Question

我有一个员工列表，我想构建一个字符串，其中包含逗号分隔所有LastNames。

样本数据：

Emp1.LastName = "A"
Emp2.LastName = "B"
Emp3.LastName = "C"

Dim listing As List(Of Employee)
dim flatted as string

最后我想得到

 flatted = "A,B,C"

重点是我想使用 linq （vb或c＃）来实现

Answer 1

这是如何在C＃中完成的。我使用的是一个稍微不同的类（Person，而不是Employee），但代码最终会相同。

// Make some experimental data...  
List<Person> peeps = new List<Person>()
{
    new Person() { FirstName = "Frank", LastName = "Jax" },
    new Person() { FirstName = "Anne", LastName = "Wax" },
};

// This will select all of the last names from the list of people, and join them with commas.
string lastNames = string.Join(",", (from x in peeps select x.LastName));

和班级列表，为好奇。

public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

Answer 2

以下内容应该有效：

List<Person> people = new List<Person>();
        people.Add(new Person() { LastName = "A" });
        people.Add(new Person() { LastName = "B" });
        people.Add(new Person() { LastName = "C" });

        var lastNames = (from person in people
                         select person.LastName);

        var result = string.Join(",", lastNames);
        Console.WriteLine(result);

使用linq从列表中的对象的属性值构建字符串

2 个答案: