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我想在使用AdventureWorks2012数据库和EF的演示应用程序中保持一致,但我需要一些帮助将此Linq语句转换为扩展方法。将查询语法转换为扩展方法语法
return (from person in this.context.Persons
from email in this.context.EmailAddresses
where email.EmailAddress == emailAddress
select person).FirstOrDefault();
的对象包括:
public class Person
{
public int BusinessEntityId { get; set; }
public string PersonType {get;set;}
public bool NameStyle { get; set; }
public string Title { get; set; }
public string FirstName { get; set; }
public string MiddleName { get; set; }
public string LastName { get; set; }
public string Suffix { get; set; }
public int EmailPromotion { get; set; }
public PersonPassword Password { get; set; }
public virtual ICollection<PersonEmailAddress> EmailAddresses { get; set; }
}
public class PersonEmailAddress
{
public int BusinessEntityId { get; set; }
public int EmailAddressId { get; set; }
public string EmailAddress { get; set; }
public virtual Person Person { get; set; }
}
public class PersonPassword
{
public int BusinessEntityId { get; set; }
public string PasswordHash { get; set; }
public string PasswordSalt { get; set; }
public virtual Person Person { get; set; }
}
凡BusinessEntityId是PK。 任何帮助,不胜感激。谢谢...
*阅读起来不太好,而且很难理解。*我相反。 – 2013-02-22 01:49:44