internal DialogButtonViewModel(DialogButtons button, MessageDialogViewModel dlvm)
{
Caption = button.ToString();
Command = new SimpleCommand()
{
ExecuteDelegate =
(obj) =>
{
dlvm.SelectedButton = button;
}
};
}
async public Task <DialogResult> ShowAsync(string message, string title, DialogButtons buttons)
{
if (string.IsNullOrEmpty(message))
{
throw new ArgumentException(
"The specified message cannot be null or empty.", "message");
}
if (string.IsNullOrEmpty(title))
{
throw new ArgumentException(
"The specified title cannot be null or empty.", "title");
}
MessageDialog dialog = new MessageDialog(message, title);
DialogResult result = DialogResult.None;
switch (buttons)
{
case DialogButtons.OK:
{
dialog.Commands.Add(
new UICommand("OK", new UICommandInvokedHandler(
o => result = DialogResult.OK)));
break;
}
case DialogButtons.OKCancel:
{
dialog.Commands.Add(new UICommand("OK",
new UICommandInvokedHandler(o => result = DialogResult.OK)));
dialog.Commands.Add(new UICommand("Cancel",
new UICommandInvokedHandler(o => result = DialogResult.Cancel)));
break;
}
case DialogButtons.YesNo:
{
dialog.Commands.Add(new UICommand("Yes",
new UICommandInvokedHandler(o => result = DialogResult.Yes)));
dialog.Commands.Add(new UICommand("No",
new UICommandInvokedHandler(o => result = DialogResult.No)));
break;
}
default:
{
throw new NotSupportedException(
string.Format("DialogButtons.{0} is not supported.",
buttons.ToString()));
}
}
dialog.DefaultCommandIndex = 1;
// Determine whether the calling thread is the
// thread associated with the Dispatcher.
if (Window.Current.Dispatcher.HasThreadAccess)
{
await dialog.ShowAsync();
}
else
{
// Execute asynchronously on the thread the Dispatcher is associated with.
await Window.Current.Dispatcher.RunAsync(
CoreDispatcherPriority.Normal, async() =>
{
await dialog.ShowAsync();
});
}
return(result);
}