Trigger, Datatrigger - what's the difference?

Question

Hi ,
my goal is select the first row inside the Datagrid.
Works well with MoveCurrentToFirst.

Only if the control get the focus is it blue.
Is there a way to control it from the code?
And if the focus is the DataGrid, the default color is blue. How could I change this to light green?
You said triggers, yes, but where?

I can set a trigger for each control.
Is that right?

But I can also do it globally for each button. Is that right?

Where is the different? DataTrigger Binding="{Binding ElementName=txtScanMagazine,
Trigger Property="PropertyToCheck" Value="CheckValue">

PropertyToCheck is my own function?
Value is the return value?

Answer 1

Add the below code for your DataGrid:

    <DataGrid.Resources>  
                    <SolidColorBrush x:Key="columnBackground"/>  
    </DataGrid.Resources>  

Then set the CellStyle for the DataGrid:

Change the color in the cs:

this.dg.Resources["columnBackground"] = Brushes.Red;

The result is like below shown:

Here is the demo code for you to test.

Answer 2

You need to set trigger under the Style/Style.Triggers.Such as the using of Triggers:

There are several different types of triggers: Trigger, MultiTrigger, EventTrigger, DataTrigger, and MultiDataTrigger. In the document , you can see the examples of how to use Trigger and EventTrigger.