Performance when loading list elements

Question

I have about one hundred entries in a list. These are of data type DataA. A single entry within this list is of the data type DataB. DataB is derived from DataA. During debugging, I see in the output window that for all list elements of the data type DataA, all properties for the data type DataB are queried, although the grid, whose elements access the properties of DataB, is hidden. Although I can understand that it is necessary to query these properties and update the GUI elements with the values from DataB, I do not need to update the GUI elements if the grid surrounding them is hidden.

I used the StopWatch to measure the time it takes from the output of the constructor of the MainWindow to the call of Window_Loaded() and found that with the additional grid (for Player Controls) 30 to 40 percent more time is needed.

Is there a way to improve the performance?

public class DataA

{

// ...

public virtual Visibility => Visibility.Collapsed;

}

public class DataB : DataA // only for Player Controls

{

// ...

public override Visibility => Visibility.Visible;

}

<ItemsControl>

<ItemsControl.ItemTemplate>

<DataTemplate>

<Grid>

<TextBlock Foreground="{Binding ...}" Text="{Binding ...}" />

<TextBlock Foreground="{Binding ...}" Text="{Binding ...}" />

<TextBlock Foreground="{Binding ...}" Text="{Binding ...}" />

<TextBlock Foreground="{Binding ...}" Text="{Binding ...}" />

<!--...-->

<!--Player Controls-->

<Grid Visibility="{Binding PlayerVisibility}">

<TextBlock Text="{Binding ...}" />

<TextBlock Text="{Binding ...}" />

<TextBlock Text="{Binding ...}" />

<TextBlock Text="{Binding ...}" />

<Grid>

<Border BorderBrush="{Binding ...}">

<StackPanel>

<TextBlock Foreground="{Binding ...}" Text="{Binding ...}" />

<TextBlock Foreground="{Binding ...}" Text="{Binding ...}" />

<TextBlock Foreground="{Binding ...}" Text="{Binding ...}" />

</StackPanel>

</Border>

<!--...-->

</Grid>

</Grid>

</Grid>

</DataTemplate>

</ItemsControl.ItemTemplate>

</ItemsControl>

Answer 1

Hi,@Heiko. Welcome to Microsoft Q&A. 

You could optimize the performance of loading List elements from the following perspectives.

 

1.Control virtualization. You could refer to the following document to virtualize your controls:

https://learn.microsoft.com/en-us/dotnet/desktop/wpf/advanced/optimizing-performance-controls?view=netframeworkdesktop-4.8.

2.Set not only Visibility but also IsEnabled for Player Controls.

 

3.Page loading. Try to reduce the amount of data loaded at one time to improve performance.

 

4.Simplify styles and templates. Complex styles and templates will increase rendering time, try to simplify them.

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