从Ilist获得Idictionnary

Question

如何将IDictionnay形成IList

Answer 1

您可以使用Linq通过使用ToDictionary扩展方法轻松地从列表中获取字典并提供表达式以获取密钥 - 例如

internal class Program
{
    private static void Main(string[] args)
    {
        IList<Person> list = new List<Person> {new Person("Bob", 40), new Person("Jill", 35)};
        IDictionary<string, Person> dictionary = list.ToDictionary(x => x.Name);
    }
}

public class Person
{
    private readonly int _age;
    private readonly string _name;

    public Person(string name, int age)
    {
        _name = name;
        _age = age;
    }

    public int Age
    {
        get { return _age; }
    }

    public string Name
    {
        get { return _name; }
    }
}

或者,正如Jon所指出的,如果您需要为Dictionary条目使用不同的值,您还可以指定第二个表达式来获取值 - 如下所示:

IDictionary<string, int> dictionary2 = list.ToDictionary(x => x.Name, x => x.Age);