c# - 如何在 WPF 中保存全局应用程序变量？

Question

在 WPF 中，我可以在一个 UserControl 中保存值，然后在另一个 UserControl 中再次访问该值，类似于网络编程中的 session 状态，例如:

UserControl1.xaml.cs:

Customer customer = new Customer(12334);
ApplicationState.SetValue("currentCustomer", customer); //PSEUDO-CODE

UserControl2.xaml.cs:

Customer customer = ApplicationState.GetValue("currentCustomer") as Customer; //PSEUDO-CODE

回答:

谢谢，鲍勃，这是我根据你的代码开始工作的代码:

public static class ApplicationState
{
    private static Dictionary<string, object> _values =
               new Dictionary<string, object>();
    public static void SetValue(string key, object value)
    {
        if (_values.ContainsKey(key))
        {
            _values.Remove(key);
        }
        _values.Add(key, value);
    }
    public static T GetValue<T>(string key)
    {
        if (_values.ContainsKey(key))
        {
            return (T)_values[key];
        }
        else
        {
            return default(T);
        }
    }
}

保存一个变量:

ApplicationState.SetValue("currentCustomerName", "Jim Smith");

读取一个变量:

MainText.Text = ApplicationState.GetValue<string>("currentCustomerName");

Answer 1

The Application class已经内置了此功能。

// Set an application-scope resource
Application.Current.Resources["ApplicationScopeResource"] = Brushes.White;
...
// Get an application-scope resource
Brush whiteBrush = (Brush)Application.Current.Resources["ApplicationScopeResource"];