在CodeProject网站上发现了以下这段话,读不懂,
烦请知道的朋友指点一下咯:
private void Form1_Load(object sender, EventArgs e)
{
IQueryable<PPN> ppnQuery=ppnContext.Person.Join(
ppnContext.PersonName,
person => person.PersonName,
personName => personName,
(person, personName) => new PPN()
{
Gender=person.Gender,
LastName=personName.LastName,
FirstName = personName.FirstName,
PersonObject=person,
PersonNameObject=personName
}).AsQueryable(); bsppn.DataSource = ppnQuery;
dgvPersonPersonName.DataSource = bsppn;
dgvPersonPersonName.Columns["PersonObject"].Visible = false;
dgvPersonPersonName.Columns["PersonNameObject"].Visible = false;
}
尤其是:
IQueryable<PPN> ppnQuery=ppnContext.Person.Join(
ppnContext.PersonName,
person => person.PersonName,
personName => personName,
(person, personName) => new PPN()
{
Gender=person.Gender,
LastName=personName.LastName,
FirstName = personName.FirstName,
PersonObject=person,
PersonNameObject=personName
}).AsQueryable();还有下面的?
person => person.PersonName,
personName => personName,=>在这儿起什么作用啊?
是LinQ的语法?
烦请知道的朋友指点一下咯:
private void Form1_Load(object sender, EventArgs e)
{
IQueryable<PPN> ppnQuery=ppnContext.Person.Join(
ppnContext.PersonName,
person => person.PersonName,
personName => personName,
(person, personName) => new PPN()
{
Gender=person.Gender,
LastName=personName.LastName,
FirstName = personName.FirstName,
PersonObject=person,
PersonNameObject=personName
}).AsQueryable(); bsppn.DataSource = ppnQuery;
dgvPersonPersonName.DataSource = bsppn;
dgvPersonPersonName.Columns["PersonObject"].Visible = false;
dgvPersonPersonName.Columns["PersonNameObject"].Visible = false;
}
尤其是:
IQueryable<PPN> ppnQuery=ppnContext.Person.Join(
ppnContext.PersonName,
person => person.PersonName,
personName => personName,
(person, personName) => new PPN()
{
Gender=person.Gender,
LastName=personName.LastName,
FirstName = personName.FirstName,
PersonObject=person,
PersonNameObject=personName
}).AsQueryable();还有下面的?
person => person.PersonName,
personName => personName,=>在这儿起什么作用啊?
是LinQ的语法?
lambda表达式
微软官方的说明:
http://msdn.microsoft.com/zh-cn/library/bb397687.aspx