制台.

当我尝试运行客户端时,我收到一条错误消息,"在应用程序配置文件中找不到名为'TRS11Entities'的连接字符串.

如果我将连接字符串复制到客户端控制台应用程序的app.config文件,它可以正常工作,但如果我将其注释掉,它将无法再次运行.

由于WCF主机正在与数据库进行通信,而不是直接与客户端通信,因此我不明白为什么客户端需要连接字符串.我只能猜测连接字符串是从客户端传递到WCF主机到实体框架的链.如何让WCF主机告诉.NET,"降压停在这里!使用我的app.config的连接字符串并停止打扰客户端获取此信息!"

如果重要的话,我正在使用Visual Studio Pro 2012,所有项目都是用C#编写的,目标是V4.5 .NET框架.

来自WCF服务项目中的APP.CONFIG:

  <system.serviceModel>
    <services>
      <service name="OrsonServiceLibrary.Service1">
        <endpoint address="localhost" binding="basicHttpBinding" name="TRS11Entities"
          contract="OrsonServiceLibrary.IService1">
          <identity>
            <dns value="localhost" />
          </identity>
        </endpoint>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8733/Design_Time_Addresses/OrsonServiceLibrary/Service1/" />
          </baseAddresses>
        </host>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, 
          set the values below to false before deployment -->
          <serviceMetadata httpGetEnabled="True" httpsGetEnabled="True"/>
          <!-- To receive exception details in faults for debugging purposes, 
          set the value below to true.  Set to false before deployment 
          to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="False" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
  <connectionStrings>
    <add name="TRS11Entities" connectionString="metadata=res://*/TRS11Model.csdl|res://*/TRS11Model.ssdl|res://*/TRS11Model.msl;provider=FirebirdSql.Data.FirebirdClient;provider connection string='character set=NONE;data source=localhost;initial catalog=&quot;C:\Program Files (x86)\TRS11\Data\DATA1100.FDB&quot;;user id=sysdba;password=masterkey'" providerName="System.Data.EntityClient" />
  </connectionStrings>

来自Entity Framework项目中的APP.CONFIG:

  <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=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <connectionStrings>
    <add name="TRS11Entities" connectionString="metadata=res://*/TRS11Model.csdl|res://*/TRS11Model.ssdl|res://*/TRS11Model.msl;provider=FirebirdSql.Data.FirebirdClient;provider connection string='initial catalog=&quot;C:\Program Files (x86)\TRS11\Data\DATA1100.FDB&quot;;user id=sysdba;password=masterkey;data source=localhost'" providerName="System.Data.EntityClient" />
  </connectionStrings>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="v11.0" />
      </parameters>
    </defaultConnectionFactory>
  </entityFramework>

来自控制台客户端应用程序中的APP.CONFIG:

  <system.serviceModel>
    <client>
      <endpoint address="http://localhost:8000/Service1" contract="OrsonServiceLibrary.IService1" binding="basicHttpBinding" />
    </client>
  </system.serviceModel>

  <!--<connectionStrings>
    <add name="TRS11Entities" connectionString="metadata=res://*/TRS11Model.csdl|res://*/TRS11Model.ssdl|res://*/TRS11Model.msl;provider=FirebirdSql.Data.FirebirdClient;provider connection string='character set=NONE;data source=localhost;initial catalog=&quot;C:\Program Files (x86)\TRS11\Data\DATA1100.FDB&quot;;user id=sysdba;password=masterkey'" providerName="System.Data.EntityClient" />
  </connectionStrings>-->

WCF服务项目中的GetAllCustomers()函数代码:

public HashSet<CUSTOMER> GetAllCustomers()
{
    var db = new TRS11Entities();

    HashSet<CUSTOMER> TheCusts = new HashSet<CUSTOMER>();

    foreach (CUSTOMER c in db.CUSTOMERs)
    {
        TheCusts.Add(c);
    }

    return TheCusts;
}

Console客户端应用代码:

static void Main(string[] args)
{
    Console.WriteLine("Press Enter to begin.");
    Console.ReadLine();

    Service1 MyService = new Service1();

    HashSet<CUSTOMER> cl = MyService.GetAllCustomers();

    foreach (CUSTOMER c in cl)
    {
        Console.WriteLine(c.CUSTFNAME + " " + c.CUSTLNAME);
    }

    Console.WriteLine("Press Enter to exit.");
    Console.ReadLine();
}

主机应用代码:

class Program
{
    static void Main(string[] args)
    {
        ServiceHost hostA = null;

        try
        {
            hostA = new ServiceHost(typeof(Service1));
            hostA.Open();

            Console.WriteLine();
            Console.WriteLine("Host started.  Press Enter to terminate host.");
            Console.ReadLine();

        }
        finally
        {
            if (hostA.State == CommunicationState.Faulted)
                hostA.Abort();
            else
                hostA.Close();
        }
    }
}

谢谢,乔

Answer 1

有些事情告诉我，您实际上是在客户端应用程序中创建服务实例，而不是使用代理/通道。

客户端应用程序代码中的 Service1 类型是什么？是 OrsonServiceLibrary.Service1 吗？

Service1 MyService = new Service1();

如果是这样，只需删除对服务项目的引用并添加服务引用即可。这将生成一个代理，您可以使用它来访问您的服务。