使用linq读取分隔符文本文件
编程学习 2021-07-04 22:40www.dzhlxh.cn编程入门
有时我们会处理一些带分隔符数据文本文件。例如，使用”,”分隔的数据,狼蚁网站SEO优化介绍下使用linq读取分隔符文本文件的方法
如下图：
然后它们存储到文本文件有这样的列：
代码如下:
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：
代码如下:
/// <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：
代码如下:
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:
代码如下:
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：
代码如下:
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;