c# - 无法将类型 IEnumerable 转换为 List C#

Question

我正在尝试将列表带到 frontEnd .我正在使用 mongoDb。我的 mongodb有一个名为 Employee 的集合. Employee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 ，我有一个属性叫做: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 depedentID 的好处等于参数。当我使用这种方法时，它有一个无法转换的错误。 IEnumerable to List 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();
}

获取这些数据的最佳方式是什么？这个过滤器？我用这个问题作为引用: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 List<T> ，您可以将模型更改为 IEnumerable<T>或者你可以改变这行代码:

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

到这里:

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