Question

这是生成列表的linq

var query = (from vinfo in vQuery 
            join Add in _db.Addresses on vinfo.Id equals Add.vId
            select new AddressLabels
            {
              Id = vinfo.Id,
              Name = vinfo.Name,
              Address1 = Add.Address1,
              Address2 = Add.Address2,
              ZipCode = Add.ZipCode,
              City = Add.City,
              Country = Add.Country,
              Contact1 = Add.Contact1,
              Contact2 = Add.Contact2
            });

在上面的列表中，contact1和contact2都有可能相同。当Contact1不等于contact2时，我必须为上面列表中的每个联系人生成2个单独的列表。列表将具有与父列表相同的数据，但一个列表将具有contact1，另一个列表将具有contact2 这就是我所看到的。

List1：

Id
Name
Address1
Address2
ZipCode
City
Country
Contact1

列表2：

Id
Name
Address1
Address2
ZipCode
City
Country
Contact2

请帮助

Answer 1

// Check if your list has items with same contacts
if (!query.Any(a => a.Contact1.Equals(a.Contact2)))
{
    return query;
}

// Else, create two new lists
var itemsWithSameContacts = query.Where(a => a.Contact1.Equals(a.Contact2));

var firstList = itemsWithSameContacts.Select(a => new AddressLabels
{
    Id = a.Id,
    Name = a.Name,
    Address1 = a.Address1,
    Address2 = a.Address2,
    ZipCode = a.ZipCode,
    City = a.City,
    Country = a.Country,
    Contact1 = a.Contact1,
}).ToList();

var secondList = itemsWithSameContacts.Select(a => new AddressLabels
{
    Id = a.Id,
    Name = a.Name,
    Address1 = a.Address1,
    Address2 = a.Address2,
    ZipCode = a.ZipCode,
    City = a.City,
    Country = a.Country,
    Contact2 = a.Contact2,
}).ToList();

// If you want these lists also to have contacts 
// which don't have same contacts, then you can also
var itemsWithNotSameContacts = query.Where(a => !a.Contact1.Equals(a.Contact2));
firstList.AddRange(itemsWithNotSameContacts);
secondList.AddRange(itemsWithNotSameContacts);

如何使用linq基于父列表中的字段将列表拆分为2个单独的列表

1 个答案: