Question

我正在使用C＃中的LINQ TO SQL连接到SQL数据库

我在DataBase上有一个名为Person的表格，其中包含有关人员的信息，并包含以下字段Person_Id，First_Name，Last_Name，Email， Password

我有以下查询，如果匹配，则返回一行：

LINQDataContext data = new LINQDataContext();
            var query = from a in data.Persons
                        where a.Email == "Any Email String"
                        select a;

我的问题是如何将query转换为定义为的等效类的实例：

class Person
{
    public int person_id;
    public string First_Name;
    public string Last_Name;
    public string E_mail;
    public string Password;
    public Person() { }
}

Answer 1

像这样：

Person query = (from a in data.Persons
            where a.Email == "Any Email String"
            select new Person { person_Id = a.Id, and so on }).FirstOrDefault();

Answer 2

我会这样做：

var query = (from a in data.Persons
            where a.Email == "Unique Email String"
            select new Person { person_Id = a.Id, etc etc });

//By using this code, you can add more conditions on query as well..

//Now the database hit will be made
var person = query.FirstOrDefault();

使用LINQ TO SQL将查询转换为对象

2 个答案: