我在VS2017中启动的项目无法在VS2019上构建：错误CS1061

Question

project I started in visual studio 2017 gets this error when I try to run it in visual studio 2019 :

Error CS1061 'SimpleViewWindow' does not contain a definition for 'ConnectRDP_Clicked' and no accessible extension method 'ConnectRDP_Clicked' accepting a first argument of type 'SimpleViewWindow' could be found (are you missing a using directive or an assembly reference?) VPN_Switch C:\\Users\\Tommy\\source\\repos\\Soft VPN\\VPN_Switch\\Windows\\SimpleViewWindow.xaml

this error occurs on about 11 other buttons as well.

I have checked that if I add a new event for the buttons that have this error, it does add the new event handler to the mainwindow.xaml.cs as it should.

I have also tried to rebuild as other solutions suggested.

XAML

<MenuItem Header="File">
                        <MenuItem Header="{Binding Path=ButtonClickAction}" Click="Connect_Clicked" />
                        <MenuItem Header="Connect to PC" Click="ConnectRDP_Clicked" />
                        <MenuItem Header="Edit" Click="EditVPN_Clicked" />
                        <Separator />
                        <MenuItem Header="New"   Click="NewEntry_Clicked" />
                        <MenuItem Header="Import" Foreground="#FF999999" />
                        <Separator />
                        <MenuItem Header="Create Shortcut" Foreground="#FF999999" />
                        <Separator />
                        <MenuItem Header="Delete" Click="Remove_Clicked" />                        
                        <Separator />
                        <MenuItem Header="Exit" Click="Exit_Clicked" />
                    </MenuItem>

C#

private void Connect_Clicked(object sender, RoutedEventArgs e)
{
    if (dg_DataGrid.SelectedItem != null)
    {
        ConnectionHandeler((VPN)dg_DataGrid.SelectedItem);
    }
}

private void ConnectRDP_Clicked(object sender, RoutedEventArgs e)
{
      ConnectRDP();
}

private void EditVPN_Clicked(object sender, RoutedEventArgs e)
{
      EditVPNWindow E_Window = new EditVPNWindow();
      E_Window.Show();
}

private void NewEntry_Clicked(object sender, RoutedEventArgs e)
{
     AddVPNWindow window = new AddVPNWindow();
     window.Show();
}

when running the program on VS 2017 it works as it should, so I expect it to be some problem with visual studio 2019 , some path that isn't correct or something like that.

Answer 1

Please try changing private void ConnectRDP_Clicked to protected void ConnectRDP_Clicked . You may do this for all similar event handlers.

Answer 2

Solved the problem on my own. was a simple case of temporary blindness. the problem was that i have the same toolbar on another window and that window did not have the methods for the buttons like it had in mainwindow. Sorry for wasting peoples time :)