在LINQ to SQL中搜索两列？

Question

我想在Visual Studio中使用LINQ to SQL进行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”。我怎样才能做一个简单的LINQ查询来搜索这两个字段？

在普通的SQL我会做这样的事情：

Answer 1

通常要做的事情是这样的：

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

然而，这并不等同于您的SQL查询。以下是等价的：

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

Answer 2

// 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; 

Answer 3

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