Usage of Hashtable in C #

First, start with the namespace

System.Collections

Then get to the point.

Common methods and properties of Hashtable:

01: Common Properties

Property name	Description
Count	Gets the number of key/value pairs contained in the Hashtable
Keys	Gets the collection of keys contained in the Hashtable
Values	Gets the collection that contains the values in the Hashtable

　　　　　　　　　　　　　　　　　　　　　　　　　　　

02: Common Methods

return value type	Method name	Description
void	ADD (Object key,object value)	Adds the specified key and the merit element to the Hashtable
void	Remove (Object Key)	Remove an element with a specific key from the Hashtable
void	Clear ()	Remove all elements from the Hashtable

Well, the light says no practice fake bashi, on the code

Class program    {        static void Main (string[] args)        {            //Create a Hashtable instance            Hashtable ht=new Hashtable () ;              Add the KeyValue key value to            ht. ADD ("A", "1");            Ht. ADD ("B", "2");            Ht. ADD ("C", "3");            Ht. ADD ("D", "4");             Traversing a hash table can only be traversed with foreach, because Hashtable cannot be accessed with an index
            Traverse key
            foreach (Object item in HT. Keys)
            {

                Console.WriteLine (string) item);

            }

            Traverse value

            foreach (Object item in HT. Value)
            {
                

                Console.WriteLine (string) item);

            }

 
 
 foreach (DictionaryEntry de in HT) {Console.WriteLine ("Key--{0}; Value--{1}. ", De. Key, DE.            Value); } 
//hash table sort ArrayList akeys=new ArrayList (ht.             Keys); Akeys.            Sort ();             foreach (string skey in Akeys) {Console.WriteLine ("{0, -15} {1, -15}", Skey, Ht[skey]); }//Determines if the hash table contains a specific key with a return value of TRUE or False if (HT.                         Contains ("a")) Console.WriteLine (ht["a");             Assign a value to the corresponding key ht["A"] = "Hello"; Removes a KeyValue key value pair ht.             Remove ("C"); Traversal hash table foreach (DictionaryEntry de in HT) {Console.WriteLine ("Key--{0}; Value--{1}. ", De. Key, DE.            Value); }//Remove all element ht.               Clear ();            There will be no output Console.WriteLine (ht["A"]);        Console.readkey (); }} 
 
 

Source: https://www.cnblogs.com/hfddz/p/6534235.html

Usage of Hashtable in C #