如何使用 Entity Framework Core 先插入子数据，然后插入父数据和子插入标识

问题描述

我有一个要求，我需要先在子表中插入数据，然后在其父表中插入数据，然后在父表中插入记录标识，这就是我在更新现有记录时正在做的事情。让我们看看请求正文：

{
    "StudentId": 111001,"StudentName": "Gaurav Singh","Address": 
    [
        {
            "AddressId" : 223344,"AddressType": 1,"StudentId" : 111001,"AddressLine1": "Noida Sec 15","City": "Noida","State": "U.P.","Country": "India","PhoneId":311386
            "PhoneNumber": {
                "PhoneId": 311386,"PhoneNumber": "123456789"
            }
        },{ // this my new entry in database which is not getting inserted.
            "AddressId" : null,"AddressType": 2,"AddressLine1": "Noida Sec 18","PhoneId":0
            "PhoneNumber": {
                "PhoneId": NULL,"PhoneNumber": "2233445566"
            }
        }
    ]
}

现在在我的代码中，我正在尝试使用以下代码，但在更新现有数据时它无法正常工作，但对于全新的记录，它工作正常。

foreach (var _adressData in data.Addresses.ToList())
{
    var _address = _context.Address
                           .Where(p => p.AddressId == _adressData.AddressId)
                           .FirstOrDefault();

    if (_address != null)
    {
        _context.Entry(_address).CurrentValues.SetValues(_adressData);
    }
    else
    {
        var _adr = new Address
        {
            AddressId = null,AddressType = 2,StudentId = 111001,AddressLine1 = "Noida Sec 18",City = "Noida",State = "U.P.",Country = "India",PhoneNumber = new PhoneNumberEntity{
                PhoneId = NULL,PhoneNumber = "2233445566"
            }
        };

        currentData.Address.Add(_adr);
    }
}

await _context.SaveChangesAsync();
return currentData;

大家有什么建议吗？

课程是 -

public class student {
    public int StudentId {get;set;}
    public string StudentName {get;set;}
    public ICollection<AddressEntity> Addresses {get;set;}}

public class AddressEntity {
    public int StudentId {get;set;}
    public int AddressType {get;set;}
    public int PhoneId {get;set;}
    public string AddressLine1 {get;set;}
    public string City {get;set;}
    public string State {get;set;}
    public string Country {get;set;}
    public PhoneEntity PhoneNumber {get;set;} }

public class PhoneEntity {
    public int PhoneId {get;set;}
    public string PhoneNumber {get;set;} }

谢谢

解决方法

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