在代码后面创建样式触发器，只有 2 个设置器之一正在工作

Question

BorderThicknessProperty 已正确应用，但 ForeGroundProperty 未正确应用。我尝试过交换二传手的位置，认为可能只有第一个被应用。我尝试了其他几个属性，除了 BorderThickness 之外，没有一个可以工作。我猜我需要访问内容的文本块，但我不知道如何做到这一点。

var foregroundSetter = new Setter()
{
 Property = Button.ForegroundProperty,
 Value = Brushes.LightGray
};

var borderThicknessSetter = new Setter()
{
 Property = Button.BorderThicknessProperty,
 Value = new Thickness(0)
};

var isEnabledTrigger = new Trigger()
{
 Property = Button.IsEnabledProperty,
 Value = false
 //Setters = { foregroundSetter, borderThicknessSetter }
};
isEnabledTrigger.Setters.Add(foregroundSetter);
isEnabledTrigger.Setters.Add(borderThicknessSetter);

var style = new Style();
style.Triggers.Add(isEnabledTrigger);

var pdfButton = new Button()
{
 Padding = new Thickness(0, 0, 0, 0),
 Margin = new Thickness(0, 0, 5, 0),
 Height = 18,
 Width = 20,
 Content = "PDF",
 FontSize = 9,
 FontWeight = FontWeights.SemiBold,
 Foreground = Brushes.Red,
 BorderBrush = Brushes.Transparent,
 Background = Brushes.Transparent,
 ToolTip = new ToolTip() { Content = "Create PDF of training day." },
 Command = CreatePdfCommand,
 CommandParameter = newTab,
 Style = style
};

Answer 1

您为 Foreground 属性分配了本地值 (

Foreground = Brushes.Red

)。之后，可能会触发样式触发器，但触发器中的前景 setter 将被忽略，因为本地值具有更大的权重（称为 依赖属性值优先级）

要修复该行为，请通过样式设置器设置正常的前景值：

var foregroundNormalSetter = new Setter()
{
 Property = Button.ForegroundProperty,
 Value = Brushes.Red
};

var foregroundSetter = new Setter()
{
 Property = Button.ForegroundProperty,
 Value = Brushes.LightGray
};

var borderThicknessSetter = new Setter()
{
 Property = Button.BorderThicknessProperty,
 Value = new Thickness(0)
};

var isEnabledTrigger = new Trigger()
{
 Property = Button.IsEnabledProperty,
 Value = false
 //Setters = { foregroundSetter, borderThicknessSetter }
};
isEnabledTrigger.Setters.Add(foregroundSetter);
isEnabledTrigger.Setters.Add(borderThicknessSetter);

var style = new Style();
style.Setters.Add(foregroundNormalSetter);
style.Triggers.Add(isEnabledTrigger);

var pdfButton = new Button()
{
 Padding = new Thickness(0, 0, 0, 0),
 Margin = new Thickness(0, 0, 5, 0),
 Height = 18,
 Width = 20,
 Content = "PDF",
 FontSize = 9,
 FontWeight = FontWeights.SemiBold,
 //Foreground = Brushes.Red,
 BorderBrush = Brushes.Transparent,
 Background = Brushes.Transparent,
 ToolTip = new ToolTip() { Content = "Create PDF of training day." },
 Command = CreatePdfCommand,
 CommandParameter = newTab,
 Style = style
};