C# |获取排序列表对象指定索引处的键
原文:https://www . geeksforgeeks . org/c-sharp-按指定的排序索引获取关键字列表对象/
排序列表。GetKey(Int32)方法用于获取 SortedList 对象指定索引处的键。
语法:
public virtual object GetKey (int index);
这里，索引是要获取的密钥的从零开始的索引。
返回值:该方法返回 SortedList 对象指定索引处的键。
异常:如果索引在 SortedList 对象的有效索引范围之外，此方法将抛出ArgumentOutOfRangeException 。
以下程序说明了上述方法的使用:
例 1:
// C# code to get the key at
// the specified index of a
// SortedList object
using System;
using System.Collections;
class Geeks {
// Main Method
public static void Main(String[] args)
{
// Creating a SortedList of integers
SortedList mylist = new SortedList();
// Adding elements to SortedList
mylist.Add("key1", "C++");
mylist.Add("key2", "Java");
mylist.Add("key3", "DSA");
mylist.Add("key4", "Python");
mylist.Add("key5", "C#");
// storing the value of
// index that needed by
// used into a variable
int i = 2;
// getting the key at index 2
Console.WriteLine("Key at index {0} is {1}",
i, mylist.GetKey(i));
}
}
输出:
Key at index 2 is key3
例 2:
// C# code to get the key at
// the specified index of a
// SortedList object
using System;
using System.Collections;
class Geeks {
// Main Method
public static void Main(String[] args)
{
// Creating a SortedList of integers
SortedList mylist = new SortedList();
// Adding elements to SortedList
mylist.Add("First", "Ram");
mylist.Add("Second", "Shyam");
mylist.Add("Third", "Mohit");
mylist.Add("Fourth", "Rohit");
mylist.Add("Fifth", "Manish");
// storing the value of
// index that needed by
// used into a variable
// it will throw an exception
// as index is out of range of
// valid indexes of SortedList object
int i = 7;
// getting the key at index 7
Console.WriteLine("Key at index {0} is {1}",
i, mylist.GetKey(i));
}
}
运行时错误:
未处理异常: 系统。ArgumentOutOfRangeException:索引超出范围。必须是非负的，并且小于集合的大小。 参数名称:索引
参考:
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