要修改VC模式对话框控件属性，必然，最重要的是弄清楚对话框上的控件在何时创建，要在保证创建之后才修改，在网上找到一些资料，提出了修改对话框类的构造函数的方法，但是经测试，不能完成。后来把
m_ListSet.AddString("属性");
放到对话框类的 OnInitDialog()函数中，响应WM_INITDIALOG消息，顺利执行！
具体原因等毕业设计做完之后去研究。
当DoModal被调用后，实际在幕后引起一系列如下的动作：
CDialog::DoModal->CEx06Dialog::OnInitDialog->其它的初始化->CDialog::OnInitDialog->CWnd::UpdateData(FALSE)->CEx06Dialog::DoDataExchange
用户输入数据…
用户单击OK按钮
CEx06Dialog::OnOk->…其它的确认处理…->CDialog::OnOk->CWnd::UpDateData(TURE)->CEx06Dialog::DoDataExchange->CDialog::EndDialog(IDOK)
说明：
1）virtual BOOL OnInitDialog( );
//CDialog::OnInitDialog This member function is called in response to the WM_INITDIALOG message. This message is sent to the dialog box during the Create, CreateIndirect, or DoModal calls, which occur immediately before the dialog box is displayed.
//Override this member function if you need to perform special processing when the dialog box is initialized.
2）BOOL UpdateData( BOOL bSaveAndValidate = TRUE );
//CWnd::UpdateData ：Call this member function to initialize data in a dialog box, or to retrieve and validate dialog data.
//bSaveAndValidate：Flag that indicates whether dialog box is being initialized (FALSE) or data is being retrieved (TRUE).
//By default UpdateData(TRUE) is called in the default CDialog::OnOK handler and UpdateData(FALSE) is called in the default CDialog::OnInitDialog.
3）virtual void DoDataExchange( CDataExchange* pDX );
//CWnd::DoDataExchange Called by the framework to exchange and validate dialog data.
//Never call this function （DoDataExchange） directly. It is called by the UpdateData member function.
//Call UpdateData to initialize a dialog box’s controls or retrieve data from a dialog box.
4）void EndDialog( int nResult );
//CDialog::EndDialog makes the dialog box invisible but does not destroy it.
//Call this member function to terminate a modal dialog box. This member function returns nResu
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