Question

所以我目前正在学习ASP.NET，实际上今天是我的第二天。

所以现在我想要创建一个页面，其中我首先有一个动态生成的下拉列表，它只选择数据库和表中的第一个名称。我有工作

接下来我有一个gridview表，显示数据库中的所有数据，目前我已经硬编码了一个名称，因此页面不会崩溃（有100000行数据）

最后，当我发布我的代码时，你会看到一个复选框，就在我点击它时，gridview会显示出来。我只是试着这样做，因为这是我今天学到的一课的一部分。

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1>Test of First Database pull</h1>
        <asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" Text="Show Panel" OnCheckedChanged="checkbox1_CheckedChanged" />
        <br />
         <br />
        <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource2" DataTextField="FirstName" DataValueField="FirstName" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"></asp:DropDownList>
         <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:ASP.NETConnectionString1 %>" ProviderName="<%$ ConnectionStrings:ASP.NETConnectionString1.ProviderName %>" SelectCommand="SELECT DISTINCT [FirstName] FROM [SampleData] ORDER BY 'FirstName' "></asp:SqlDataSource>

         <br />
         <br />
        <asp:Panel ID="Panel1" runat="server" Visible="False" >
            <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1" EmptyDataText="There are no data records to display.">
                <Columns>
                    <asp:BoundField DataField="SSN" HeaderText="SSN" SortExpression="SSN" />
                    <asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
                    <asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />
                    <asp:BoundField DataField="HomeStreet" HeaderText="HomeStreet" SortExpression="HomeStreet" />
                    <asp:BoundField DataField="HomeCity" HeaderText="HomeCity" SortExpression="HomeCity" />
                    <asp:BoundField DataField="HomeState" HeaderText="HomeState" SortExpression="HomeState" />
                    <asp:BoundField DataField="HomeZip" HeaderText="HomeZip" SortExpression="HomeZip" />
                    <asp:BoundField DataField="CompanyName" HeaderText="CompanyName" SortExpression="CompanyName" />
                    <asp:BoundField DataField="CompanyStreet" HeaderText="CompanyStreet" SortExpression="CompanyStreet" />
                    <asp:BoundField DataField="CompanyCity" HeaderText="CompanyCity" SortExpression="CompanyCity" />
                    <asp:BoundField DataField="CompanyState" HeaderText="CompanyState" SortExpression="CompanyState" />
                    <asp:BoundField DataField="CompanyZip" HeaderText="CompanyZip" SortExpression="CompanyZip" />
                    <asp:BoundField DataField="HomePhone" HeaderText="HomePhone" SortExpression="HomePhone" />
                    <asp:BoundField DataField="CompanyPhone" HeaderText="CompanyPhone" SortExpression="CompanyPhone" />
                    <asp:BoundField DataField="CellPhone" HeaderText="CellPhone" SortExpression="CellPhone" />
                    <asp:BoundField DataField="DateOfBirth" HeaderText="DateOfBirth" SortExpression="DateOfBirth" />
                    <asp:BoundField DataField="DateOfHire" HeaderText="DateOfHire" SortExpression="DateOfHire" />
                </Columns>
            </asp:GridView>
            <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ASP.NETConnectionString1 %>" 
                ProviderName="<%$ ConnectionStrings:ASP.NETConnectionString1.ProviderName %>" 
                SelectCommand="SELECT [SSN], [LastName], [FirstName], [HomeStreet], [HomeCity], [HomeState], [HomeZip], [CompanyName], 
                [CompanyStreet], [CompanyCity], [CompanyState], [CompanyZip], [HomePhone], [CompanyPhone], [CellPhone], 
                [DateOfBirth], [DateOfHire] FROM [SampleData] WHERE [FirstName] = 'Bob' "></asp:SqlDataSource>


        </asp:Panel>
    </div>
    </form>
</body>
</html>

这是我调用会话的C＃部分

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Demos_GridView : System.Web.UI.Page
{


    protected void Page_Load(object sender, EventArgs e)
    {
          string name = DropDownList1.SelectedValue;
           Session["FName"] = name;
    }
    protected void checkbox1_CheckedChanged(object sender, EventArgs e)
    {
        Panel1.Visible = CheckBox1.Checked;
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {

    }
}

如你所见，我打电话给会议“我相信”我尝试使用这个

 <%:Session["user"]%>

在该sql查询中，但它说我不能拥有＆lt; %%＆gt;在asp sql调用中。所以，如果有人能帮助我，这将是惊人的。

Answer 1

也许您应该将用户名添加为SqlParameter？

SqlDataSource1.SelectParameters.Add(new SqlParameter("@Name", name));
// Of course don't forget to edit your query: WHERE [FirstName] = @Name

上述内容应该有效（注意我还没有测试过）。

修改

您可以通过配置SqlDataSource以从@Name或Control设置Session参数的值来进一步缩短此过程。

根据动态下拉列表中的选择生成表格？

1 个答案: