Linq to sql 如何使用LINQ从函数返回值
下面是我无法计算返回类型的代码示例,此函数属于clsExhibitorlist类。我想将其绑定到我的gridview 公众???GetExhibitorList() {Linq to sql 如何使用LINQ从函数返回值,linq-to-sql,Linq To Sql,下面是我无法计算返回类型的代码示例,此函数属于clsExhibitorlist类。我想将其绑定到我的gridview 公众???GetExhibitorList() { using (DataClasses1DataContext context = new DataClasses1DataContext()) { var Exhibitors = from c in context.Companies
using (DataClasses1DataContext context = new DataClasses1DataContext())
{
var Exhibitors = from c in context.Companies
join b in context.Booths on c.CoID equals b.CoID
join bc in context.BoothCategories
on b.BoothID equals bc.BoothID
join sp in context.SubProductCategories
on bc.SubProdCatID equals sp.SubProdCatID
join p in context.ProductCategories on
sp.ProdCatID equals p.ProdCatID
orderby c.CoID
select new clsExhibitorList { c.CoID, c.CompanyName, b.FPCoName,p.ProdCatID,sp.SubProdCatID};
if (Keyword != "")
{
Exhibitors = Exhibitors.Where(c => c.CompanyName.Contains(Keyword));
}
if (ProdCatID != "")
{
Exhibitors = Exhibitors.Where(c => c.ProdCatID.Equals(ProdCatID.Split(',')));
}
if (SubProdCatID != "")
{
Exhibitors = Exhibitors.Where(c => c.SubProdCatID.Equals(SubProdCatID.Split(',')));
}
return Exhibitors;
}
}
啊,我在代码中没有看到任何实际调用查询的内容。因此,该方法返回一个表示查询的表达式树 如果在return语句中添加类似.ToList()的内容,则将强制计算查询,然后返回类型将为 列表