找不到WCF实体框架6 SQL提供程序

我写一个客户端服务器应用程序如果服务器从EF6请求数据没有问题，也没有异常 . 如果客户端询问来自EF6的WFC数据，则会发现提供程序未找到异常 . 我的数据库是MS SQL Server 2017.CLient和Server具有相同的调试文件夹 .

WFC的例外情况：

“找不到具有不变名称'System.Data.SqlClient'的ADO.NET提供程序的实体框架提供程序 . 确保提供程序已在应用程序配置文件的'entityFramework'部分中注册 . 请参阅http://go.microsoft .com / fwlink /？LinkId = 260882获取更多信息 . “

Server App.config

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

Integrated Security = True; Database = PeddTax; MultipleActiveResultSets = True“/>

<system.web>
    <compilation debug="true" />
</system.web>

<system.serviceModel>
    <services>
        <service name="PeddTaxServer.Communication.UserService">
            <endpoint address="http://localhost:6060/wcf/UserService" binding="basicHttpBinding"
                bindingConfiguration="" name="UserServiceEndpoint" contract="PeddTax.Communication.Interfaces.IUserService" />
        </service>
    </services>
</system.serviceModel>

客户端App.config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
<startup> 
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.1" />
</startup>

<system.serviceModel>
    <client>
    <endpoint address="http://localhost:6060/wcf/UserService" 
      binding="basicHttpBinding" bindingConfiguration="" 
      contract="PeddTax.Communication.Interfaces.IUserService" 
      name="UserServiceEndpoint" kind="" endpointConfiguration="" />
    </client>
</system.serviceModel>

<system.web>
    <compilation debug="true" />
</system.web>
</configuration>

WFC的IUserInterface

[ServiceContract]
public interface IUserService
{
    [OperationContract]
    void AddUser(User user);

    [OperationContract]
    void UpdateUser(User user);

    [OperationContract]
    User GetUser(Guid id);

    [OperationContract]
    List<User> GetUsers();

    [OperationContract]
    void DeleteUser(User user);
}

WFC的UserService

public class UserService : IUserService, IService
{
    UserRepository userRep = new UserRepository();

    public void AddUser(User user)
    {
        userRep.Add(user);
        userRep.Save();
    }

    public void DeleteUser(User user)
    {
        userRep.Delete(user);
        userRep.Save();
    }

    public User GetUser(Guid id)
    {
        return userRep.GetSingle(id);
    }

    public List<User> GetUsers()
    {
        return userRep.GetAll().ToList();
    }

    public void UpdateUser(User user)
    {
        userRep.Edit(user);
        userRep.Save();
    }
}

在userRepository中有这种方法

public IQueryable<T> GetAll()
{
    IQueryable<T> query = entities.Set<T>();
    return query;
}