Question

如何取指定字段后组成实体类 linq to entity-CSDN论坛

Answer 1

效率上是有影响的
var ss = textcontext.Buy_booktb.where(b => b.bookid== bookid)
.select(b => new {b.bookid, b.bookname})
.FirstOrDefault();
但这样生成的是匿名类型，不能直接return了，因为返回类型对不上了

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你要写个具体类
public class my
{
public int bookid;
public string bookname;
}

然后返回类型为my

my ss = textcontext.Buy_booktb.where(b => b.bookid == bookid)
.select(b => new my{bookid = b.bookid, bookname = b.bookname})
.FirstOrDefault();
return my;