为什么CheckBox.IsChecked属性为Nullable< bool> ;? [英] Why is CheckBox.IsChecked property Nullable<bool>?
问题描述
这看起来像一个有趣的问题 -
为什么是复选框控件的 IsChecked
WPF的类型 bool?
(或 Nullable< bool>
),我的意思是如何一个复选框控件的值'null'? /library/system.windows.controls.primitives.togglebutton.ischecked.aspxrel =nofollow noreferrer>文档, IsChecked
属性有三种不同的可能状态:
因此,当 IsChecked
设置为 null
时,将显示不确定状态。这通常表示为阴影或灰色的控件。
This seems to me like a funny question -
Why is the IsChecked
property of a checkbox control in WPF of type bool?
(or Nullable<bool>
), I mean how can a checkbox control have the value of 'null' ?
According to the documentation, the IsChecked
property has three different possible states:
So, when IsChecked
is set to null
, the check box will show an "indeterminate" state. This is commonly represented as a shaded, or greyed-out, control.
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