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Posted 2 May 2011

WPF: CountryFlag Control

, 30 Aug 2016 CPOL
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A WPF user control for displaying a country's flag


The CountryFlag user control, as the name suggests, can be used to diplay the flag of a country in a WPF application. A flag is specified using a country's ISO 3166-1 alpha-2 country code.


Your project's target framework should be .NET Framework 4.6 or higher.


To use the CountryFlag control first install it by running the following command in the NuGet Package Manager Console,

PM> Install-Package CountryFlag

You can also install it by using the NuGet Package Manager. In Solution Explorer right-click your project, select Manage NuGet Packages, and from the Browse tab search for "countyflag" and install.

When installation is complete you can now add a XAML reference and add the control/s to a layout control. To specify a flag set the control's Code property.

<Window x:Class="Flags.MainWindow"
            <cf:CountryFlag Code="BT" Margin="5"/>
            <cf:CountryFlag Code="AF" Margin="5"/>
            <cf:CountryFlag Code="AO" Margin="5"/>
            <cf:CountryFlag Code="BB" Margin="5"/>
            <cf:CountryFlag Code="KE" Margin="5"/>
            <cf:CountryFlag Code="BR" Margin="5"/>
            <cf:CountryFlag Code="EG" Margin="5"/>
            <cf:CountryFlag Code="RS" Margin="5"/>
            <cf:CountryFlag Code="SZ" Margin="5"/>

The above code declares nine flag controls with their Code property set to the ISO 3166 code of a specific country. The Code property is set to a value of type CountryCode, an enumeration of ISO 3166 country codes specified in the control library. The following image shows the result of the above markup, in the artboard of the XAML Designer,


The code behind for the user control contains a single dependency property and a callback method,

Class CountryFlag
    Public Property Code() As CountryCode
            Return CType(GetValue(CodeProperty), CountryCode)
        End Get
        Set(ByVal value As CountryCode)
            SetValue(CodeProperty, value)
        End Set
    End Property

    Public Shared CodeProperty As DependencyProperty =
        DependencyProperty.Register("Code", GetType(CountryCode), GetType(CountryFlag),
                                    New PropertyMetadata(CountryCode.AD,
                                                         New PropertyChangedCallback(AddressOf ChangeFlag)))

    Private Shared Sub ChangeFlag(ByVal source As DependencyObject, ByVal e As DependencyPropertyChangedEventArgs)
        Dim cCode = CType(e.NewValue, CountryCode).ToString()
        Dim flag = "Flags/" & cCode.ToLower() & ".png"
        CType(source, CountryFlag).Flag.Source = New BitmapImage(New Uri(flag, UriKind.Relative))
    End Sub
End Class

In the callback method the value of the property is used to set the source property of an Image control.


You can download the sample project from the link at the top of the article page. The project contains the sample code highlighted earlier.


  • 3rd May 2011: Initial post
  • 30th August 2016: Updated code and flags


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Meshack Musundi
Software Developer
Kenya Kenya
Meshack has about 7 years of programming experience initially starting off with Java before shifting to .NET, thanks to the allure of WPF.


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Comments and Discussions

GeneralMy vote of 5 Pin
BeeWayDev9-Dec-11 6:34
memberBeeWayDev9-Dec-11 6:34 
GeneralRe: My vote of 5 Pin
Meshack Musundi12-Jan-12 5:54
mvpMeshack Musundi12-Jan-12 5:54 

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