反射实现 WPF 按钮的  PerformClick：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls.Primitives;
namespace cmbc
{
    static public class  ButtonEx
    {
        public static void PerformClick(this ButtonBase button)
        {
            var method = button.GetType().GetMethod("OnClick",
                BindingFlags.NonPublic | BindingFlags.Instance);
            if (method != null)
            {
                method.Invoke(button, null);
            }
            //button.Focus();
        }
    }
}