using System.Text;

namespace WinFormsApp1
{
    public partial class Form1 : Form
    {
        private readonly A _a;
        private readonly A.GetLogString _c1Log;
        private readonly A.GetLogString _c2Log;
        private readonly A.GetLogString _fullLog;

        public Form1()
        {
            InitializeComponent();

            _a = new A();

            _c1Log = _a.AddALog;
            _c2Log = _a.AddBLogString;
            _fullLog = _c1Log + _c2Log; // объединение
        }

        private void PrintC1Btn_Click(object sender, EventArgs e)
        {
            var c1 = _a.C1;

            var logContainer = new StringBuilder();
            _c1Log(nameof(_a.C1), logContainer);

            InfoListBox.Items.Add(logContainer.ToString());
        }

        private void PrintC2Btn_Click(object sender, EventArgs e)
        {
            var c2 = _a.C2;

            var logContainer = new StringBuilder();
            _c2Log(nameof(_a.C2), logContainer);

            InfoListBox.Items.Add(logContainer.ToString());
        }

        private void PrintFullLogBtn_Click(object sender, EventArgs e)
        {
            var c1 = _a.C1;
            var c2 = _a.C2;

            var logContainer = new StringBuilder();
            _fullLog($"{nameof(_a.C1)},{nameof(_a.C2)}", logContainer);

            InfoListBox.Items.Add(logContainer.ToString());
        }
    }
}