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C# Dictionary

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> In this post, we will see how to use a dictionary in C#.
> A dictionary in C# is used to store collection of values with key values as pair.
> So whenever user wants to get the value then he will have to pass the key value to the dictionary and it will return the value to the user.
> The namespace of the C# dictionary is System.Collections.Generic.
> Let’s take a simple example of storing digits from 0 to 9 as key value and these digits in the word form as the collection values.
> Here, the user will type a digit from 0 to 9 and on clicking the button, it gives the digit in the word form.
> To keep this example simple, here the dictionary will be having digits from 0 to 9 only and if user enters a value less than 0 or greater than 9 then he will get the appropriate message.
> Following is the code for demonstrating the use of the Dictionary:


HTML Code:

<body>
   <form id="form1" runat="server">
       <div>
           Enter a number:
           <asp:TextBox ID="txtDigit" runat="server"></asp:TextBox>
           <asp:Button ID="btnGet" runat="server" Text="Get" OnClick="btnGet_Click" />
       </div>
       <br />
       <div id="output" runat="server"></div>
   </form>
</body>

C# code:

//method to get the digit in the word form using the C# dictionary
   protected string GetDigitInWord(int digit)
   {
       string word="Enter a single digit from 0 to 9 only";
      
       //declaring the dictionary
       Dictionary<int, string> dict = new Dictionary<int, string>();
       if (digit >= 0 && digit <= 9)
       {
           //adding values to dictionary with key
           dict.Add(0, "Zero");
           dict.Add(1, "One");
           dict.Add(2, "Two");
           dict.Add(3, "Three");
           dict.Add(4, "Four");
           dict.Add(5, "Five");
           dict.Add(6, "Six");
           dict.Add(7, "Seven");
           dict.Add(8, "Eight");
           dict.Add(9, "Nine");

           //getting digit in word by passing digit as key value
           word = dict[digit];
       }
       
       return word;
   }

protected void btnGet_Click(object sender, EventArgs e)
   {
       int digit = Convert.ToInt32(txtDigit.Text);
       //calling above method by passing the entered digit and getting its word form
       output.InnerText= this.GetDigitInWord(digit);
   }

Output:

Output 1: Entering digit greater than 9 and getting message.


Output 2: Entering 3 as value and getting its word form:

That's it....

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