C＃WPF - 样式触发器不工作在代码背后

Question

我想添加触发器到WPF DataTemplate，我将用作我的DataGrid中的单元格模板。我需要以编程方式执行此操作，所以它都在代码背后。我想让鼠标悬停时突出显示边框，但似乎不起作用。

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. 

唯一不起作用的是这个触发器。当我将鼠标悬停在单元格上时，它不会突出显示边框。怎么了？

Answer 1

您必须指定Trigger和Setters运行的元素。

设置触发的SourceName财产和二传手的TargetName：

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);