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dictionary c#

Mohammad Asif 
// To initialize a dictionary, see below:
IDictionary<int, string> dict = new Dictionary<int, string>();
// Make sure to give it the right type of key and value

// To add values use 'Add()'
dict.Add(1,"One");
dict.Add(2,"Two");
dict.Add(3,"Three");

// You can also do this together with the creation
IDictionary<int, string> dict = new Dictionary<int, string>()
{
	{1,"One"},
	{2, "Two"},
	{3,"Three"}
};
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5
1
Nikhil Girraj 90 points 

                                    var cities = new Dictionary&lt;string, string&gt;(){
	{&quot;UK&quot;, &quot;London, Manchester, Birmingham&quot;},
	{&quot;USA&quot;, &quot;Chicago, New York, Washington&quot;},
	{&quot;India&quot;, &quot;Mumbai, New Delhi, Pune&quot;}
};

5 (1 Votes)
0
4.33
6
Jair Taylor 90 points 

                                    using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        Dictionary&lt;string, int&gt; dictionary = new Dictionary&lt;string, int&gt;();

        dictionary.Add(&quot;apple&quot;, 1);
        dictionary.Add(&quot;windows&quot;, 5);

        // See whether Dictionary contains this string.
        if (dictionary.ContainsKey(&quot;apple&quot;))
        {
            int value = dictionary[&quot;apple&quot;];
            Console.WriteLine(value);
        }

        // See whether it contains this string.
        if (!dictionary.ContainsKey(&quot;acorn&quot;))
        {
            Console.WriteLine(false);
        }
    }
}

4.33 (6 Votes)
0
4
2
Anonymous Entity 90 points 

                                            var students2 = new Dictionary&lt;int, StudentName&gt;()
        {
            [111] = new StudentName { FirstName=&quot;Sachin&quot;, LastName=&quot;Karnik&quot;, ID=211 },
            [112] = new StudentName { FirstName=&quot;Dina&quot;, LastName=&quot;Salimzianova&quot;, ID=317 } ,
            [113] = new StudentName { FirstName=&quot;Andy&quot;, LastName=&quot;Ruth&quot;, ID=198 }
        };

4 (2 Votes)
0
3.5
2
Anushua Gorai 90 points 

                                    var cities = new Dictionary&lt;string, string&gt;(){
	{&quot;UK&quot;, &quot;London, Manchester, Birmingham&quot;},
	{&quot;USA&quot;, &quot;Chicago, New York, Washington&quot;},
	{&quot;India&quot;, &quot;Mumbai, New Delhi, Pune&quot;}
};

Console.WriteLine(cities[&quot;UK&quot;]); //prints value of UK key
Console.WriteLine(cities[&quot;USA&quot;]);//prints value of USA key
//Console.WriteLine(cities[&quot;France&quot;]); // run-time exception: Key does not exist

//use ContainsKey() to check for an unknown key
if(cities.ContainsKey(&quot;France&quot;)){  
    Console.WriteLine(cities[&quot;France&quot;]);
}

//use TryGetValue() to get a value of unknown key
string result;

if(cities.TryGetValue(&quot;France&quot;, out result))
{
    Console.WriteLine(result);
}

//use ElementAt() to retrieve key-value pair using index
for (int i = 0; i &lt; cities.Count; i++)
{
    Console.WriteLine(&quot;Key: {0}, Value: {1}&quot;, 
                                            cities.ElementAt(i).Key, 
                                            cities.ElementAt(i).Value);
}

3.5 (2 Votes)
0
3.75
8
Blackwhitebeardbeard 95 points 

                                    IDictionary&lt;int, string&gt; numberNames = new Dictionary&lt;int, string&gt;();
numberNames.Add(1,&quot;One&quot;); //adding a key/value using the Add() method
numberNames.Add(2,&quot;Two&quot;);
numberNames.Add(3,&quot;Three&quot;);

//The following throws run-time exception: key already added.
//numberNames.Add(3, &quot;Three&quot;); 

foreach(KeyValuePair&lt;int, string&gt; kvp in numberNames)
    Console.WriteLine(&quot;Key: {0}, Value: {1}&quot;, kvp.Key, kvp.Value);
		
//creating a dictionary using collection-initializer syntax
var cities = new Dictionary&lt;string, string&gt;(){
	{&quot;UK&quot;, &quot;London, Manchester, Birmingham&quot;},
	{&quot;USA&quot;, &quot;Chicago, New York, Washington&quot;},
	{&quot;India&quot;, &quot;Mumbai, New Delhi, Pune&quot;}
};
		
foreach(var kvp in cities)
    Console.WriteLine(&quot;Key: {0}, Value: {1}&quot;, kvp.Key, kvp.Value);

3.75 (8 Votes)
0
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