“Data.Repository.UnitofWork”不实现接口成员“Data.Repository.IUnitofW

我有一个接口将另一个接口声明为属性

namespace Data.Repository
{
    interface IUnitofWork : IDisposable
    {
        ICustomer Customer { get; }
        int Complete();
    }
}

我尝试在工作单元类中实现此接口

namespace Data.Repository
{
    public class UnitofWork : IUnitofWork
    {
        private readonly NORTHWNDEntities _context;
        public UnitofWork(NORTHWNDEntities context)
        {
            _context = context;
            customer = new  CustomerRepository(_context);
        }
        public ICustomer customer { get; private set; }

        public int Complete()
        {
            return _context.SaveChanges();
        }
        public void Dispose()
        {
            _context.Dispose();
        }
    }
}

但它在编译时显示错误错误："Data.Repository.UnitofWork"未实现接口成员"Data.Repository.IUnitofWork.Customer"

请帮我解决此错误谢谢

public ICustomer customer { get; private set; }

public ICustomer Customer { get; private set; }