C# 中的 Array.LastIndexOf() 方法
C# 中的 Array.LastIndexOf() 方法用于查找指定对象,并返回其在整个一维数组中最后一次出现的索引。
语法
public static int LastIndexOf (Array arr, object val);
上述内容中,arr 是要搜索的一维数组,而 val 是要在 arr 中查找的对象。
示例
using System; public class Demo { public static void Main() { string[] strArr = {"John", "Tim", "Fedric", "Gary", "Harry", "Damien", "David", "Harry"}; Array.Sort(strArr); Console.WriteLine("Array elements..."); foreach(string s in strArr) { Console.WriteLine(s); } Console.Write("Element Gary is at index = " + Array.BinarySearch(strArr, "Gary")); Console.Write("
Element Tom is at index = " + Array.BinarySearch(strArr, "Tom")); Console.Write("
Last index of element Harry = " + Array.LastIndexOf(strArr, "Harry")); } }
输出
Array elements... Damien David Fedric Gary Harry Harry John Tim Element Gary is at index = 3 Element Tom is at index = -9 Last index of element Harry = 5
示例
using System; public class Demo { public static void Main() { int[] intArr = {5, 10, 15, 20, 15, 25, 30}; Array.Sort(intArr); Console.WriteLine("Array elements..."); foreach(int i in intArr) { Console.WriteLine(i); } Console.Write("Element 25 is at index = " + Array.BinarySearch(intArr, 20)); Console.Write("
Last index of element 15 = " + Array.LastIndexOf(intArr, 15)); Console.Write("
Last index of element 50 = " + Array.LastIndexOf(intArr, 50)); } }
输出
Array elements... 5 10 15 15 20 25 30 Element 25 is at index = 4 Last index of element 15 = 3 Last index of element 50 = -1
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