app.xaml.cs 中的依赖属性
我是 WPF 新手，下面的问题对很多人来说可能看起来很愚蠢，请原谅我。
如何在 app.xaml.cs 中创建依赖属性？
事实上，我尝试创建它。下面的代码
public static DependencyProperty TempProperty =
DependencyProperty.Register("Temp", typeof(string), typeof(App));
public string Temp
{
get { return (string)GetValue(TempProperty); }
set { SetValue(TempProperty, value); }
}
抛出以下编译时错误：
当前上下文中不存在名称“GetValue”
当前上下文中不存在名称“SetValue”
有人可以帮助我吗？
谢谢你！
I am new to WPF and the below question may look silly for many, please pardon me.
How can I create a dependency property in app.xaml.cs?
Actually, I tried to created it. The below code,
public static DependencyProperty TempProperty =
DependencyProperty.Register("Temp", typeof(string), typeof(App));
public string Temp
{
get { return (string)GetValue(TempProperty); }
set { SetValue(TempProperty, value); }
}
throws the below compile time errors:
The name 'GetValue' does not exist in the current context
The name 'SetValue' does not exist in the current context
Can anybody help me in this?
Thank you!
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DependencyProperties 只能在 DependencyObjects 上创建，并且由于 Application（您的 App 类继承自）没有实现它，因此您无法直接在 App 类上创建 DependencyProperty。
我假设您希望此属性支持绑定。如果是这种情况，您有两个选择：
即，如果您的新属性称为 Properties，您可以像这样绑定：
如果该属性需要成为 Binding 的目标，那么选项 #2 是您最好的选择。
DependencyProperties can only be created on DependencyObjects, and since Application (which your App class inherits from) doesn't implement it, you can't create a DependencyProperty directly on the App class.
I assume you want this property to support binding. If this is the case, you have two options:
i.e if your new property is called Properties, you can bind like so:
If the property needs to be the target of a Binding, then option #2 is your best bet.
包含依赖属性的类必须继承自 DependencyObject。
You class that contains dependency properties must inherit from DependencyObject.