锁屏功能

[c#]代码库

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Common;

namespace Pos
{
    public partial class frmLockScreen : Form
    {
        public frmLockScreen()
        {
            InitializeComponent();
        }

        private void txtPass_KeyDown(object sender, KeyEventArgs e)
        {
            
            if (e.KeyCode == Keys.Enter)
            {
                if (txtPass.Text == PUser.UserPass)
                {
                    this.Close();
                }
                else
                {
                    lblErr.Visible = true;
                }
            }
        }

        private void txtPass_TextChanged(object sender, EventArgs e)
        {
            lblErr.Visible = false;

        }

        private void tmrLock_Tick(object sender, EventArgs e)
        {
            if (lblDisp.ForeColor == Color.Blue)
            {
                lblDisp.ForeColor = Color.Red;
            }
            else
            {
                lblDisp.ForeColor = Color.Blue;
            }
        }

        private void frmLockScreen_KeyDown(object sender, KeyEventArgs e)
        {

        }
    }
}

[代码运行效果截图]