**麻烦前辈们指点一下，我这个做的功能是点击GRIDVIEW中自带的选择功能后将选定行的第一个格子的内容赋值给上面的CID1，CID2，然后在下面有个提交功能要用到这个CID1和CID2。但是CID1，CID2的值到下面提交功能就为空。 **
这张图到第一个断点时CD1和CD3都成功赋值
到第二个断点时，CD2和CD4成功赋值，但是此时CD1的值为空。
再到下面用到CD1和CD2的提交功能设定的断点时CD1和CD2的值都为空
我有试过直接赋值给CID1和CID2而不用CID3和CID4，这样的还是结果一样。
CD1和CD2的赋值到提交功能的使用中间并没有经过任何赋值的步骤。
这是那两个BTN的前端
这是那两个IF的筛选条件也是BTN的功能赋值
下面是后端代码：
using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class HTML_ChooseCourse : System.Web.UI.Page
{
string CID1="";
string CID2="";
protected void Page_Load(object sender, EventArgs e)
{
}
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
int index = GridView1.SelectedIndex;
if (this.BtnTuesday.Enabled == false && this.BtnThursday.Enabled == true)
{
this.LabTuesday.Text = GridView1.Rows[index].Cells[1].Text;
string CID3 =GridView1.Rows[index].Cells[0].Text.ToString();
CID1 = CID3;
}
if (this.BtnTuesday.Enabled == true & this.BtnThursday.Enabled == false)
{
this.LabThursday.Text = GridView1.Rows[index].Cells[1].Text;
string CID4 = GridView1.Rows[index].Cells[0].Text.ToString();
CID2 = CID4;
}
if (this.BtnTuesday.Enabled == true & this.BtnThursday.Enabled == true)
{
Messagebox(" 您还没选择周次");
}
}
protected void BtnTuesday_Click(object sender, EventArgs e)
{
this.BtnTuesday.Enabled = false;
this.BtnTuesday.Font.Underline = true;
this.BtnThursday.Enabled = true;
this.BtnThursday.Font.Underline = false;
}
protected void BtnThursday_Click(object sender, EventArgs e)
{
this.BtnThursday.Enabled = false;
this.BtnThursday.Font.Underline = true;
this.BtnTuesday.Enabled = true;
this.BtnTuesday.Font.Underline = false;
}
public static void Messagebox(string message)
{
string strScript = "<script type=\"text/javascript\" language=\"javascript\">alert('" + message + "')</script>";
System.Web.UI.Page thisPage = (System.Web.UI.Page)System.Web.HttpContext.Current.Handler;
thisPage.ClientScript.RegisterStartupScript(thisPage.GetType(), "ShowMsgBox", strScript);
}
protected void BtnSubmit_Click(object sender, EventArgs e)
{
if (this.LabThursday.Text != "" && this.LabTuesday.Text != "")
{
string connectionstr = "Data Source=DESKTOP-79153UB;Initial Catalog=db_StudentManage;Integrated Security=True";
SqlConnection connection = new SqlConnection(connectionstr);
connection.Open();
SqlCommand command = new SqlCommand();
command.Connection = connection;
command.CommandText = string.Format("insert into tb_ChooseCourse values ('{0}','{1}','周一')",
CID1.ToString(),Session["ID"].ToString());
int count1 = command.ExecuteNonQuery();
command.CommandText = string.Format("insert into tb_ChooseCourse values ('{0}','{1}','周二')",
CID2.ToString(), Session["ID"].ToString());
int count2 = command.ExecuteNonQuery();
int count3=count1+count2;
if (count3 == 2)
Messagebox("提交成功");
else
Messagebox("提交失败，请重试！");
}
else
Messagebox("有信息为空，请继续选课!");
}
}
}
下面是前端代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ChooseCourse.aspx.cs" Inherits="HTML_ChooseCourse" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>选课</title>
<style>
.TopDiv
{
border: 0px solid black;
width:100%;
height: 60px;
position: absolute;
left: 20px;
top: 20px;
text-align:center;
}
.MiddleDiv {
border: 0px solid black;
width: 680px;
height: 290px;
position: absolute;
left:320px;
top: 180px;
}
.SecondDiv {
border: 0px solid black;
width: 894px;
height: 50px;
position: absolute;
left:320px;
top: 100px;
}
.btn {
border-style: none;
border-color: inherit;
border-width: medium;
background-color: #62a8ea;
line-height: 45px;
color: white;
cursor: pointer;
font-size: 16px;
font-weight: bold;
}
</style>
</head>
<body style="background-color:#E6E6E6">
<form id="form1" runat="server">
<div class="TopDiv" style="font-family:幼圆;font-size:50px">
选课
</div>
<div class="SecondDiv">
<table style="background-color:#E6E6E6">
<tr>
<td><asp:Button ID="BtnTuesday" CssClass="btn" runat="server" OnClick="BtnTuesday_Click" Text="周二" Height="50px" Width="90px" Font-Underline="False" /></td>
<td style="font-family:幼圆;background-color:#E6E6E6;text-align:center"><asp:Label ID="LabTuesday" runat="server" Height="50px" Width="200px" BackColor="Silver" ></asp:Label></td>
<td><asp:Button ID="BtnThursday" CssClass="btn" runat="server" OnClick="BtnThursday_Click" Text="周四" Height="50px" Width="90px"/></td>
<td style="font-family:幼圆;background-color:#E6E6E6;text-align:center"><asp:Label ID="LabThursday" runat="server" Height="50px" Width="200px" BackColor="Silver"></asp:Label></td>
<td><asp:Button ID="BtnSubmit" CssClass="btn" runat="server" Text="提交" Height="50px" Width="90px" OnClick="BtnSubmit_Click"/></td>
</tr>
</table>
</div>
<div class="MiddleDiv">
<asp:GridView style="text-align:center;font-family:幼圆;" Height="370px" Width="676px" ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False" CellPadding="4" DataKeyNames="CId" DataSourceID="SqlDataSource1" ForeColor="#333333" GridLines="None" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" OnSelectedIndexChanging="GridView1_SelectedIndexChanging">
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<Columns>
<asp:BoundField DataField="CId" HeaderText="课程ID" ReadOnly="True" SortExpression="CId" />
<asp:BoundField DataField="CName" HeaderText="课程姓名" SortExpression="CName" />
<asp:BoundField DataField="TID" HeaderText="负责教师ID" SortExpression="TID" />
<asp:CommandField HeaderText="操作" ShowSelectButton="True" />
</Columns>
<EditRowStyle BackColor="#999999" />
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#E9E7E2" />
<SortedAscendingHeaderStyle BackColor="#506C8C" />
<SortedDescendingCellStyle BackColor="#FFFDF8" />
<SortedDescendingHeaderStyle BackColor="#6F8DAE" />
</asp:GridView>
<br />
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConflictDetection="CompareAllValues" ConnectionString="<%$ ConnectionStrings:db_StudentManageConnectionString %>" DeleteCommand="DELETE FROM [tb_Course] WHERE [CId] = @original_CId AND (([CName] = @original_CName) OR ([CName] IS NULL AND @original_CName IS NULL)) AND (([TID] = @original_TID) OR ([TID] IS NULL AND @original_TID IS NULL))" InsertCommand="INSERT INTO [tb_Course] ([CId], [CName], [TID]) VALUES (@CId, @CName, @TID)" OldValuesParameterFormatString="original_{0}" SelectCommand="SELECT * FROM [tb_Course]" UpdateCommand="UPDATE [tb_Course] SET [CName] = @CName, [TID] = @TID WHERE [CId] = @original_CId AND (([CName] = @original_CName) OR ([CName] IS NULL AND @original_CName IS NULL)) AND (([TID] = @original_TID) OR ([TID] IS NULL AND @original_TID IS NULL))">
<DeleteParameters>
<asp:Parameter Name="original_CId" Type="String" />
<asp:Parameter Name="original_CName" Type="String" />
<asp:Parameter Name="original_TID" Type="String" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="CId" Type="String" />
<asp:Parameter Name="CName" Type="String" />
<asp:Parameter Name="TID" Type="String" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="CName" Type="String" />
<asp:Parameter Name="TID" Type="String" />
<asp:Parameter Name="original_CId" Type="String" />
<asp:Parameter Name="original_CName" Type="String" />
<asp:Parameter Name="original_TID" Type="String" />
</UpdateParameters>
</asp:SqlDataSource>
</div>
</form>
</body>
</html>
