CODEWITHSUNDEEP
c#.netwpfwindow
Daniel Peñalba
Daniel Peñalba

Reputation: 31857

How to detect the first show of a WPF Window?

I was wondering which is the correct way to detect when a WPF windows has been shown for the first time?

Upvotes: 8

Views: 12905

Answers (3)

Jeong Minu
Jeong Minu

Reputation: 45

Loaded can be called more than once.

The Loaded event and the Initialized event

According to my test and the link above, Loaded event can be fired more than once.
So, you need to set a flag in the OnLoaded handler.

For example, if Stack Panel is inside TabItem control, loaded will be called every time you step into tab.

Upvotes: 3

bash.d
bash.d

Reputation: 13207

There is an event called Loaded that you can use to determine when your window is ready.

From MSDN

Occurs when the element is laid out, rendered, and ready for interaction.

set the handler in XAML

<StackPanel
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="SDKSample.FELoaded"
Loaded="OnLoad"
Name="root">
</StackPanel>

add the code-behind

void OnLoad(object sender, RoutedEventArgs e)
{
    Button b1 = new Button();
    b1.Content = "New Button";
    root.Children.Add(b1);
    b1.Height = 25;
    b1.Width = 200;
    b1.HorizontalAlignment = HorizontalAlignment.Left;
}

Upvotes: 9

Postback
Postback

Reputation: 639

i would suggest to make a bool flag and check it, and in the constructor set it to true

bool FirstTime = true;

void OnLoad(object sender, RoutedEventArgs e)
{
     if (FirstTime)
     {
          FirstTime = false;
          //do your stuff first-time
     }
     else
     {
           //do your stuff for other
     }
}

Upvotes: -1

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