要检查指定的 Unicode 字符是否为字母或十进制数字，代码如下所示：示例 在线演示using System; public class Demo {    public static void Main() {       bool res;       char val = '1';       Console.WriteLine("Value = "+val);       res = Char.IsLetterOrDigit(val);       Console.WriteLine("Is the value a letter or digit? = "+res);    } }输出这将产生以下输出：Value = 1 Is the value a letter or digit? = True示例让我们来看另一个示例： 在线演示using System; public class Demo {    public static void Main() {       bool res; ... 阅读更多

要获取值类型 Char 的 TypeCode，代码如下所示：示例 在线演示using System; public class Demo {    public static void Main() {       char val = '5';       bool res;       Console.WriteLine("Hashcode for val = "+val.GetHashCode());       res = val.Equals('m');       Console.WriteLine("Return Value = "+res);       Console.WriteLine("Numeric Value = "+Char.GetNumericValue(val));       TypeCode type = val.GetTypeCode();       Console.WriteLine("Type = "+type);    } }输出这将产生以下输出：Hashcode for val = 3473461 Return Value = False Numeric Value = 5 Type = Char示例让我们来看另一个示例： 在线演示using System; public class ... 阅读更多

要从 SortedList 的指定索引中删除元素，代码如下所示：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 elements...");       foreach(DictionaryEntry d in sortedList) ... 阅读更多

要从 StringDictionary 中删除具有指定键的条目，代码如下所示：示例 在线演示using System; using System.Collections; using System.Collections.Specialized; public class Demo {    public static void Main() {       StringDictionary strDict1 = new StringDictionary();       strDict1.Add("A", "John");       strDict1.Add("B", "Andy");       strDict1.Add("C", "Tim");       strDict1.Add("D", "Ryan");       strDict1.Add("E", "Kevin");       strDict1.Add("F", "Katie");       strDict1.Add("G", "Brad");       Console.WriteLine("StringDictionary1 key-value pairs...");       foreach(DictionaryEntry de in strDict1) {          Console.WriteLine(de.Key + " " + de.Value);     ... 阅读更多

要从 C# 中的 OrdererdDictionary 中删除具有指定键的条目，代码如下所示：示例 在线演示using System; using System.Collections; using System.Collections.Specialized; public class Demo {    public static void Main() {       OrderedDictionary dict = new OrderedDictionary();       dict.Add("A", "Books");       dict.Add("B", "Electronics");       dict.Add("C", "Smart Wearables");       dict.Add("D", "Pet Supplies");       dict.Add("E", "Clothing");       dict.Add("F", "Footwear");       Console.WriteLine("OrderedDictionary elements...");       foreach(DictionaryEntry d in dict) {          Console.WriteLine(d.Key + " " + d.Value);       }   ... 阅读更多

要获取队列开头的对象，代码如下所示：示例 在线演示using System; using System.Collections.Generic; public class Demo {    public static void Main() {       Queue queue = new Queue();       queue.Enqueue("A");       queue.Enqueue("B");       queue.Enqueue("C");       queue.Enqueue("D");       queue.Enqueue("E");       queue.Enqueue("F");       queue.Enqueue("G");       Console.WriteLine("Count of elements = "+queue.Count);       Console.WriteLine("Element at the beginning of queue = " + queue.Peek());    } }输出这将产生以下输出：Count of elements = 7 Element at the beginning of queue = A示例让我们来看另一个 ... 阅读更多

要获取或设置 SortedList 中与指定键关联的值，代码如下所示：示例 在线演示using System; using System.Collections; public class Demo {    public static void Main() {       SortedList list = new SortedList ();       list.Add("A", "Books");       list.Add("B", "Electronics");       list.Add("C", "Appliances");       list.Add("D", "Pet Supplies");       list.Add("E", "Clothing");       list.Add("F", "Footwear");       Console.WriteLine("Value associated with key E = "+list["E"]);       list["E"] = "HDD";       Console.WriteLine("Value associated with key E [Updated] = "+list["E"]);   ... 阅读更多

要检查两个 StringDictionary 对象是否相等，代码如下所示：示例 在线演示using System; using System.Collections.Specialized; public class Demo {    public static void Main() {       StringDictionary strDict1 = new StringDictionary();       strDict1.Add("A", "John");       strDict1.Add("B", "Andy");       strDict1.Add("C", "Tim");       strDict1.Add("D", "Ryan");       strDict1.Add("E", "Kevin");       strDict1.Add("F", "Katie");       strDict1.Add("G", "Brad");       StringDictionary strDict2 = new StringDictionary();       strDict2.Add("A", "John");       strDict2.Add("B", "Andy");       strDict2.Add("C", "Tim");       strDict2.Add("D", ... 阅读更多

要检查两个 StringCollection 对象是否相等，代码如下所示：示例 在线演示using System; using System.Collections.Specialized; public class Demo {    public static void Main() {       StringCollection strCol1 = new StringCollection();       strCol1.Add("Accessories");       strCol1.Add("Books");       strCol1.Add("Electronics");       Console.WriteLine("StringCollection1 elements...");       foreach (string res in strCol1) {          Console.WriteLine(res);       }       StringCollection strCol2 = new StringCollection();       strCol2.Add("Accessories");       strCol2.Add("Books");       strCol2.Add("Electronics");       Console.WriteLine("StringCollection2 elements...");       foreach ... 阅读更多

要在ListDictionary中获取或设置与指定键关联的值，代码如下：示例 在线演示使用 System; using System.Collections; using System.Collections.Specialized; public class Demo {    public static void Main() {       ListDictionary dict = new ListDictionary();       dict.Add("A", "Books");       dict.Add("B", "Electronics");       dict.Add("C", "Appliances");       dict.Add("D", "Pet Supplies");       dict.Add("E", "Clothing");       dict.Add("F", "Footwear");       Console.WriteLine("Value associated with key C = "+dict["C"]);    } }输出这将产生以下输出：值与键C关联 = Appliances示例让我们来看另一个例子 - 在线演示使用 System; using ... 阅读更多