wpf - 绑定(bind)源 vs x :Static

Question

在 WPF 中，可以绑定(bind)到静态属性。现在我知道了两种方法:

Content="{x:Static stat:Statics.CurrentUser}"

或者:

Content="{Binding Source={x:Static stat:Statics.CurrentUser}}"

这两种方法有什么区别吗？

Answer 1

这种情况下的主要区别在于 x:Static不执行额外的转换

来自 x:Static Markup Extension

Use caution when you make x:Static references that are not directly the type of a property's value. In the XAML processing sequence, provided values from a markup extension do not invoke additional value conversion. This is true even if your x:Static reference creates a text string, and a value conversion for attribute values based on text string typically occurs either for that specific member or for any member values of the return type.

所以让我们说你做

<TextBlock Text="{x:Static SystemColors.ActiveBorderBrush}"/>

这将导致运行时错误:

'#FFB4B4B4' is not a valid value for property 'Text'.

因为 SolidColorBrush不是 String同时

<TextBlock Text="{Binding Source={x:Static SystemColors.ActiveBorderBrush}}"/>

可以正常工作并显示#FFB4B4B4，因为它将执行 ToString()转换。也没有 Binding您无法访问静态对象的实例属性，例如您将无法获得 Color那把刷子的属性

<TextBlock Text="{Binding Source={x:Static SystemColors.ActiveBorderBrush}, Path=Color}"/>