2.4.1主界面的功能系统结构图对应

主界面的功能系统结构图对应.PNG

登录成功.PNG

收银员界面.PNG

库管员界面.PNG

2.4.5 重要代码片段

    private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
    {
        FormChild frmChild = new FormChild();
        frmChild.MdiParent = this;
        frmChild.Show();
        // 试一试frmChild.ShowDialog()看看什么效果
    }

private void QueryProtoolStripMenuItem_Click(object sender, EventArgs e)
{
QueryProForm queryForm = new QueryProForm();
queryForm.MdiParent = this;
queryForm.Show();
}
    private void MainForm_Load(object sender, EventArgs e)
    {
        datetoolStripStatusLabel.Text = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
        usertoolStripStatusLabel.Text = userName;
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        datetoolStripStatusLabel.Text = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
    }