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,例如Web编程中的会话状态,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,Bob,这是我开始工作的代码,基于你的代码:

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);
        }
    }
}

要保存变量:

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

要读取变量:

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

Answer 1

Application类已经内置了此功能.

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

Answer 2

这样的事情应该有效.

public static class ApplicationState 
{ 
    private static Dictionary<string, object> _values =
               new Dictionary<string, object>();

    public static void SetValue(string key, object value) 
    {
        _values.Add(key, value);
    }

    public static T GetValue<T>(string key) 
    {
        return (T)_values[key];
    }
}