Skip to main content

Sort Dictionary Based On Value In Asp.Net And C#.Net | Convert Dictionary into KeyValuePair or KeyValuePair into Dictionary.

By Anonymous
In this tutorial i am going to explain about how to sort dictionary object based on value in asp.net and C#.Net or convert unsorted dictionary to sorted dictionary object in C#.Net and VB.Net or Convert Dictionary into KeyValuePair or KeyValuePair into Dictionary.

In my previous article i have explained about Get All Coutries From System.Globalization Namespace , Web Api Model Validation Using Validation Filters , Convert String To Upper,Lower & Title(Proper) Case Using TextInfo Class Build Products Comparision Table/Grid In ASP.Net , Store Custom Objects In Configuration File , Create Simple Mathmatical Captcha In ASP.Net and many articles in ASP.Net,C#.Net,VB.Net,Grid View,Javascript,jQuery,SQL Server and many other topics.

In this tutorial for explaining about how to sort dictionary object based on value in ASP.Net and C#.Net i have created a dictionary object and addede some items into the dictionary object. Then i converted into KeyValuePair object using Dictionary.ToList() method and then using Sort and delegate method i sorted the KeyValuePAir object and then again converted back into Dictionary object before binding it to the dropdownlist.Below is the HTML Markup i used.

HTML Markup:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h2>Sorting Dictionary By Value</h2>
       <asp:DropDownList ID="ddlCountries" runat="server" Width="200">    
        </asp:DropDownList>
    </div>
    </form>
</body>
</html>

Below is the code behind file code.

C#.Net:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Dictionary<string, string> objCountries = new Dictionary<string, string>();
       
        //Adding countries to dictionary in random order
        objCountries.Add("India", "India");
        objCountries.Add("America", "America");
        objCountries.Add("Canada", "Canada");
        objCountries.Add("Britain", "Britain");
        objCountries.Add("New Zealand", "New Zealand");
        objCountries.Add("Nepal", "Nepal");
        objCountries.Add("Myanmar", "Myanmar");
        objCountries.Add("China", "China");
        objCountries.Add("Singapore", "Singapore");

        //Sorting the countries in the dictionary object based on value
        List<KeyValuePair<string, string>> mySortedList = objCountries.ToList();

        mySortedList.Sort(
            delegate(KeyValuePair<string, string> firstPair,
            KeyValuePair<string, string> nextPair)
            {
                return firstPair.Value.CompareTo(nextPair.Value);
            }
        );

        Dictionary<string, string> objSortedCountries = new Dictionary<string, string>();
       
        //Converting KeyValuePair to Dictionary Object
        objSortedCountries = mySortedList.ToDictionary(x => x.Key, x => x.Value);

        //Binding Dictionary Object To DropDownList
        ddlCountries.DataSource = objSortedCountries;
        ddlCountries.DataTextField = "Value";
        ddlCountries.DataValueField = "Key";
        ddlCountries.DataBind();
        //Default Record
        ddlCountries.Items.Insert(0, new ListItem("Select Countries", ""));
    }
}

VB.Net Code:
Imports System.Collections.Generic
Imports System.Linq
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls

Partial Public Class Default2
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(sender As Object, e As EventArgs)
        Dim objCountries As New Dictionary(Of String, String)()

        'Adding countries to dictionary in random order
        objCountries.Add("India", "India")
        objCountries.Add("America", "America")
        objCountries.Add("Canada", "Canada")
        objCountries.Add("Britain", "Britain")
        objCountries.Add("New Zealand", "New Zealand")
        objCountries.Add("Nepal", "Nepal")
        objCountries.Add("Myanmar", "Myanmar")
        objCountries.Add("China", "China")
        objCountries.Add("Singapore", "Singapore")

        'Sorting the countries in the dictionary object based on value
        Dim mySortedList As List(Of KeyValuePair(Of String, String)) = objCountries.ToList()

        mySortedList.Sort(Function(firstPair As KeyValuePair(Of String, String), nextPair As KeyValuePair(Of String, String)) firstPair.Value.CompareTo(nextPair.Value))

        Dim objSortedCountries As New Dictionary(Of String, String)()

        'Converting KeyValuePair to Dictionary Object
        objSortedCountries = mySortedList.ToDictionary(Function(x) x.Key, Function(x) x.Value)

        'Binding Dictionary Object To DropDownList
        ddlCountries.DataSource = objSortedCountries
        ddlCountries.DataTextField = "Value"
        ddlCountries.DataValueField = "Key"
        ddlCountries.DataBind()
        'Default Record
        ddlCountries.Items.Insert(0, New ListItem("Select Countries", ""))
    End Sub
End Class

If you run the application you will get the below output.
Output of Sort Dictionary Based On Value In Asp.Net And C#.Net | Convert Dictionary into KeyValuePair or KeyValuePair into Dictionary.
SourceCode:
Source Code of Sort Dictionary Based On Value In Asp.Net And C#.Net | Convert Dictionary into KeyValuePair or KeyValuePair into Dictionary.
If you like this article then share with your friends and comment your valuable feedback.. Happy coding..

You May Also Like...

Labels:

Comments

Post a Comment

Popular posts from this blog

Code To Convert rupees(numbers) into words using C#.Net

By
Introduction: In my previous article I have explained about how to validate emailid using javascript . In this article I am going to explain about code used to convert rupees(numbers) into words using C#.Net . Explanation: For explanation purpose I have a page. It has a textbox to input the numbers. And when you click on the convert to words button then it will convert the input numbers into words and shows it in the below label. Below is the C# code used to do this functionality. public static string NumbersToWords( int inputNumber) {     int inputNo = inputNumber;     if (inputNo == 0)         return "Zero" ;     int [] numbers = new int [4];     int first = 0;     int u, h, t;     System.Text. StringBuilder sb = new System.Text. StringBuilder ();     if (inputNo < 0)     { ...
16 comments
Read More...

C# Extension Methods Example

By
In this article i am going to explain about Extension Methods  with example. Extension methods enable you to "add" methods to existing types without creating a new derived type, recompiling, or otherwise modifying the original type. Extension methods are a special kind of static method, but they are called as if they were instance methods on the extended type. For client code written in C# and Visual Basic, there is no apparent difference between calling an extension method and the methods that are actually defined in a type. If you do implement extension methods for a given type, remember the following points: An extension method will never be called if it has the same signature as a method defined in the type. Extension methods are brought into scope at the namespace level. For example, if you have multiple static classes that contain extension methods in a single namespace named Extensions, they will all be brought into scope by the using Extensions; directive. ...
Post a Comment
Read More...

VBScript equivalent string functions in C#.Net

By
C# Method VBScript Description IndexOf() InStr Returns the position of the first occurrence of one string within another. The search begins at the first character of the string - InStrRev Returns the position of the first occurrence of one string within another. The search begins at the last character of the string ToLower() LCase Converts a specified string to lowercase SubString() Left Returns a specified number of characters from the left side of a string Length() Len Returns the number of characters in a string TrimStart() LTrim Removes spaces on the left side of a string TrimEnd() RTrim Removes spaces on the right side of a string Trim() Trim Removes spaces on both the left and the right side of a string SubString() M...
Post a Comment
Read More...