Question

目前，当我按下我之前的按钮时，它只会将结果返回到我的文本框。我希望它循环结果。因此，第一次单击该按钮时，它将显示第一个记录，循环显示。

protected void btnPrevious_Click1(object sender, EventArgs e)
{
    DAL.TicketsDataSetTableAdapters.TicketDetailsTableAdapter eobj = new DAL.TicketsDataSetTableAdapters.TicketDetailsTableAdapter();
    DataTable dt = new DataTable();
    dt = eobj.GetTicketUpdates(txtSupportRef.Text);

    txtNextStep.Text = eobj.GetTicketData(txtSupportRef.Text).Rows[0]["NextStep"].ToString();
}

我想知道如何返回所有记录，然后根据每次点击循环浏览每一条记录？

这个想法是当你选择一个票据时，它会将最新的细节加载到表单中。但后来我的意图是有一个上一个和下一个按钮，这样我就可以循环显示票证的各种更新......

Answer 1

您需要跟踪点击次数。这样的事情就是你想要的。

protected void btnPrevious_Click1(object sender, EventArgs e)
{
    if (Session["ClickCount"] == null)
        Session["ClickCount"] = 0;

    int ClickCount = Convert.ToInt32(Session["ClickCount"]) + 1;
    Session["ClickCount"] = ClickCount;

    DAL.TicketsDataSetTableAdapters.TicketDetailsTableAdapter eobj = new DAL.TicketsDataSetTableAdapters.TicketDetailsTableAdapter();
    DataTable dt = new DataTable();
    eobj.GetTicketUpdates(txtSupportRef.Text);

    txtNextStep.Text = eobj.GetTicketData(txtSupportRef.Text).Rows[ClickCount - 1]["NextStep"].ToString();
}

Answer 2

根据当前值更改数据库选择方法以获取下一个和previos票证更新。期望txtNextStep.Tag包含对当前故障单更新代码的引用可能如下所示：

    protected void btnNext_Click1(object sender, EventArgs e)
    {
        DAL.TicketsDataSetTableAdapters.TicketDetailsTableAdapter eobj = new DAL.TicketsDataSetTableAdapters.TicketDetailsTableAdapter();
        DataTable dt = new DataTable();
        if (txtNextStep.Tag == null)//Pick first update.
            dt = eobj.GetTicketFirstUpdate(txtSupportRef.Text);
        else//Getting next ticket update for the ticket based on current displaying value
            dt = eobj.GetNextTicketUpdate(txtSupportRef.Text, (string)txtNextStep.Tag);

        if (dt.Rows.Count != 0)
        {
            txtNextStep.Text = dt.Rows[0]["NextStep"].ToString();
            txtNextStep.Tag = dt.Rows[0]["Id"].ToString();
        }
    }

对于性能考虑因素，读取多个故障单更新ID可能是有意义的，因此在按下按钮的情况下，将执行id读取而不搜索下一个或上一个故障单更新。

Answer 3

就个人而言，我会有一个跟踪当前“点击”的计数。用户所在，如下：

protected void btnPrevious_Click1(object sender, EventArgs e)
{
    if(stepCount == 0)
        //Ensuring that we never get into minus numbers
        stepCount = 0;

    stepCount--;

    DAL.TicketsDataSetTableAdapters.TicketDetailsTableAdapter eobj = new DAL.TicketsDataSetTableAdapters.TicketDetailsTableAdapter();
    DataTable dt = new DataTable();
    dt = eobj.GetTicketUpdates(txtSupportRef.Text);

    txtNextStep.Text = eobj.GetTicketData(txtSupportRef.Text).Rows[0][stepCount].ToString();
}

protected void btnNext_Click1(object sender, EventArgs e)
{
    if(stepCount == 0)
        //Ensuring that we never get into minus numbers
        stepCount = 0;

    stepCount++;

    DAL.TicketsDataSetTableAdapters.TicketDetailsTableAdapter eobj = new DAL.TicketsDataSetTableAdapters.TicketDetailsTableAdapter();
    DataTable dt = new DataTable();
    dt = eobj.GetTicketUpdates(txtSupportRef.Text);

    txtNextStep.Text = eobj.GetTicketData(txtSupportRef.Text).Rows[0][stepCount].ToString();
}

您还可以在下一个按钮点击中添加一个检查，以检查用户当前是否在最后一条记录上，如果是，请将它们再次发送到记录列表的开头。

Answer 4

您不想在视图代码中执行此操作，而是希望缓存查找结果，并且只显示“下一步”按钮，如果还有其他项目。

为此，为它们制作一个容器对象。

假设您的数据是这样的

class Ticket
{
     public string SomeField{get;set;}
}

制作像

这样的容器

class TicketList
{
    private List<Ticket> _tickets;
    private int _currentPosition;
    public TicketList<IEnumerable<Ticket> tickets>
    {
        _tickets = ticket;
        _currentPosition = 0;
    }

    public Ticket GetCurrent()
    {
        return _tickets[_currentPosition];
    }

    public bool CanMoveNext{
        get{
            return _tickets.Any() && _currentTicket != _tickets.Count - 1;
        }
    }


    public Ticket GetNext()
    {
        _currentPosition++;
        return _tickets[_currentPosition];
    }
}

现在，当您加载应用程序时，将票证加载到缓存

var tickets = new List<Ticket>();
var data = eobj.GetTicketData(txtSupportRef.Text);
foreach(var row in data.Rows)
{
    var ticket = new Ticket{ 
        //map over the ticket data here, or use AutoMapper
    };
    tickets.Add(ticket);
}

var ticketList = new TicketList(tickets);
Cache.Store(ticketList);  //cache can be an application var, or better solution

在页面加载上，你可以这样做 var ticketList = Cache.GetTicketList(); btnNext.Visible = ticketList.CanMoveNext; var ticket = ticketList.GetCurrent(); //populate your fields

现在，除了不在每次加载页面时重新加载所有票证，您的代码将来会更容易维护。

使用C＃和tableadapter循环结果

4 个答案: