为什么我的下拉列表没有工作？ [英] Why my drop down list did not working?
本文介绍了为什么我的下拉列表没有工作？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我尝试使用OleDB阅读器从我的下拉列表中读取excel表中的数据，但它没有工作。我尝试将插入和选择的查询结合起来，但它只在INSERT上起作用，但对SELECT不起作用。对我的问题有什么解决方案吗？
我尝试过：
I try to read data from excel sheet for my drop down list using OleDB reader but it did not working. I try to combine the query for insert and select but it just function on INSERT only but for SELECT not. It's there any solution for my problem?
What I have tried:
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
.auto-style2{
width:103px;
text-align:right;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<table class="auto-style1">
<tr>
<td class="auto-style2">UserNTID:</td>
<td>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="auto-style2">SerialNumber:</td>
<td>
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="auto-style2">Model:</td>
<td>
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="auto-style2">Department:</td>
<td>
<asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="auto-style2">
<asp:Label ID="DropDownList1" runat="server" Text="Country"></asp:Label>
</td>
<td>
<asp:DropDownList
runat="server"
AutoPostBack="True"
onselectedindexchanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem Text="Select Country" Value="select" Selected="True"></asp:ListItem>
</asp:DropDownList>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
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.OleDb;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
string ConStr = "";
//getting the path of the file
string path = Server.MapPath("Book1.xlsx");
//connection string for that file which extantion is .xlsx
ConStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=\"Excel 12.0;ReadOnly=False;HDR=Yes;\"";
//making query
string query = "INSERT INTO [Sheet1$] ([UserNTID], [SerialNumber], [Model], [Department]) VALUES('" + TextBox1.Text + "','" + TextBox2.Text + "','" + TextBox3.Text + "','" + TextBox4.Text + "')";
query += "SELECT * FROM [Sheet1$]([Country]) VALUES('"+ DropDownList1 + "')";
//Providing connection
OleDbConnection conn = new OleDbConnection(ConStr);
//checking that connection state is closed or not if closed the
//open the connection
if (conn.State == ConnectionState.Closed)
{
conn.Open();
}
//create command object
OleDbCommand cmd = new OleDbCommand(query, conn);
int result = cmd.ExecuteNonQuery();
if (result > 0)
{
Response.Write("<script>alert('Sucessfully Registration!')</script>");
}
else
{
Response.Write("<script>alert('Sorry!\n Register Failed')</script>");
}
conn.Close();
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
}
}
推荐答案
（[UserNTID]，[SerialNumber]，[Model]，[Department]）VALUES（'+ TextBox1.Text +'，'+ TextBox2。 Text +'，'+ TextBox3.Text +'，'+ TextBox4.Text +'）;
query + =SELECT * FROM [Sheet1
([UserNTID], [SerialNumber], [Model], [Department]) VALUES('" + TextBox1.Text + "','" + TextBox2.Text + "','" + TextBox3.Text + "','" + TextBox4.Text + "')"; query += "SELECT * FROM [Sheet1
（[Country]）VALUES（'+ DropDownList1 +'）;
//提供连接
OleDbConnection conn = new OleDbConnection（ConStr）;
//检查连接状态是关闭或不关闭
//打开连接
if（conn.State == ConnectionState.Closed）
{
conn.Open（）;
}
//创建命令对象
OleDbCommand cmd = new OleDbCommand（query，conn）;
int result = cmd.ExecuteNonQuery（）;
if（结果> 0）
{
Response.Write（< script> alert（'Sucessfully Registration！'）< / script>）;
}
其他
{
Response.Write（< script> alert（'抱歉！\ n注册失败'）< / script>）;
}
conn.Close（）;
}
protected void DropDownList1_SelectedIndexChanged（object sender，EventArgs e）
{
}
}
([Country]) VALUES('"+ DropDownList1 + "')"; //Providing connection OleDbConnection conn = new OleDbConnection(ConStr); //checking that connection state is closed or not if closed the //open the connection if (conn.State == ConnectionState.Closed) { conn.Open(); } //create command object OleDbCommand cmd = new OleDbCommand(query, conn); int result = cmd.ExecuteNonQuery(); if (result > 0) { Response.Write("<script>alert('Sucessfully Registration!')</script>"); } else { Response.Write("<script>alert('Sorry!\n Register Failed')</script>"); } conn.Close(); } protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) { } }
虽然我们的问题并不完全清楚，但乍看之下
，你的SELECT查询是错误的。
Although your question is not completely clear to us,
at first glance, yourSELECTquery is wrong.
SELECT * FROM [Sheet1
这篇关于为什么我的下拉列表没有工作？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
