我正在使用Visual Studio 2013中的C＃和ASP.net编写数据库的数据输入表单。我正在尝试构建的表单允许我输入Nintendo Power Magazine的前30名结果轮询到数据库中的表。
有问题的页面的计划是有一个GridView，以便我可以看到我已输入的结果，以及将用于实际数据输入的FormView。为了简化这个过程我通过一个下拉菜单来解决问题和游戏，为了避免混淆NES的“Duck Tales”和Game Boy的“Duck Tales”，我设置了一个额外的下拉菜单菜单选择游戏发布的系统。反过来，该菜单的结果将决定哪些游戏将出现在“游戏”下拉列表中。
所以，我几乎把这个表单放在一起了 - 但是，我在测试表单时遇到了问题。当我从下拉菜单中选择系统时，我收到以下错误消息：
无法将文件'C：\ Users \ TEST \ Documents \ Visual Studio 2013 \ WebSites \ NPPollDataEntry \ App_Data \ aspnet-NPPollDataEntry-14ef47ad-43d0-4a7d-b1c9-de351dbca3d5.mdf'作为数据库'aspnet-NPPollDataEntry-附加14ef47ad-43d0-4a7d-b1c9-de351dbca3d5' 。
我做错了什么？
表单页面：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ResultsEntryForm.aspx.cs" Inherits="ResultsEntryForm" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="ResultsDataEntryForm" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AutoGenerateColumns="False" DataSourceID="PollResultsDataSource"
AllowSorting="True">
<Columns>
<asp:BoundField DataField="Issue_Date" HeaderText="Issue_Date"
SortExpression="Issue_Date" />
<asp:BoundField DataField="Platform_Type" HeaderText="Platform_Type"
SortExpression="Platform_Type" />
<asp:BoundField DataField="Element_Title" HeaderText="Element_Title"
SortExpression="Element_Title" />
<asp:BoundField DataField="Poll_Score" HeaderText="Poll_Score"
SortExpression="Poll_Score" />
</Columns>
</asp:GridView>
<asp:FormView ID="ResultsFormView" runat="server" AllowPaging="True"
DataSourceID="PollResultsDataSource">
<InsertItemTemplate>
Issue_Date:
<asp:DropDownList ID="IssueDateDropDownList" runat="server" AutoPostBack="True"
DataSourceID="IssueDateDropDownDataSource" DataTextField="Issue_Date"
DataValueField="Issue_ID">
</asp:DropDownList>
<br />
Platform_Type:
<asp:DropDownList ID="PlatformDropDownList" runat="server"
DataSourceID="PlatformDropDownDataSource" DataTextField="Platform_Type"
DataValueField="Platform_ID" AutoPostBack="True"
OnSelectedIndexChanged="PlatformDropDownList_SelectedIndexChanged">
</asp:DropDownList>
<br />
Element_Title:
<asp:DropDownList ID="TitleDropDownList" runat="server" AutoPostBack="True">
</asp:DropDownList>
<br />
Poll_Score:
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
<asp:LinkButton ID="InsertButton" runat="server" CausesValidation="True"
CommandName="Insert" Text="Insert" ValidationGroup="Insert" />
<asp:LinkButton ID="InsertCancelButton" runat="server"
CausesValidation="False" CommandName="Cancel" Text="Cancel" />
</InsertItemTemplate>
<ItemTemplate>
Issue_Date:
<asp:Label ID="Issue_DateLabel" runat="server"
Text='<%# Bind("Issue_Date") %>' />
<br />
Platform_Type:
<asp:Label ID="Platform_TypeLabel" runat="server"
Text='<%# Bind("Platform_Type") %>' />
<br />
Element_Title:
<asp:Label ID="Element_TitleLabel" runat="server"
Text='<%# Bind("Element_Title") %>' />
<br />
Poll_Score:
<asp:Label ID="Poll_ScoreLabel" runat="server"
Text='<%# Bind("Poll_Score") %>' />
<br />
<asp:LinkButton ID="EditButton" runat="server" CausesValidation="False"
CommandName="Edit" Text="Edit" />
<asp:LinkButton ID="NewButton" runat="server" CausesValidation="False"
CommandName="New" Text="New" />
</ItemTemplate>
</asp:FormView>
</div>
<asp:SqlDataSource ID="PollResultsDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:NintendoPowerPollConnectionString %>"
InsertCommand="INSERT INTO Poll_Results(Issue_ID, Element_Group_ID, Poll_Score) VALUES (@Issue_ID, @Element_Group_ID, @Poll_Score)"
SelectCommand="SELECT NintendoPowerIssue.Issue_Date, na_lkpPlatformTypes.Platform_Type, na_Games.Element_Title, Poll_Results.Poll_Score
FROM Poll_Results INNER JOIN NintendoPowerIssue ON Poll_Results.Issue_ID = NintendoPowerIssue.Issue_ID
INNER JOIN na_Games ON Poll_Results.Element_Group_ID = na_Games.Element_Group_ID
INNER JOIN na_lkpPlatformTypes ON na_Games.Platform_ID = na_lkpPlatformTypes.Platform_ID"
UpdateCommand="UPDATE Poll_Results SET Poll_Score = @Poll_Score
FROM Poll_Results
INNER JOIN na_Games ON Poll_Results.Element_Group_ID = na_Games.Element_Group_ID
INNER JOIN NintendoPowerIssue ON Poll_Results.Issue_ID = NintendoPowerIssue.Issue_ID
WHERE (Poll_Results.Issue_ID = @Issue_ID) AND (Poll_Results.Element_Group_ID = @Element_Group_ID)">
<InsertParameters>
<asp:Parameter Name="Issue_ID" />
<asp:Parameter Name="Element_Group_ID" />
<asp:Parameter Name="Poll_Score" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="Poll_Score" />
<asp:Parameter Name="Issue_ID" />
<asp:Parameter Name="Element_Group_ID" />
</UpdateParameters>
</asp:SqlDataSource>
<asp:SqlDataSource ID="IssueDateDropDownDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:NintendoPowerPollConnectionString %>"
SelectCommand="SELECT [Issue_ID], [Issue_Date] FROM [NintendoPowerIssue]">
</asp:SqlDataSource>
<asp:SqlDataSource ID="PlatformDropDownDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:NintendoPowerPollConnectionString %>"
SelectCommand="SELECT [Platform_ID], [Platform_Type] FROM [na_lkpPlatformTypes]" />
</form>
</body>
</html>
返回代码：
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.Data.SqlClient;
using System.Configuration;
public partial class ResultsEntryForm : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
private DataTable BindDropDownList(string field)
{
DataTable dt = new DataTable();
SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString());
try
{
connection.Open();
string sqlStatement = "SELECT [Element_Group_ID], [Element_Title] FROM [na_Games] WHERE ([Platform_ID] = @Platform_ID)";
SqlCommand sqlCmd = new SqlCommand(sqlStatement, connection);
SqlDataAdapter sqlDa = new SqlDataAdapter(sqlCmd);
sqlCmd.Parameters.AddWithValue("@Platform_ID", field);
sqlDa.Fill(dt);
}
catch (System.Data.SqlClient.SqlException ex)
{
Server.ClearError();
Response.Write(ex.Message + ("<br />") + ex.Source);
}
finally
{
connection.Close();
}
return dt;
}
protected void PlatformDropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList ddl1 = (DropDownList)sender;
FormView fv = (FormView)ddl1.NamingContainer;
if (fv != null)
{
DropDownList ddl2 = (DropDownList)fv.FindControl("TitleDropDownList");
{
DataTable dt = BindDropDownList(ddl1.SelectedItem.Value);
ddl2.DataTextField = "Field1";
ddl2.DataValueField = "Field2";
ddl2.DataBind();
}
}
}
}
提前感谢您的帮助。
答案 0 :(得分：1)
答案 1 :(得分：0)
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