使用linq讀取分隔符文本文件

如下圖：

然后它們存儲到文本文件有這樣的列：
代碼如下:
First Name
Last Name
Job Title
City
Country

在我們讀取這個文件之前，先建一個實體類：

代碼如下:
/// <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; }
}

接著我們使用LINQ讀取整個文件：
代碼如下:
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);
}

要讀取可以帶條件的記錄也可以,我們filter出Country是UK:
代碼如下:
 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：

代碼如下:
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;

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