Question

我正在使用Visual Studio在C＃中创建一个asp.net Web应用程序。我有一个注册页面，孩子们可以注册，然后将他们的详细信息发送到我的数据库中的“子”表，点击“查看注册的孩子”按钮后，会打开一个新页面，显示名字，DOB和用户名（ pk）每个孩子都注册了。事实上，DOB存储并读作'04 / 02/2006'。我现在需要找到一种方法来从DOB获得年龄，并能够按年龄组（6-10,11-13,14-16）查看孩子。

我想知道最简单的方法是什么？每个年龄组的单选按钮，选中后，仅显示gridview中该年龄组的子项。或者也许当页面加载并且所有子项都显示在gridview上时，它们已经被分类到年龄组中了？

有人可以告诉我最容易实现这一目标的方法，记住我是C＃＆amp; asp.net！我附上了gridview目前看起来的截图。提前谢谢。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Configuration;
using System.Data.SqlClient;

namespace Coursework
{
public partial class Testy1 : System.Web.UI.Page
{
    //create a datasource
    SqlDataSource source = new SqlDataSource();

    protected void Page_Load(object sender, EventArgs e)
    {
        //always set some defaults for the sqldatasource
        source.ID = "source1";
        SqlConnection connectionString = new SqlConnection(ConfigurationManager.ConnectionStrings["newregDBConnectionString"].ConnectionString);
        source.SelectCommand = "SELECT firstname, dob, DATEDIFF(hour, dob, GETDATE()) / 8766 AS age FROM table ORDER BY age";

        if (!IsPostBack)
        {
            //bind the grid
            GridView1.DataSource = source;
            GridView1.DataBind();
        }
    }

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        //the new database query, now with where clause
        source.SelectCommand = "SELECT firstname, dob, DATEDIFF(hour, dob, GETDATE()) / 8766 AS age FROM table WHERE (DATEDIFF(hour, dob, GETDATE()) / 8766 BETWEEN @start AND @end) ORDER BY age";

        //get the end age from the dropdown and cast as int
        int end = Convert.ToInt32(DropDownList1.SelectedValue);

        //get the start int for the filter
        int start = end - 5;

        //if the filter is resetted, make sure the query returns all ages
        if (end == 0)
        {
            start = 0;
            end = 99;
        }

        //replace the parameters in the query
        source.SelectParameters.Add("start", start.ToString());
        source.SelectParameters.Add("end", end.ToString());

        //rebind the grid
        GridView1.DataSource = source;
        GridView1.DataBind();
    }
}

}

Answer 1

您可以从此代码段开始。您需要做的第一件事就是编辑从数据库中获取数据的查询。添加以下内容：DATEDIFF(hour, dob, GETDATE()) / 8766 as AGE，这将为您提供数据库中人员的年龄。然后，您可以使用它按年龄进行过滤。

然后将DropDownList添加到包含OnSelectedIndexChanged事件且AutoPostback设置为true的网页。

<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
    <asp:ListItem Text="Filter age" Value="0"></asp:ListItem>
    <asp:ListItem Text="0 - 5" Value="5"></asp:ListItem>
    <asp:ListItem Text="6 - 10" Value="10"></asp:ListItem>
    <asp:ListItem Text="10 - 15" Value="15"></asp:ListItem>
</asp:DropDownList>

<asp:GridView ID="GridView1" runat="server">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <%# Eval("firstname") %>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <ItemTemplate>
                <%# Convert.ToDateTime(Eval("dob")).ToString("d MMMM yyyy") %>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <ItemTemplate>
                <%# Eval("age") %>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

然后在代码背后

using System;
......

namespace Project1
{
    public partial class WebForm1: System.Web.UI.Page
    {
        //create a datasource
        SqlDataSource source = new SqlDataSource();

        protected void Page_Load(object sender, EventArgs e)
        {
            //always set some defaults for the sqldatasource
            source.ID = "source1";
            source.ConnectionString = "connectionString";
            source.SelectCommand = "SELECT firstname, dob, DATEDIFF(hour, dob, GETDATE()) / 8766 AS age FROM table ORDER BY age";

            if (!IsPostBack)
            {
                //bind the grid
                GridView1.DataSource = source;
                GridView1.DataBind();
            }
        }

        protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
        {
            //the new database query, now with where clause
            source.SelectCommand = "SELECT firstname, dob, DATEDIFF(hour, dob, GETDATE()) / 8766 AS age FROM table WHERE (DATEDIFF(hour, dob, GETDATE()) / 8766 BETWEEN @start AND @end) ORDER BY age";

            //get the end age from the dropdown and cast as int
            int end = Convert.ToInt32(DropDownList1.SelectedValue);

            //get the start int for the filter
            int start = end - 5;

            //if the filter is resetted, make sure the query returns all ages
            if (end == 0)
            {
                start = 0;
                end = 99;
            }

            //replace the parameters in the query
            source.SelectParameters.Add("start", start.ToString());
            source.SelectParameters.Add("end", end.ToString());

            //rebind the grid
            GridView1.DataSource = source;
            GridView1.DataBind();
        }
    }
}

按年龄组排序网格视图的最佳方法

1 个答案: