如何在Windows Phone 8上的异步方法中使用Messagebox.Show？

Question

在MessageBox上生成异常。如何在MessageBox方法中使用async？

private async void Purchheard(object sender,EventArgs e)
{
    Debug.WriteLine("Начинаю покупку");
    try
    {
        await CurrentApp.RequestProductPurchaseAsync(ID,false);
        if(license.ProductLicenses[ID].IsActive)
        {
            world.is_freemium=false;
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show("Finished!");
    }
}

Answer 1

不确定为什么接受的答案不起作用，但这是.NET 4.5的一个工作示例

var dg = new Action(() => { MessageBox.Show(msg, name); });
Dispatcher.CurrentDispatcher.BeginInvoke(dg);

Anonymous methods and delegates

CS0120: An object reference is required for the nonstatic field, method, or property 'foo'

Answer 2

Dispatcher.BeginInvoke(delegate() { MessageBox.Show("your stuff"); });