Question

我正在尝试将列表列入frontEnd。我正在使用mongoDb。我的mongodb有一个名为Employee的集合。 Employee具有以下属性

public class EmployeeViewModel
{
    [BsonId(IdGenerator = typeof(StringObjectIdGenerator))]
    public string ownerId { get; set; }
    public string atributeChange { get;  set; }
    public PersonalDataViewModel personalData { get; set; }
    public AddressViewModel address { get; set; }
    public List<EmailsViewModel>  emails { get; set; }
    public SyndicateViewModel syndicate { get; set; }
    public List<DependentsViewModel> dependents { get; set; }
    public List<PhoneViewModel> phone { get; set; }
    public List<BankViewModel> bank { get; set; }
    public AttributesViewModel attributes { get; set; }
    public List<BenefitsViewModel> benefits { get; set; }
    public TransportViewModel transport { get; set; }
    public List<AttachmentsViewModel> attachments { get; set; }
    public List<DocumentsViewModel> documents { get; set; }
    public List<DocumentsImagesViewModel> DependentsDocuments { get; set; }
    public List<AttachmentsViewModel> DependentsAttachments { get; set; }
    public List<BenefitsViewModel> DependentsBenefits { get; set; }
}

在此Model中，我有一个名为：public List <DocumentsImagesViewModel> DependentsDocuments {get; set; }：

public class DocumentsViewModel
{
    [BsonId]
    public string ownerId { get; set; }
    public string id { get; set; }
    public string dependentId { get; set; }
    public string number { get; set; }
    public DateTime expiration { get; set; }
    public List<DocumentsImagesViewModel> images { get; set; }
    public List<DocumentPropertiesViewModel> properties { get; set; }
    public DocumentTypeViewModel type { get; set; }
}

我正在尝试带来包含等于参数的depedentID的好处。当我使用此方法时，它有一个无法转换的错误。 IEnumerable列出C＃

public async Task<List<Documents>> GetDocument(string ownerId, string dependentId)
{
    var query = from employee in _employee.AsQueryable()
                where employee.ownerId == ownerId
                select new Employee()
                {
                   DependentsDocuments  = employee.DependentsDocuments.Where(x => x.dependentId == dependentId)                            
                };               
    return query.ToList();
}

获取此数据的最佳方法是什么？这个过滤器？我用这个问题作为参考：Mongodb C# driver return only matching sub documents in array

Answer 1

LINQ的.Where返回IEnumerable<T>，您的模型需要一个List<T>，您可以将模型更改为IEnumberale<T>，也可以更改以下代码行：

DependentsDocuments = employee.DependentsDocuments.Where(x =>
x.dependentId == dependentId)

为此：

DependentsDocuments = employee.DependentsDocuments.Where(x =>
x.dependentId == dependentId).ToList()

Answer 2

将您的代码更改为此代码可能可行：

public async Task<List<Documents>> GetDocument(string ownerId, string dependentId)
        {
            var query = (from employee in _employee.AsQueryable()
                        where employee.ownerId == ownerId
                        select new Employee()
                        {
                           DependentsDocuments  = employee.DependentsDocuments.Where(x => x.dependentId == dependentId).ToList()                            
                        }).ToList();               
            return query.ToList();
        }

无法将IEnumerable类型转换为List C＃

2 个答案: