[英]Select data from the list and display it in the listBox, C#
所以,我为员工制作了这个课程,现在我需要从列表中进行选择,例如所有 25 岁或以上的开发人员,让我们说,也按姓名排序,以显示在我创建的列表框中。 到目前为止没有成功,我知道我必须使用 Linq,并写一些类似的东西
private void button1_Click(object sender, EventArgs e)
{
var query = Employee.Where(Employee => employee.Age > 25);
}
但是它给了我 Where 的错误,它无法识别语法。 另外,我不知道如何选择其他数据。
public class Employee
{
public string Name { get; set; }
public int Age { get; set; }
public string Company { get; set; }
public string Position { get; set; }
public override string ToString()
{
return string.Format("{0} {1}", Name, Age);
}
}
public class Program
{
public static void Main()
{
List<Employee> personList = new List<Employee>()
{
new Employee(){ Name="Steve", Age =23, Position="Developer"},
new Employee(){ Name="Mark", Age =32, Position="Designer"},
new Employee(){ Name="Bill", Age =23, Position="Developer"},
new Employee(){ Name="Nill", Age =25, Position="Analyst"},
new Employee(){ Name="Kevin", Age =28, Position="Analyst"},
new Employee(){ Name="Steve", Age =22, Position="Designer"}
};
}
}
好吧,如果您想选择集合的特定字段,您应该这样写:
personList
.Where(x => x.Age > 25) //This is where your conditions should be
.OrderBy(x => x.Name) //That's how you order your collection
.Select(x => new //And that's the part where you select your fields
{
Text = x.Name,
Age = x.Age
});
基本上通过这种选择,您可以创建匿名对象。
但是要填充选择列表,您不应该创建匿名对象,而是创建特定的枚举,您也可以使用 linQ:
personList
.Where(x => x.Age > 25)
.Select(x => new ListItem //note that here you create ListItem
{
Text = x.Name,
Value = x.Age
});
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