要获取数组指定维度中的元素总数，代码如下：示例 在线演示using System; public class Demo {    public static void Main() {       string[] products = new string[] { "Andy", "Mark", "Gary", "Andre"};       Console.WriteLine("一个或多个名称以 'A' 开头？= {0}",       Array.Exists(products, ele => ele.StartsWith("A")));       Console.WriteLine("数组是否具有固定大小？= " + products.IsFixedSize);       Console.WriteLine("数组是否只读？= " + products.IsReadOnly);       Console.WriteLine("数组是否同步？= " + products.IsSynchronized); ... 阅读更多

要将 SortedList 对象的容量设置为实际元素数量，代码如下：示例 在线演示using System; using System.Collections; public class Demo {    public static void Main(String[] args) {       SortedList sortedList = new SortedList();       sortedList.Add("A", "1");       sortedList.Add("B", "2");       sortedList.Add("C", "3");       sortedList.Add("D", "4");       sortedList.Add("E", "5");       sortedList.Add("F", "6");       sortedList.Add("G", "7");       sortedList.Add("H", "8");       sortedList.Add("I", "9");       sortedList.Add("J", "10");       Console.WriteLine("SortedList 元素...");     ... 阅读更多

要将 ArrayList 的容量设置为实际元素数量，代码如下：示例 在线演示using System; using System.Collections; public class Demo {    public static void Main(String[] args) {       ArrayList list1 = new ArrayList();       list1.Add("A");       list1.Add("B");       list1.Add("C");       list1.Add("D");       list1.Add("E");       list1.Add("F");       list1.Add("G");       list1.Add("H");       list1.Add("I");       Console.WriteLine("ArrayList1 中的元素...");       foreach (string res in list1) {          Console.WriteLine(res);     ... 阅读更多

要搜索满足条件的元素，并返回整个 List 中最后一个匹配项的从零开始的索引，代码如下：示例 在线演示using System; using System.Collections.Generic; public class Demo {    private static bool demo(int i) {       return ((i % 10) == 0);    }    public static void Main(String[] args) {       List list = new List();       list.Add(200);       list.Add(215);       list.Add(310);       list.Add(500);       list.Add(600);       Console.WriteLine("List 元素...");       foreach (int i in ... 阅读更多

要搜索集合中指定对象的索引，代码如下：示例 在线演示using System; using System.Collections.Specialized; public class Demo {    public static void Main() {       StringCollection strCol = new StringCollection();       strCol.Add("Accessories");       strCol.Add("Books");       strCol.Add("Electronics");       strCol.Add("Books");       Console.WriteLine("StringCollection 元素...");       foreach (string res in strCol) {          Console.WriteLine(res);       }       strCol.Insert(2, "Headphone");       Console.WriteLine("StringCollection 元素...已更新");       foreach (string res in strCol) {          Console.WriteLine(res); ... 阅读更多

要获取 BitArray 中包含的元素数量，代码如下：示例 在线演示using System; using System.Collections; public class Demo {    public static void Main() {       BitArray arr1 = new BitArray(5);       BitArray arr2 = new BitArray(5);       arr1[0] = false;       arr1[1] = false;       arr2[0] = false;       arr2[1] = true;       Console.WriteLine("BitArray1 元素...");       foreach (bool res in arr1) {          Console.WriteLine(res);       }       Console.WriteLine("BitArray2 元素...");     ... 阅读更多

要检查线程是否处于活动状态，代码如下：示例 在线演示using System; using System.Threading; public class Demo {    public static void Main() {       Thread thread = new Thread(new ThreadStart(demo1));       thread = Thread.CurrentThread;       Console.WriteLine("线程是否处于活动状态？= "+thread.IsAlive);       ThreadPool.QueueUserWorkItem(new WaitCallback(demo2));       Console.WriteLine("线程的当前状态 = "+thread.ThreadState);       Console.WriteLine("ManagedThreadId = "+thread.ManagedThreadId);       thread.IsBackground = true;       Console.WriteLine("线程是否为后台线程？= "+thread.IsBackground);    }    public static void demo1() {     ... 阅读更多

要搜索 SortedList 对象，代码如下：示例 在线演示using System; using System.Collections; public class Demo {    public static void Main() {       SortedList list = new SortedList();       list.Add("1", "One");       list.Add("2", "Two");       list.Add("3", "Three");       list.Add("4", "Four");       list.Add("5", "Five");       list.Add("6", "Six");       list.Add("7", "Seven");       list.Add("8", "Eight");       Console.WriteLine("SortedList 的键和值....");       foreach(DictionaryEntry k in list )       Console.WriteLine("键: {0}, 值: {1}", k.Key , k.Value ... 阅读更多

要检查线程是否为后台线程，代码如下：示例 在线演示using System; using System.Threading; public class Demo {    public static void Main() {       Thread thread = new Thread(new ThreadStart(demo1));       ThreadPool.QueueUserWorkItem(new WaitCallback(demo2));       Console.WriteLine("线程的当前状态 = "+thread.ThreadState);       Console.WriteLine("ManagedThreadId = "+thread.ManagedThreadId);       Console.WriteLine("线程是否为后台线程？= "+Thread.CurrentThread.IsBackground);    }    public static void demo1() {       Thread.Sleep(2000);    }    public static void demo2(object stateInfo) {       Console.WriteLine("线程属于托管线程 ... 阅读更多

要获取 C# 中 HashSet 中的元素数量，代码如下：示例 在线演示using System; using System.Collections.Generic; public class Demo {    public static void Main() {       HashSet set1 = new HashSet();       set1.Add(25);       set1.Add(50);       set1.Add(75);       set1.Add(100);       set1.Add(125);       set1.Add(150);       Console.WriteLine("HashSet1 中的元素");       foreach(int val in set1) {          Console.WriteLine(val);       }       Console.WriteLine("HashSet1 中的元素数量 = "+set1.Count);       HashSet set2 ... 阅读更多