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我有两个文本框和一个按钮。在按钮单击事件中，我将文本框中捕获的值添加为我的 grdiview 中的新行。现在我想要的是当我的页面再次加载时，我的 gridview 将显示我添加到其中的现有数据并在不使用数据库的情况下追加新记录。

这是我的代码：

private void BindGrid(int rowcount)
{
    DataTable dt = new DataTable();
    DataRow dr;

    dt.Columns.Add("First Name", typeof(String));
    dt.Columns.Add("Last Name", typeof(String));

    if (ViewState["CurrentData"] != null)
    {
        for (int i = 0; i < rowcount + 1; i++)
        {
            dt = (DataTable)ViewState["CurrentData"];
            if (dt.Rows.Count > 0)
            {
                dr = dt.NewRow();
                dr[0] = dt.Rows[0][0].ToString();

            }
        }
        dr = dt.NewRow();
        dr[0] = TextBox1.Text;
        dr[1] = TextBox2.Text;
        dt.Rows.Add(dr);
    }
    else
    {
        dr = dt.NewRow();
        dr[0] = TextBox1.Text;
        dr[1] = TextBox2.Text;

        dt.Rows.Add(dr);
    }

    // If ViewState has a data then use the value as the DataSource
    if (ViewState["CurrentData"] != null)
    {
        GridView1.DataSource = (DataTable)ViewState["CurrentData"];
        GridView1.DataBind();
    }
    else
    {
        // Bind GridView with the initial data assocaited in the DataTable
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }
    // Store the DataTable in ViewState to retain the values
    ViewState["CurrentData"] = dt;
}

按钮点击事件：

protected void Button1_Click(object sender, EventArgs e)
{
    // Check if the ViewState has a data assoiciated within it. If
    if (ViewState["CurrentData"] != null)
    {
        DataTable dt = (DataTable)ViewState["CurrentData"];
        int count = dt.Rows.Count;
        BindGrid(count);
    }
    else
    {
        BindGrid(1);
    }
    TextBox1.Text = string.Empty;
    TextBox2.Text = string.Empty;
    TextBox1.Focus();
}

这是我的 ASPX 页面：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs"   Inherits="Default2" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
        <title></title>
     </head>
    <body>
        <form id="form1" runat="server">
       <div>

        <asp:TextBox ID="TextBox1" runat="server"/>&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:TextBox ID="TextBox2" runat="server"/>&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:Button ID="Button1" runat="server" Text="Add" OnClick="Button1_Click" />
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<asp:GridView          ID="GridView1" runat="server" CellPadding="4" ForeColor="#333333" 
            GridLines="None" > <AlternatingRowStyle BackColor="White" />
            <EditRowStyle BackColor="#2461BF" />
         <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
         <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
        <RowStyle BackColor="#EFF3FB" />
        <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
        <SortedAscendingCellStyle BackColor="#F5F7FB" />
        <SortedAscendingHeaderStyle BackColor="#6D95E1" />
         <SortedDescendingCellStyle BackColor="#E9EBEF" />
         <SortedDescendingHeaderStyle BackColor="#4870BE" />
       </asp:GridView>

        &nbsp;</div>
        </form>
    </body>
  </html>
4

1 回答 1

2

这是一个适合您的代码

private void BindGrid()
{
    GridView1.DataSource = GetDataTable();
    GridView1.DataBind();
}

protected void Button1_Click(object sender, EventArgs e)
{
    DataRow dr;
    DataTable dt = GetDataTable();
    dr = dt.NewRow();
    dr[0] = TextBox1.Text;
    dr[1] = TextBox2.Text;
    dt.Rows.Add(dr);
    ViewState["CurrentData"] = dt;
    TextBox1.Text = string.Empty;
    TextBox2.Text = string.Empty;
    TextBox1.Focus();
    //**updated**
    BindGrid();
}

protected DataTable GetDataTable()
{
    DataTable dt;
    if (ViewState["CurrentData"] != null)
    {
        dt = (DataTable)ViewState["CurrentData"];
    }
    else
    {
        dt = new DataTable();
        dt.Columns.Add("First Name", typeof(String));
        dt.Columns.Add("Last Name", typeof(String));
        //**Update**/
        ViewState["CurrentData"] = dt;
    }
    return dt;
}

BindGrid并在页面加载时调用该函数。

编辑-1

如果您在访问另一个页面后想要它，那么您应该使用session而不是viewstate
相应地更改功能

protected DataTable GetDataTable()
{
    DataTable dt;
    if (Session["CurrentData"] != null)
    {
        dt = (DataTable)Session["CurrentData"];
    }
    else
    {
        dt = new DataTable();
        dt.Columns.Add("First Name", typeof(String));
        dt.Columns.Add("Last Name", typeof(String));
        Session["CurrentData"] = dt;
    }
    return dt;
}
于 2013-02-07T09:11:26.213 回答