使用linq读取分隔符文本文件

如下图：

然后它们存储到文本文件有这样的列：

first name
last name
job title
city
country

在我们读取这个文件之前，先建一个实体类：

/// <summary>
 /// customer entity
/// </summary>
public class customer{
public string firstname { get; set; }
public string lastname { get; set; }
public string jobtitle { get; set; }
public string city { get; set; }
public string country { get; set; }
}

接着我们使用linq读取整个文件：

var query = from line in file.readalllines(filepath)
 let customerrecord = line.split(',')
select new customer()
 {
firstname = customerrecord[0],
lastname = customerrecord[1],
 jobtitle = customerrecord[2],
city = customerrecord[3],
country = customerrecord[4]
};
 foreach (var item in query)
{
console.writeline("{0}, {1}, {2}, {3}, {4}"
 , item.firstname, item.lastname, item.jobtitle, item.city, item.country);
}

要读取可以带条件的记录也可以,我们filter出country是uk:

 var query = from c in
(from line in file.readalllines(filepath)
 let customerrecord = line.split(',')
select new customer()
{
firstname = customerrecord[0],
lastname = customerrecord[1],
 jobtitle = customerrecord[2],
city = customerrecord[3],
country = customerrecord[4]
})
 where c.country == "uk"
select c;

另一例子：

var query = from c in
(from line in file.readalllines(filepath)
let customerrecord = line.split(',')
select new customer()
{
firstname = customerrecord[0],
lastname = customerrecord[1],
jobtitle = customerrecord[2],
city = customerrecord[3],
country = customerrecord[4]
})
where c.jobtitle.contains("sales")
select c;