C# winforms 'Control' does not contain a definition for 'BorderStyle'-CodePudding

I'm creating a winforms app using VS 2022 and getting the above error.
Checking MSDN there is no Control property called BorderStyle. Instead BorderStyle documentation is found under Windows Desktop 6.

This is my code:

using System.Drawing;
using System.Windows.Forms;

namespace BURS_Library
{
    public class Styles : Form
    {
        public static void LBLasBTN_Enable(Control ctrlName)
        {
            ctrlName.BackColor = Color.FromArgb(214, 206, 165);
            ctrlName.ForeColor = Color.FromArgb(0, 0, 0);
            ctrlName.BorderStyle = BorderStyle.FixedSingle;
            ctrlName.Font = new Font("Segoe UI", 8, FontStyle.Bold);
            ctrlName.Enabled = true;
            ctrlName.Cursor = Cursors.Hand;
        }

All of the other properties are compiling. Looking in the Designer file I find "controlName".BorderStyle = etc so I was surprised when this didn't work. What should I be using instead of Control?
Thank you.

CodePudding user response：

A WinForm Control is just a common base class for all WinForm controls: read the docs. Not all WinForm controls have a border/border style.

There are a couple of options if you want to set the border style with a generic method.

Reflection

Using reflection is basically a catch-all here and will only set the border style if a border style property exists:

public static void LBLasBTN_Enable( Control ctrl )
{
    ctrl.BackColor = Color.FromArgb( 214, 206, 165 );
    ctrl.ForeColor = Color.FromArgb( 0, 0, 0 );
    ctrl.Font = new Font( "Segoe UI", 8, FontStyle.Bold );
    ctrl.Enabled = true;
    ctrl.Cursor = Cursors.Hand;

    PropertyInfo pi = ctrl.GetType().GetProperty( "BorderStyle", BindingFlags.Public | BindingFlags.Instance );
    if( pi != null )
    {
        pi.SetValue( ctrl, BorderStyle.FixedSingle );
    }
}

Casting

Alternatively, the control can be cast into whatever type you expect to have a border style:

public static void LBLasBTN_Enable( Control ctrl )
{
    ctrl.BackColor = Color.FromArgb( 214, 206, 165 );
    ctrl.ForeColor = Color.FromArgb( 0, 0, 0 );
    ctrl.Font = new Font( "Segoe UI", 8, FontStyle.Bold );
    ctrl.Enabled = true;
    ctrl.Cursor = Cursors.Hand;

    if( ctrl is Label lbl )
    {
        lbl.BorderStyle = BorderStyle.FixedSingle;
    }

    // add other types as needed...
}

Personally I'm a bit lazy and would just go the reflection route. However, if you want to be fully explicit, then go the casting route.