再问一个简单问题,为啥函数总是执行两次?
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
ComboBoxEx1->Items->Add("vc");
ComboBoxEx1->Items->Add("bcb");
ComboBoxEx1->Text = "abc";
}
//---------------------------------------------------------------------------
void __fastcall TForm1::ComboBoxEx1Change(TObject *Sender)
{
ShowMessage(ComboBoxEx1->Text);
}
//---------------------------------------------------------------------------
我想就凭这些大家已经知道我的整个测试代码了.
我切换时,ShowMessage总是连续执行两次,为何?有什么办法让它只执行一次?