从另一个表中选择一个bool列

我有一个成功的查询，从连接表返回多条记录，并生成bool Selected值(如果另一个表中存在当前用户的记录)。

public IEnumerable<BrowseVendorModel> SearchVendors(CustomSearchModel criteria)
{
    var query = _db.VendorProfiles
                   .Include("VendorCategories")
                   .Include("VendorsSelected")
                   .Select(s => new BrowseVendorModel
                       {
                           ProfileID = s.ProfileID,
                           Name = s.Name,
                           CompanyName = s.CompanyName,
                           City = s.City,
                           State = s.State,
                           DateCreated = s.DateCreated,
                           // gets bool for selected vendors for current user
                           Selected = s.VendorsSelected.Select(vs => vs.UserName).Contains(HttpContext.Current.User.Identity.Name),
                           VendorsSelected = s.VendorsSelected,
                           VendorCategories = s.VendorCategories
                       })
                   .OrderBy(x => x.DateCreated);
    return query;
}

我正试图编写另一个查询，检索一行，但也需要获得bool选择值，而不像上面那样将结果投射到类中。这是我试图接近的失败尝试。

public VendorProfile GetVendor(String id)
{
    Guid pid = Guid.Parse(id);
    var viewModel = _db.VendorProfiles
        .Include("VendorCategories.ProductServiceCategory")
        .Include("VendorsSelected")
        .Select(s => new {
            VendorProfiles = s,
            Selected = s.VendorsSelected.Select(vs => vs.UserName).Contains(HttpContext.Current.User.Identity.Name)
        })
        .Where(s => s.VendorProfiles.ProfileID == pid);
    return viewModel;
}

我试图生成的bool列如果为空(没有记录匹配)则为false，如果找到记录则为true。如果您需要模型的可视化，请参阅此链接