Dapper 多映射错误

Question

我正在努力让多映射在 dapper 中工作。

这是我的代码：

var contactDictionary = new Dictionary<Guid, Contact>();

IEnumerable<Contact> contacts = connection.Query<Contact, Activity, Contact>(
        @"SELECT ContactId, Title, FirstName, Surname, 
            AddressType.Type AS AddressType, Address.AddressLine1, Address.AddressLine2, Address.AddressLine3, Address.Town, Address.County, Address.Country, Address.Postcode,
            EmailAddressType.Type AS EmailAddressType, EmailAddress.Email AS EmailAddress,
            PhoneNumberType.Type As PhoneNumberType, PhoneNumber.Number AS PhoneNumber,
            Direction.Type AS Direction, Activity.Summary, Activity.DateCompleted
        FROM Contact
            LEFT JOIN Address ON Contact.ContactPK = Address.ContactPK
                LEFT JOIN AddressType ON Address.AddressTypePK = AddressType.AddressTypePK
            LEFT JOIN EmailAddress ON Contact.ContactPK = EmailAddress.ContactPK
                LEFT JOIN EmailAddressType ON EmailAddress.EmailAddressTypePK = EmailAddressType.EmailAddressTypePK
            LEFT JOIN PhoneNumber ON Contact.ContactPK = PhoneNumber.ContactPK
                LEFT JOIN PhoneNumberType ON PhoneNumber.PhoneNumberTypePK = PhoneNumberType.PhoneNumberTypePK
            LEFT JOIN Activity ON Contact.ContactPK = Activity.ContactPK
                LEFT JOIN Direction ON Activity.DirectionPK = Direction.DirectionPK
        WHERE Contact.ContactId = @ContactId
            AND Address.IsPrimary = 1 AND EmailAddress.IsPrimary = 1 AND PhoneNumber.IsPrimary = 1",
        param:new { ContactId = contactId },
        map:(c, a) =>
        {
            Contact contactEntry;

            if (!contactDictionary.TryGetValue(c.ContactId, out contactEntry))
            {
                contactEntry = c;
                contactEntry.Activities = new List<Activity>();
                contactDictionary.Add(contactEntry.ContactId, contactEntry);
            }

            contactEntry.Activities.Add(a);
            return contactEntry;
        },
        splitOn: "ContactId")
        .Distinct()
        .ToList();

这是 SSMS 中运行时 SQL 的结果：

这是我在执行代码时遇到的错误： 使用多映射 API 时，如果您有 Id 以外的键，请确保设置 splitOn 参数参数名称：splitOn

我真的很困惑，因为我以为我指定了 splitOn 参数？

如有任何帮助，我们将不胜感激。

Answer 1

splitOn 参数应指示 dapper 如何将属性与两个实体（联系人和 Activity）分开，您应将其设置为 activity 的第一个属性（假设您属性在 SQL 语句中排序）。

Dapper 多映射错误

Dapper multi-mapping error

c#

linq

asp.net

dapper

asp.net-core