C# Queue.TrimExcess() 方法和示例
C# 中的 Queue.TrimExcess() 方法用于将容量设置为 Queue<T> 中元素的实际数量,如果该数量小于当前容量的 90%。
语法
public void TrimExcess ();
示例
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); queue.Enqueue(400); queue.Enqueue(500); queue.Enqueue(600); queue.Enqueue(700); queue.Enqueue(800); queue.Enqueue(900); queue.Enqueue(1000); Console.WriteLine("Queue..."); foreach(int i in queue) { Console.WriteLine(i); } Console.WriteLine("Count of elements in the Queue = "+queue.Count); queue.Clear(); queue.TrimExcess(); Console.WriteLine("Count of elements in the Queue [Updated] = "+queue.Count); } }
输出
100 200 300 400 500 600 700 800 900 1000 Count of elements in the Queue = 10 Count of elements in the Queue [Updated] = 0
示例
using System; using System.Collections.Generic; public class Demo { public static void Main() { Queue<string> queue = new Queue<string>(); queue.Enqueue("Gary"); queue.Enqueue("Jack"); queue.Enqueue("Ryan"); queue.Enqueue("Kevin"); queue.Enqueue("Mark"); queue.Enqueue("Jack"); queue.Enqueue("Ryan"); queue.Enqueue("Kevin"); Console.Write("Count of elements = "); Console.WriteLine(queue.Count); Console.WriteLine("Does the queue has element Jack? = "+queue.Contains("Jack")); queue.TrimExcess(); queue.Clear(); Console.Write("Count of elements (updated) = "); Console.WriteLine(queue.Count); } }
输出
Count of elements = 8 Does the queue has element Jack? = True Count of elements (updated) = 0
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