我需要从App.xaml.cs
类获得一个非静态字段,但我不知道如何。
这是我的代码从App.xaml.cs
包含IsUserLoggedIn
字段:
public partial class App : Application
{
internal bool IsUserLoggedIn { get; private set; }
}
,这是代码调用EventTable.cs
类的IsUserLoggedIn
字段:
internal class EventTable
{
private void UpdateEvents()
{
if (App.Current.IsUserLoggedIn) // here is an error: "Applcation"
{ // does not contain the definition
// of "IsUserLoggedIn"
}
}
}
App.Current
是与Application.Current
相同的静态属性,并且声明了Application
类型。您需要将其强制转换为App
。我建议这样做:
public partial class App : Application
{
internal bool IsUserLoggedIn { get; private set; }
public static App Instance
{
get { return Current as App; }
}
}
则在condition中使用:
internal class EventTable
{
private void UpdateEvents()
{
if (App.Instance.IsUserLoggedIn)
{
}
}
}