Question

两部分问题：

1

我正在使用会话状态刷新来保存页面重新加载的计数，但是当使用一系列if语句时，验证不起作用。代码在底部。我究竟做错了什么？

2 使用会话状态对回发似乎不是最有效的方法，如果我添加了另一个具有相同功能的表，计数将影响两个表。例如，如果我只希望人们能够在一个表中添加最多三行，则在两个表上，他们只能添加四行。

存储单独刷新计数的更好方法是什么？

更新我发现代码没有向现有行添加行的问题，但我不确定如何修复它。

基本上每次迭代都会删除现有行，然后再次添加一行。所以永远不会超过一行。

有什么想法吗？

namespace FormTest
{
    public partial class About : Page
    {
        protected void Page_Load(object sender, System.EventArgs e)
        {
            tbl.BorderStyle = BorderStyle.Inset;
            tbl.BorderWidth = Unit.Pixel(1);

        if (!Page.IsPostBack)
        {
            Session["count"] = 0;
        }
        else
        {
            int count = (int)Session["count"];
            count++;
            Session["count"] = count;
        }
    }

    protected void cmdCreate_Click(object sender, System.EventArgs e)
    {
        tbl.Controls.Clear();

        int rows = 1;
        int cols = 4;

        if ((int)Session["count"] == 0)
        {
            for (int i = 0; i < rows; i++)
            {
                TableRow rowNew = new TableRow();
                tbl.Controls.Add(rowNew);
                for (int j = 0; j < cols; j++)
                {
                    TableCell cellNew = new TableCell();
                    Label lblNew = new Label();
                    lblNew.Text = "(" + i.ToString() + "," + j.ToString() + ")<br />";

                    TextBox tbNew = new TextBox();
                    cellNew.Controls.Add(lblNew);
                    cellNew.Controls.Add(tbNew);

                    rowNew.Controls.Add(cellNew);
                }
            }
        }
        else
        {
            if ((int)Session["count"] == 1)
            {
                for (int i = 0; i < rows; i++)
                {
                    TableRow rowNew = new TableRow();
                    tbl.Controls.Add(rowNew);
                    for (int j = 0; j < cols; j++)
                    {
                        TableCell cellNew = new TableCell();
                        Label lblNew = new Label();
                        lblNew.Text = "(" + i.ToString() + "," + j.ToString() + ")<br />";

                        TextBox tbNew = new TextBox();
                        cellNew.Controls.Add(lblNew);
                        cellNew.Controls.Add(tbNew);

                        rowNew.Controls.Add(cellNew);
                    }
                }
            }
            else
            {
                if ((int)Session["count"] == 2)
                {
                    for (int i = 0; i < rows; i++)
                    {
                        TableRow rowNew = new TableRow();
                        tbl.Controls.Add(rowNew);
                        for (int j = 0; j < cols; j++)
                        {
                            TableCell cellNew = new TableCell();
                            Label lblNew = new Label();
                            lblNew.Text = "(" + i.ToString() + "," + j.ToString() + ")<br />";

                            TextBox tbNew = new TextBox();
                            cellNew.Controls.Add(lblNew);
                            cellNew.Controls.Add(tbNew);

                            rowNew.Controls.Add(cellNew);
                        }
                    }
                }
                else
                {
                    if ((int)Session["count"] == 3)
                    {
                        for (int i = 0; i < rows; i++)
                        {
                            TableRow rowNew = new TableRow();
                            tbl.Controls.Add(rowNew);
                            for (int j = 0; j < cols; j++)
                            {
                                TableCell cellNew = new TableCell();
                                Label lblNew = new Label();
                                lblNew.Text = "(" + i.ToString() + "," + j.ToString() + ")<br />";

                                TextBox tbNew = new TextBox();
                                cellNew.Controls.Add(lblNew);
                                cellNew.Controls.Add(tbNew);

                                rowNew.Controls.Add(cellNew);
                            }
                        }
                    }
                    else
                    {
                        Response.Redirect("http://www.google.co.uk");
                    }
                }
            }
        }

    }//end cmdCreate_Click
}
}

Answer 1

您不需要if条件列表，只需要确保行数小于您想要的限制。如果/当添加更多表时，您还应该存储每个表的限制以避免计数冲突。

我就是这样做的：

（注意：这不会“原样” - 我假设您已移除代码以在tbl内分配cmdCreate_Click()并保留原样清晰度）

namespace FormTest { public partial class About : Page { private int myFirstTableMaxRows = 3; protected void Page_Load(object sender, System.EventArgs e) { tbl.BorderStyle = BorderStyle.Inset; tbl.BorderWidth = Unit.Pixel(1); if (!Page.IsPostBack) { Session["myFirstTable_count"] = "0"; } else { int count = (int)Session["myFirstTable_count"]; Session["myFirstTable_count"] = ++count; } } protected void cmdCreate_Click(object sender, System.EventArgs e) { tbl.Controls.Clear(); int cols = 4; int currentRowCount = (int)Session["myFirstTable_count"]; if(currentRowCount <= myFirstTableMaxRows) { TableRow rowNew = new TableRow(); tbl.Controls.Add(rowNew); for (int j = 0; j < cols; j++) { TableCell cellNew = new TableCell(); Label lblNew = new Label(); lblNew.Text = "(" + i.ToString() + "," + j.ToString() + ")<br />"; TextBox tbNew = new TextBox(); cellNew.Controls.Add(lblNew); cellNew.Controls.Add(tbNew); rowNew.Controls.Add(cellNew); } } else { Response.Redirect("http://www.google.co.uk"); } }//end cmdCreate_Click }

问题修改后更新

现有的行将由代码中的这一行引起：

tbl.Controls.Clear();

正在清除表格，然后根据cmdCreate_Click()方法中的逻辑添加一行。

表c＃上的动态行

1 个答案: