我想封装一个方法简便一下代码，大概内容是鼠标移动到按钮会在Image中加上图片以，如果按钮是已经点击过的，鼠标移动过去不会发变改mIage状态。
private static bool picregisterFlag;
private static bool picuserAdministrationFlag;
private void pictureBox1_Click_1(object sender, EventArgs e)
{
this.tabControl1.SelectedIndex = 0;

        picregisterFlag=true;
        picuserAdministrationFlag = false;

        picregister.BackgroundImage = Resources.用户注册选中;
        picuserAdministration.BackgroundImage = Resources.用户管理;
    }
    private void pictureBox2_Click(object sender, EventArgs e)
    {
        this.tabControl1.SelectedIndex = 1;

        picregisterFlag = false;
        picuserAdministrationFlag = true;

        picregister.BackgroundImage = Resources.用户注册;
        picuserAdministration.BackgroundImage = Resources.用户管理选中;
    }

                    private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
    {
        if (picregisterFlag == true) { picregister.Image = null; }
        else { picregister.Image = Resources.导航鼠标经过; }
    }

                    private void pictureBox2_MouseMove(object sender, MouseEventArgs e)
    {
        if (picuserAdministrationFlag == true) { picuserAdministration.Image = null; }
        else { picuserAdministration.Image = Resources.导航鼠标经过; }
    }

和 https://ask.csdn.net/questions/714732 一样的问题，如果问题得到解决，请点我回答左上角的采纳和向上的箭头，谢谢