how-to-call-properties-and-methods-of-the-windows-forms-control.md

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Learn more about: How to: Call Properties and Methods of the Windows Forms Control	How to: Call Properties and Methods of the Windows Forms Control	get-started-article	11/04/2016	method calls, Windows Forms calling methods, Windows Forms control calling properties, Windows Forms control Windows Forms controls [C++], methods calling properties Windows Forms controls [C++], properties	6e647d8a-fdaa-4aa1-b3fe-04f15cff8eb3

How to: Call Properties and Methods of the Windows Forms Control

Because CWinFormsView::GetControl returns a pointer to xref:System.Windows.Forms.Control?displayProperty=fullName, and not a pointer to WindowsControlLibrary1::UserControl1, it is advisable to add a member of the user control type and initialize it in IView::OnInitialUpdate. Now you can call methods and properties using m_ViewControl.

This topic assumes you have previously completed How to: Create the User Control and Host in a Dialog Box and How to: Create the User Control and Host MDI View.

To create the MFC host application

1. Open the MFC application you created in How to: Create the User Control and Host MDI View.

2. Add the following line to the public overrides section of the CMFC02View class declaration in MFC02View.h.

   gcroot<WindowsFormsControlLibrary1::UserControl1 ^> m_ViewControl;

3. Add an override for OnInitialupdate.

   Display the Properties window (F4). In Class View (CTRL+SHIFT+C), select CMFC02View class. In the Properties window, select the icon for Overrides. Scoll down the list to OnInitialUpdate. Click on the drop down list and select <Add>. In MFC02View.cpp. make sure the body of the OnInitialUpdate function is as follows:

   CWinFormsView::OnInitialUpdate();
   m_ViewControl = safe_cast<WindowsFormsControlLibrary1::UserControl1 ^>(this->GetControl());
   m_ViewControl->textBox1->Text = gcnew System::String("hi");
   

4. Build and run the project.

   On the Build menu, click Build Solution.

   On the Debug menu, click Start without debugging.

   Notice that the text box is now initialized.

See also

Hosting a Windows Forms User Control as an MFC View