IQueryable 添加 OR 条件到查询链

Question

如何使用 OR 条件链接 EF 查询

现在我正在像下面这样链接或构建查询，这最终添加了 AND 条件

              if (model.EMailChoices?.Count() > 0)
                {
                    query = query.Where(
                                        c => model.EMailChoices.Contains(c.Contact.CommunicationPreferences.TPEMail)
                                        );
                }

                if (model.MailChoices?.Count() > 0)
                {
                    query = query.Where(
                                        c => model.MailChoices.Contains(c.Contact.CommunicationPreferences.TPMail)
                                    );
                }

                if (model.PhoneChoices?.Count() > 0)
                {
                    query = query.Where(
                                        c => model.PhoneChoices.Contains(c.Contact.CommunicationPreferences.TPTelephone)
                                    );
                }

我们如何向这条链添加 OR 条件

Answer 1

bool anyEmails = model.EMailChoices?.Any() == true;
bool anyMails = model.MailChoices?.Any() == true;
bool anyPhones = model.PhoneChoices?.Any() == true;

if(anyEmails || anyMails || anyPhones)
{
     query = query.Where( 
         c => (anyEmails && model.EMailChoices.Contains(c.Contact.CommunicationPreferences.TPEMail))
           || (anyMails && model.MailChoices.Contains(c.Contact.CommunicationPreferences.TPEMail))
           || (anyPhones && model.PhoneChoices.Contains(c.Contact.CommunicationPreferences.TPTelephone)));
}

IQueryable 添加 OR 条件到查询链

IQueryable Adding OR Conditions to the chain of queries

c#

entity-framework

iqueryable