How to Programmatically access Constants declared in your Xaml

If you have been looking out for a way to declare some constants in your xaml and then programmatically access them, then here’s a way I follow.

Open your App.xaml and add the following string constant to it

<Application
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="SampleSilverlight.App"
xmlns:clr="clr-namespace:System;assembly=mscorlib">
<
Application.Resources>
<
clr:String x:Key="DC">DevCurry</clr:String>
</
Application.Resources>
</
Application>



We will access this string constant programmatically using C# or VB.NET. 
Open your Page.xaml and add a TextBlock and a Button to it.
<StackPanel Height="200" Width="200">
<
TextBlock x:Name="tb"></TextBlock>
<
Button x:Name="btnFetch" Content="Fetch"
Click="btnFetch_Click"></Button>
</
StackPanel>
Now add the following code on button click:
C# 
private void btnFetch_Click(object sender, RoutedEventArgs e)
{
if (Application.Current.Resources.Contains("DC"))
{
tb.Text = (string)Application.Current.Resources["DC"];
}
}
VB.NET
Private Sub btnFetch_Click(ByVal sen As Object, ByVal e As RoutedEventArgs)
If Application.Current.Resources.Contains("DC") Then
tb.Text = CStr(Application.Current.Resources("DC"))
End If
End Sub

The Application.Resources gets a collection of Application-Scoped resources.

On clicking the button, the text ‘DevCurry’ gets displayed


image



Will you give this article a +1 ? Thanks in advance


About The Author

Suprotim Agarwal
Suprotim Agarwal, ASP.NET Architecture MVP (Microsoft Most Valuable Professional) works as an Architect Consultant and provides consultancy on how to design and develop Web applications.

Suprotim is also the founder and primary contributor to DevCurry, DotNetCurry and SQLServerCurry. He is the Editor of a Developer Magazine called DNC Magazine. He has also written two EBooks 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook

Follow him on twitter @suprotimagarwal

1 comment:

Danish Sami said...

Thanks man, I was getting crazy and dont know whatever to know how to read the XAML contents and when I saw your post, I said "May GOD (Allah) gives you long life.

BIG THANKS.

-Danish Sami.