CODEWITHSUNDEEP
c#wpftriggersstylesdatatemplate
user3685285
user3685285

Reputation: 6586

C# WPF - Style Triggers not working in code behind

I am trying to add triggers to a WPF DataTemplate, which I will use as a cell template in my DataGrid. I need to do this programatically, so it is all in the code behind. I want the border to be highlighted when you mouse over it, but it doesn't seem to work.

DataTemplate dt = new DataTemplate();

// other implementation

Trigger t1 = new Trigger() { Property = IsMouseOverProperty, Value = true };
t1.Setters.Add(new Setter(BorderBrushProperty, System.Windows.Media.Brushes.Black));
t1.Setters.Add(new Setter(BorderThicknessProperty, new Thickness(4.0)));
dt.Triggers.Add(t1);

// add to visual tree, and other logic that works perfectly.

The only thing that doesn't work is this trigger. It doesn't highlight the border when I mouse over the cells. What's wrong?

Upvotes: 1

Views: 3458

Answers (1)

Clemens
Clemens

Reputation: 128061

You have to specify the elements that the Trigger and the Setters are operating on.

Set the SourceName property of the Trigger and the TargetName of the Setters:

var dt = new DataTemplate();

var t1 = new Trigger()
{
    SourceName = "source",
    Property = IsMouseOverProperty,
    Value = true
};

t1.Setters.Add(new Setter(BorderBrushProperty, Brushes.Black, "target"));
t1.Setters.Add(new Setter(BorderThicknessProperty, new Thickness(4.0), "target"));
dt.Triggers.Add(t1);

Upvotes: 3

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