Question

我有一个linq查询，可以从客户和客户联系人那里获取所有数据。但有时我不想要所有联系人，所以我想指定一个条件，如果此值等于获取联系人然后运行查询。同样也是..

switch (options)
{
    case CustomerOptions.DefaultContacts:
    break;
}

我目前有这个linq查询

var customersToReturn = new ContentList<CustomerServiceModel>()
{
    Total = customers.Total,
    List = customers.List.Select(c => new CustomerServiceModel
    {
        Id = c.Id,
        ContractorId = c.ContractorId,
        CompanyName = c.CompanyName,
        Active = c.Active,
        Address = new Address
        {
            Address1 = c.Address1,
            Address2 = c.Address2,
            Address3 = c.Address3,
            Address4 = c.Address4,
        },
        CustomerContacts = c.CustomersContacts.Select(a => new ContactServiceModel
        {
            Name = a.Name,
            Telephone = a.Telephone      
        }).Where(e => e.IsDefault)
    }).ToList()
};

有没有办法可以设定条件，还是我需要为客户重复两次，为客户和客户联系重复一次？

Answer 1

如果我理解正确，您希望某些CustomServiceModel个对象拥有CustomerContacts，而其他对象却没有？{1}}然后我会这样做

List = customers.List.Select(c => new CustomerServiceModel
                        {
                            Id = c.Id,
                            ContractorId = c.ContractorId,
                            CompanyName = c.CompanyName,
                            Active = c.Active,
                            Address = new Address
                            {
                                Address1 = c.Address1,
                                Address2 = c.Address2,
                                Address3 = c.Address3,
                                Address4 = c.Address4,
                            },
                            CustomerContacts = condition ?
                                c.CustomersContacts.Select(a => new ContactServiceModel
                                {
                                    Name = a.Name,
                                    Telephone = a.Telephone      
                                }).Where(e => e.IsDefault)
                                :null
                        }).ToList()

如果您需要使用switch，请创建一个返回bool的方法，并在上面的示例中将其替换为condition短语。

linq查询中的条件

1 个答案: