C# Hashtable用法及代码示例

// C# program to create Hashtable
using System;
using System.Collections;
class GFG {
    // Main method
    static void Main(string[] args)
    {
        // create and initialize Hash table
        // using Add() method
        Hashtable g = new Hashtable();
        g.Add(1, "welcome");
        g.Add(2, "to");
        g.Add(3, "tutorials");
        g.Add(4, "of");
        g.Add(5, "C#");
        ICollection key = g.Keys;
        // Print Hash table
        Console.WriteLine("Hashtable:");
        Console.WriteLine();
        foreach(var val in key)
        {
            Console.WriteLine(val + "-" + g[val]);
        }
    }
}

// C# Program to illustrate the
// Properties of Hashtable
using System;
using System.Collections;
class GFG {
    // Main method
    static void Main(string[] args)
    {
        // create and initialize Hash table
        // using Add() method
        Hashtable has1 = new Hashtable();
        has1.Add("1", "Welcome");
        has1.Add("2", "to");
        has1.Add("3", "geeks");
        has1.Add("4", "for");
        has1.Add("5", "geeks");
        // --------- Using IsSynchronized Property 
        // Creating a synchronized packing
        // around the Hashtable
        Hashtable has2 = Hashtable.Synchronized(has1);
        // print the status of both Hashtables
        Console.WriteLine("has1 Hashtable is {0}.", 
             has1.IsSynchronized ? "synchronized" : 
                               "not synchronized");
        Console.WriteLine("has2 Hashtable is {0}.", 
             has2.IsSynchronized ? "synchronized" : 
                               "not synchronized");
        // --------- Using Count Property
        Console.WriteLine("Total Number of Elements in has1: "
                                                + has1.Count);
    }
}

// C# program to illustrate Add()
// and Remove() Methods
using System;
using System.Collections;
class Program {
    // Main method
    static void Main(string[] args)
    {
        // -------- Add() Method --------
        // create and initialize Hash table
        // using Add() method
        Hashtable g = new Hashtable();
        g.Add("1", "Welcome");
        g.Add("2", "to");
        g.Add("3", "Geeks");
        g.Add("4", "for");
        g.Add("5", "Geeks");
        ICollection key = g.Keys;
        // Print Hash table
        Console.WriteLine("Hashtable Contains:");
        foreach(var val in key)
        {
            Console.WriteLine(val + "-" + g[val]);
        }
        Console.WriteLine();
        // --------- Remove() Method ----------'
        // Remove element 4
        // using Remove() method
        g.Remove("4");
        // printing updated Hash table
        Console.WriteLine("Hashtable after removing element 4:");
        foreach(var val in key)
        {
            Console.WriteLine(val + "-" + g[val]);
        }
    }
}