.NET(C#) 使用范围(range)索引获取子列表或数组

1、使用范围(range)索引获取数组

var array = new string[] { "C/C++/C#", "Java", "Python" };
var subArray = array[0..1]; 
Console.WriteLine(subArray[0]);
Console.WriteLine(subArray[1]);

2、使用范围(range)索引获取列表

列表本身不支持范围，可以创建扩展方法实现：

public static class ListExtensions
{
    public static List<T> GetRange<T>(this List<T> list, Range range)
    {
        var (start, length) = range.GetOffsetAndLength(list.Count);
        return list.GetRange(start, length);
    }
}

调用方法：

var list = new List<string> { "C/C++/C#", "Java", "Python" };
var subList = list.GetRange(0..1);
Console.WriteLine(subList[0]);
Console.WriteLine(subList[1]);

或者

使用ToArray()实现范围索引：

var list = new List<string> { "C/C++/C#", "Java", "Python" };
var subList = list.ToArray()[0..1]; 
Console.WriteLine(subList[0]);
Console.WriteLine(subList[1]);

或者

var list = new List<string>  { "C/C++/C#", "Java", "Python" };
var subList = list.GetRange(0,1);
Console.WriteLine(subList[0]);
Console.WriteLine(subList[1]);