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//页面1:
public string lablestring
{
get { return this.labelstr1.Content.ToString(); }
set {this.labelstr1.Content=value;}
}
//页面2:
private void button1_Click(object sender, RoutedEventArgs e)
{
MainWindow mw = (MainWindow)this.Owner;
mw.lablestring= "1234456";
this.Close();
}