在C#中获取Focused元素的名称

Question

C#中是否有一个函数可以返回聚焦元素的名称并将其显示在文本框中？

Answer 1

或者你可以做这样的事......

  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Linq;
  using System.Text;
  using System.Windows.Forms;
  using System.Runtime.InteropServices;

namespace WindowsFormsApplication1
{
   public partial class Form1 : Form
   {
       public Form1()
       {
            InitializeComponent();            
       }

      private void button1_Click(object sender, EventArgs e)
      {

        MessageBox.Show(GetFocusControl());
      }

      [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Winapi)]
      internal static extern IntPtr GetFocus();

      private string GetFocusControl()
      {
        Control focusControl = null;
        IntPtr focusHandle = GetFocus();
        if (focusHandle != IntPtr.Zero)
            focusControl = Control.FromHandle(focusHandle);
        if (focusControl.Name.ToString().Length == 0)
            return focusControl.Parent.Parent.Name.ToString();
        else
            return focusControl.Name.ToString();
      }
   }
 }