在LINQ to SQL中搜索两列？

如何解决在LINQ to SQL中搜索两列？

| 我试图在Visual Studio中使用LINQ to sql做一个简单的搜索方法。在我的数据库中，我有“ \ Firstname \”和\“ Lastname \”字段，而我的搜索字符串是“ \ name \”。我怎样做一个简单的查询两个字段的LINQ查询？ 在普通的sql中，我将执行以下操作：

SELECT (Firstname + Lastname) as \'Fullname\'
FROM   table
WHERE  Fullname LIKE \'%searchstring%\'

    

解决方法

通常要做的是：

var users =
    from user in db.Users
    where user.FirstName.Contains(searchString) ||
        user.LastName.Contains(searchString)
    select user;

但是，这不等同于您的SQL查询。以下是等效的：

var users =
    from user in db.Users
    let fullName = user.FirstName + user.LastName
    where fullName.Contains(searchString)
    select user;

    ,

var result = from p in db.Table
             let fullname = p.FirstName + \" \" + p.Lastname
             where fullname.Contains(searchString)
             select new { Fullname = fullname };

    ,

// get all items from table where firstname like searchstring or lastname like searchstring
var result = from p in db.Table
             where (p.Firstname.Contains(searchString) || p.Lastname.Contains(searchString))
             select p;