是否由于保护级别而无法访问属性？

Question

这是显示错误的行：

public IOAuth2ServiceProvider<IElance> ElanceServiceProvider { get; set; }

它在该行的IElance类型上显示了错误，但这里是接口：

public interface IElance : IApiBinding
    {
        /// <summary>
        /// Search all jobs, list jobs associated with an employee or a freelancer, and retrieve information for a specific job.
        /// </summary>
        IJobOperations JobOperations { get; }

        /// <summary>
        /// Access all messages, users, messages, and Work View™ data associated with an Elance Workroom.
        /// </summary>
        IWorkRoomOperations WorkroomOperations { get; }

        /// <summary>
        /// View all of the information associated with an employee or a freelancer.
        /// </summary>
        IProfileOperations ProfileOperations { get; }

        /// <summary>
        /// View detailed information on freelancers, and retrieve a list of all freelancers employed by an employer.
        /// </summary>
        IFreelancerOperations FreelancerOperations { get; }

        /// <summary>
        /// List Elance groups, and retrieve lists of members and jobs belonging to a group.
        /// </summary>
        IGroupOperations GroupOperations { get; }

        /// <summary>
        /// Obtain ancillary Elance information, such as the current list of all job categories.
        /// </summary>
        IUtilityOperations UtilityOperations { get; }
    }

我无论如何也弄不明白为什么它会告诉我这些。我是不是漏掉了什么明显的东西？我非常感谢关于这个错误的任何指导。

Answer 1

这可能是由于IApiBinding或它的某个基接口不是public造成的。另一种可能是接口成员使用的类型之一不是公共的。