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public class ClassB
{
public Form ShowFormA()
{
FormA formA = new FormA();
return formA;
}
}
private void 显示窗体A_Click(object sender, EventArgs e)
{
WindowsFormsApplication3.ClassB classB = new WindowsFormsApplication3.ClassB();
Form formA = classB.ShowFormA();
formA.MdiParent = this;
formA.Show();
}