机房收费系统遇到的问题(三) 那些细节

    1.timer控件默认Enabled属性为False

    上机界面的"消费时间"雷打不动，我一遍一遍的查代码，发现逻辑没有错误，最后在CSDN论坛里发现了这一让我哭笑不得的原因

    2.程序的几种"退出"

    我用到了最后一个，，

   


    3.主窗体关闭时事件的触发

    在VS代码窗口，我们不能像VB6.0一样，通过下拉框选择控件A，继而级联选择A的所有事件，再写事件触发代码

    只能在窗体设计页面，选中控件，点击属性窗口的闪电符号"事件"，双击空白处，这样后台才会生成相应的事件代码，供我们使用

   


    学生上机界面窗体关闭时的代码：

   

#region 窗体关闭时触发该事件-韩林-2016年3月14日14:25:10

private void frm_GU_Main_FormClosing(object sender, FormClosingEventArgs e)
{
DialogResult result = MessageBox.Show("关闭该窗体将下机，是否继续？", "提示信息", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
if (result == DialogResult.OK)
{
e.Cancel = false;  //点击OK
//存入数据库T_OnLineInfo表下机信息
Entity.onLineEntity onLineInfo = new onLineEntity();
onLineInfo.outDate = DateTime.Now.ToString("yyyy/MM/dd");
onLineInfo.outTime = DateTime.Now.ToString("HH:mm:ss");
onLineInfo.conTime = txtConsumedLength.Text.ToString().Trim();
onLineInfo.conCash = txtConsumedCash.Text.ToString().Trim();
onLineInfo.cardID = UI.Common.CommonClass.CurrentUserId;
onLineInfo.IsOnLine = "正常下机";
//存入卡表下机信息，写入余额
Entity.cardEntity cardInfo = new cardEntity();
cardInfo.leftCash = txtBalance.Text.ToString().Trim();
Facade.LoginFa outFa = new Facade.LoginFa();
outFa.loginOut(cardInfo, onLineInfo);
System.Environment.Exit(0);//此语句很重要，结束线程少不了
}
else
{
e.Cancel = true;
}
}

#endregion

    4.将泛型的值赋给datagridview，并设置列名

   

lineHis=queryLineFa.queryLine(lineInfo);
dataGridView1.DataSource = (from p in lineHis
select new
{
上机日期=p.loginDate,
上机时间=p.loginTime,
下机日期=p.outDate,
下机时间=p.outTime,
消费时间=p.conTime,
消费金额=p.conCash
}).ToList();

    5.操作员、管理员的主窗体，也是实时刷新的

   


   

private void timer1_Tick(object sender, EventArgs e)
{
Facade.QueryLineHistory queryFa = new Facade.QueryLineHistory();
List<onLineEntity> lineList = new List<onLineEntity>();
lineList = queryFa.getLine();
dataGridView1.DataSource = (from p in lineList
select new
{
卡号 = p.cardID,
上机时间 = p.loginDate,
上机日期 = p.loginTime,
机器号 = p.pcNo
}).ToList();
string numStu = lineList.Count.ToString();
string leftNum = (200 - int.Parse(numStu)).ToString().Trim();
lblLineNum.Text = "当前共有 " + numStu + " 个学生上机," + "剩余 " + leftNum + " 台机器可用。";
}

private void 显示全部ToolStripMenuItem_Click(object sender, EventArgs e)
{
timer1_Tick(sender, e);
}

private void 强制个人下机ToolStripMenuItem1_Click(object sender, EventArgs e)
{
UI.Common.CommonClass.downStu = dataGridView1.CurrentRow.Cells[0].Value.ToString().Trim();
//存入数据库T_OnLineInfo表下机信息
Entity.onLineEntity onLineInfo = new onLineEntity();
onLineInfo.outDate = DateTime.Now.ToString("yyyy/MM/dd");
onLineInfo.outTime = DateTime.Now.ToString("HH:mm:ss");
onLineInfo.cardID = UI.Common.CommonClass.downStu;
Facade.LoginFa outFa = new Facade.LoginFa();
bool flag = outFa.loginOutSingle(onLineInfo);
if (flag == false)
{
MessageBox.Show("下机失败！", "提示");
return;
}
else
{
MessageBox.Show("强制下机成功！", "提示");
}
}

private void 强制所有学生下机ToolStripMenuItem_Click(object sender, EventArgs e)
{
for (int i = dataGridView1.RowCount - 1; i >= 0; i--)
{
string downCardId = dataGridView1.Rows[i].Cells[0].Value.ToString().Trim();
UI.Common.CommonClass.downStu = downCardId;
//存入数据库T_OnLineInfo表下机信息
Entity.onLineEntity onLineInfo = new onLineEntity();
onLineInfo.outDate = DateTime.Now.ToString("yyyy/MM/dd");
onLineInfo.outTime = DateTime.Now.ToString("HH:mm:ss");
onLineInfo.cardID = UI.Common.CommonClass.downStu;
Facade.LoginFa outFa = new Facade.LoginFa();
bool flag = outFa.loginOutSingle(onLineInfo);
if (flag == false)
{
MessageBox.Show("下机失败！", "提示");
return;
}
}
}

   

    6.两行代码解决报表问题

    详情点击：http://blog.csdn.net/u010928364/article/details/39808995

       

    希望能给有需要的人一点帮助