C#中的Queue.CopyTo()方法用于从指定的数组索引处开始，将Queue元素复制到现有的一维数组。
语法如下-
public virtual void CopyTo (Array arr, int index);
上面的参数arr是一维数组，它是从Queue复制的元素的目的地。index参数是开始复制的数组中从零开始的索引。
现在让我们看一个例子-
using System;
using System.Collections.Generic;
public class Demo {
public static void Main() {
Queue<int> queue = new Queue<int>();
queue.Enqueue(100);
queue.Enqueue(200);
queue.Enqueue(300);
Console.Write("Count of elements = ");
Console.WriteLine(queue.Count);
Console.WriteLine("Queue...");
foreach(int i in queue) {
Console.WriteLine(i);
}
Console.WriteLine("Does the queue has element 500? = "+queue.Contains(500));
int[] intArr = new int[5];
intArr[0] = 1;
intArr[1] = 2;
intArr[2] = 3;
intArr[3] = 4;
queue.CopyTo(intArr, 1);
Console.WriteLine("\nQueue (Updated)");
foreach(int i in queue) {
Console.WriteLine(i);
}
Console.WriteLine("\nArray (Updated)");
foreach(int i in intArr) {
Console.WriteLine(i);
}
}
}输出结果
这将产生以下输出-
Count of elements = 3 Queue... 100 200 300 Does the queue has element 500? = False Queue (Updated) 100 200 300 Array (Updated) 1 100 200 300 0
现在让我们来看另一个示例-
using System;
using System.Collections.Generic;
public class Demo {
public static void Main() {
Queue<string> queue = new Queue<string>();
queue.Enqueue("Tim");
queue.Enqueue("Jack");
queue.Enqueue("Nathan");
queue.Enqueue("Tom");
queue.Enqueue("David");
queue.Enqueue("Mark");
Console.Write("Count of elements = ");
Console.WriteLine(queue.Count);
Console.WriteLine("Queue...");
foreach(string i in queue) {
Console.WriteLine(i);
}
string[] strArr = new string[10];
strArr[0] = "AB";
strArr[1] = "BC";
strArr[2] = "DE";
strArr[3] = "EF";
queue.CopyTo(strArr, 1);
Console.WriteLine("\nQueue (Updated)");
foreach(string i in queue) {
Console.WriteLine(i);
}
Console.WriteLine("\nArray (Updated)");
foreach(string i in strArr) {
Console.WriteLine(i);
}
}
}输出结果
这将产生以下输出-
Count of elements = 6 Queue... Tim Jack Nathan Tom David Mark Queue (Updated) Tim Jack Nathan Tom David Mark Array (Updated) AB Tim Jack Nathan Tom David Mark