我正在尝试将数据发送到访问数据库，但它一直给出相同的错误（ExecuteNonQuery：Connection属性尚未初始化），我试图找到相关主题的答案，但我似乎没有看到问题出在哪里，请帮助，谢谢。代码如下：
public static string[] questions = new string[7];
private void SaveData_Load(object sender, EventArgs e)
{
//Selecting data from login
string fileName = @"U:\Projects\Visual Studio\Extras resources\login.xlsx";
string connectionString = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source={0};Extended Properties='Excel 12.0;HDR=YES;IMEX=0'", fileName);
using (OleDbConnection cn = new OleDbConnection(connectionString))
{
try
{
cn.Open();
OleDbCommand command = new OleDbCommand("select * from [lineAudit$]", cn);
using (OleDbDataReader dr = command.ExecuteReader())
{
while (dr.Read())
{
string row1Col0 = Convert.ToString(dr[0]);
string row1cl1 = Convert.ToString(dr[1]);
dateTime_bx.Text = row1Col0;
auditor_bx.Text = row1cl1;
}
}
}
catch (Exception ex)
{
MessageBox.Show("Failed due to" + ex.Message);
}
cn.Close();
}
//Selecting data from datawindow
string fileName2 = @"U:\Projects\Visual Studio\Extras resources\dataWindow.xlsx";
string connectionString2 = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source={0};Extended Properties='Excel 12.0;HDR=YES;IMEX=0'", fileName2);
using (OleDbConnection cn = new OleDbConnection(connectionString2))
{
try
{
cn.Open();
OleDbCommand command = new OleDbCommand("select * from [lineAudit$]", cn);
using (OleDbDataReader dr = command.ExecuteReader())
{
while (dr.Read())
{
string row1Col0 = Convert.ToString(dr[0]);
string row1Col1 = Convert.ToString(dr[1]);
string row1Col2 = Convert.ToString(dr[2]);
string row1Col3 = Convert.ToString(dr[3]);
opId_bx.Text = row1Col0;
shopOrder_bx.Text = row1Col1;
partNumber_bx.Text = row1Col2;
opNumber_bx.Text = row1Col3;
}
}
}
catch (Exception ex)
{
MessageBox.Show("Failed due to" + ex.Message);
}
cn.Close();
}
//Selecting data from documentation
string fileName3 = @"U:\Projects\Visual Studio\Extras resources\documentation.xlsx";
string connectionString3 = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source={0};Extended Properties='Excel 12.0;HDR=YES;IMEX=0'", fileName3);
using (OleDbConnection cn = new OleDbConnection(connectionString3))
{
try
{
cn.Open();
OleDbCommand command = new OleDbCommand("select * from [lineAudit$]", cn);
using (OleDbDataReader dr = command.ExecuteReader())
{
while (dr.Read())
{
string row1Col0 = Convert.ToString(dr[0]);
string row1Col1 = Convert.ToString(dr[1]);
q1_bx.Text = row1Col0;
//boolean to check if string is empty
Documentation doc = new Documentation();
if (a == 2)
{
questions[0] = " Q1- " + row1Col1;
}
else
{
}
}
}
}
catch (Exception ex)
{
MessageBox.Show("Failed due to" + ex.Message);
}
cn.Close();
}
//Selecting data from materials
string fileName4 = @"U:\Projects\Visual Studio\Extras resources\materials.xlsx";
string connectionString4 = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source={0};Extended Properties='Excel 12.0;HDR=YES;IMEX=0'", fileName4);
using (OleDbConnection cn = new OleDbConnection(connectionString4))
{
try
{
cn.Open();
OleDbCommand command = new OleDbCommand("select * from [lineAudit$]", cn);
using (OleDbDataReader dr = command.ExecuteReader())
{
while (dr.Read())
{
string row1Col0 = Convert.ToString(dr[0]);
string row1Col1 = Convert.ToString(dr[1]);
q2_bx.Text = row1Col0;
//boolean to check if string is empty
if (b == 2)
{
questions[1] = " Q2- " + row1Col1;
}
else
{
}
}
}
}
catch (Exception ex)
{
MessageBox.Show("Failed due to" + ex.Message);
}
cn.Close();
}
//Selecting data from procedure
string fileName5 = @"U:\Projects\Visual Studio\Extras resources\comformity.xlsx";
string connectionString5 = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source={0};Extended Properties='Excel 12.0;HDR=YES;IMEX=0'", fileName5);
using (OleDbConnection cn = new OleDbConnection(connectionString5))
{
try
{
cn.Open();
OleDbCommand command = new OleDbCommand("select * from [lineAudit$]", cn);
using (OleDbDataReader dr = command.ExecuteReader())
{
while (dr.Read())
{
string row1Col0 = Convert.ToString(dr[0]);
string row1Col1 = Convert.ToString(dr[1]);
q3_bx.Text = row1Col0;
//boolean to check if string is empty
if (c == 2)
{
questions[2] = " Q3- " + row1Col1;
}
else
{
}
}
}
}
catch (Exception ex)
{
MessageBox.Show("Failed due to" + ex.Message);
}
cn.Close();
}
//Selecting data from No_procedure
string fileName6 = @"U:\Projects\Visual Studio\Extras resources\proceadure.xlsx";
string connectionString6 = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source={0};Extended Properties='Excel 12.0;HDR=YES;IMEX=0'", fileName6);
using (OleDbConnection cn = new OleDbConnection(connectionString6))
{
try
{
cn.Open();
OleDbCommand command = new OleDbCommand("select * from [lineAudit$]", cn);
using (OleDbDataReader dr = command.ExecuteReader())
{
while (dr.Read())
{
string row1Col0 = Convert.ToString(dr[0]);
string row1Col1 = Convert.ToString(dr[1]);
q4_bx.Text = row1Col0;
//boolean to check if string is empty
if (d == 2)
{
questions[3] = " Q4- " + row1Col1;
}
else
{
}
}
}
}
catch (Exception ex)
{
MessageBox.Show("Failed due to" + ex.Message);
}
cn.Close();
}
//Selecting data from calibration
string fileName7 = @"U:\Projects\Visual Studio\Extras resources\calibration.xlsx";
string connectionString7 = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source={0};Extended Properties='Excel 12.0;HDR=YES;IMEX=0'", fileName7);
using (OleDbConnection cn = new OleDbConnection(connectionString5))
{
try
{
cn.Open();
OleDbCommand command = new OleDbCommand("select * from [lineAudit$]", cn);
using (OleDbDataReader dr = command.ExecuteReader())
{
while (dr.Read())
{
string row1Col0 = Convert.ToString(dr[0]);
string row1Col1 = Convert.ToString(dr[1]);
q5_bx.Text = row1Col0;
//boolean to check if string is empty
if (f == 2)
{
questions[4] = " Q5- " + row1Col1;
}
else
{
}
}
}
}
catch (Exception ex)
{
MessageBox.Show("Failed due to" + ex.Message);
}
cn.Close();
}
//Selecting data from safety
string fileName8 = @"U:\Projects\Visual Studio\Extras resources\safety.xlsx";
string connectionString8 = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source={0};Extended Properties='Excel 12.0;HDR=YES;IMEX=0'", fileName8);
using (OleDbConnection cn = new OleDbConnection(connectionString8))
{
try
{
cn.Open();
OleDbCommand command = new OleDbCommand("select * from [lineAudit$]", cn);
using (OleDbDataReader dr = command.ExecuteReader())
{
while (dr.Read())
{
string row1Col0 = Convert.ToString(dr[0]);
string row1Col1 = Convert.ToString(dr[1]);
q6_bx.Text = row1Col0;
//boolean to check if string is empty
if (g == 2)
{
questions[5] = " Q6- " + row1Col1;
}
else
{
}
}
}
}
catch (Exception ex)
{
MessageBox.Show("Failed due to" + ex.Message);
}
cn.Close();
}
//Selecting data from packing
string fileName9 = @"U:\Projects\Visual Studio\Extras resources\packing.xlsx";
string connectionString9 = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source={0};Extended Properties='Excel 12.0;HDR=YES;IMEX=0'", fileName9);
using (OleDbConnection cn = new OleDbConnection(connectionString9))
{
try
{
cn.Open();
OleDbCommand command = new OleDbCommand("select * from [lineAudit$]", cn);
using (OleDbDataReader dr = command.ExecuteReader())
{
while (dr.Read())
{
string row1Col0 = Convert.ToString(dr[0]);
string row1Col1 = Convert.ToString(dr[1]);
q7_bx.Text = row1Col0;
//boolean to check if string is empty
if (h == 2)
{
questions[6] = " Q7- " + row1Col1;
}
else
{
}
}
}
}
catch (Exception ex)
{
MessageBox.Show("Failed due to" + ex.Message);
}
cn.Close();
}
// Call the methods.
string result1 = ConvertStringArrayToString(questions);
noteStr_bx.Text = result1;
}
string ConvertStringArrayToString(string[] questions)
{
// Concatenate all the elements into a StringBuilder.
StringBuilder builder = new StringBuilder();
foreach (string value in questions)
{
builder.Append(value);
builder.Append('.');
}
return builder.ToString();
}
private void BTNSave_Click(object sender, EventArgs e)
{
//sending data to database
OleDbConnection connect = new OleDbConnection();
connect.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0; Data Source=U:\Projects\Visual Studio\Extras resources\line_Audits.accdb";
string QueryText = "INSERT INTO lineAudit (dateTime,auditor,operator,partNumber,shopOrder,operationNumber,documentationAndRevision,labeling,conformity,procedure,calibration,safety,packing,Notes) values (@dateTime,@auditor,@operator,@partNumber,@shopOrder,@operationNumber,@documentationAndRevision,@labeling,@conformity,@procedure,@calibration,@safety,@packing,@Notes)";
connect.Open();
using (OleDbCommand command = new OleDbCommand(QueryText))
{
try
{
OleDbDataAdapter da = new OleDbDataAdapter("INSERT INTO lineAudit", connect);
String dateTime = dateTime_bx.Text;
String auditor = auditor_bx.Text;
String operador = opId_bx.Text;
String partNumber = partNumber_bx.Text;
String shopOrder = shopOrder_bx.Text;
String operationNumber = opNumber_bx.Text;
String q1 = q1_bx.Text;
String q2 = q2_bx.Text;
String q3 = q3_bx.Text;
String q4 = q4_bx.Text;
String q5 = q5_bx.Text;
String q6 = q6_bx.Text;
String q7 = q7_bx.Text;
String note = noteStr_bx.Text;
command.Parameters.AddWithValue("@dateTime", this.dateTime_bx.Text);
command.Parameters.AddWithValue("@auditor", this.auditor_bx.Text);
command.Parameters.AddWithValue("@operator", this.opId_bx.Text);
command.Parameters.AddWithValue("@partNumber", this.partNumber_bx.Text);
command.Parameters.AddWithValue("@shopOrder", this.shopOrder_bx.Text);
command.Parameters.AddWithValue("@operationNumber", this.opNumber_bx.Text);
command.Parameters.AddWithValue("@documentationAndRevision", this.q1_bx.Text);
command.Parameters.AddWithValue("@labeling", this.q2_bx.Text);
command.Parameters.AddWithValue("@conformity", this.q3_bx.Text);
command.Parameters.AddWithValue("@procedure", this.q4_bx.Text);
command.Parameters.AddWithValue("@calibration", this.q5_bx.Text);
command.Parameters.AddWithValue("@safety", this.q6_bx.Text);
command.Parameters.AddWithValue("@packing", this.q7_bx.Text);
command.Parameters.AddWithValue("@Notes", this.noteStr_bx.Text);
command.ExecuteNonQuery();
//connect.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
connect.Close();
}
}
}
private void dateTime_bx_TextChanged(object sender, EventArgs e)
{
}
}
}
答案 0 :(得分：1)
告诉你的OleDbCommand在QueryText之后使用什么连接 而不是：
using (OleDbCommand command = new OleDbCommand(QueryText))
使用：
using (OleDbCommand command = new OleDbCommand(QueryText, connect))
答案 1 :(得分：0)
这样的事情对你有用。
using ExcelToAccessLib;
using System;
using System.IO;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
private string AccessFile = Path.Combine(
AppDomain.CurrentDomain.BaseDirectory, "Database1.accdb");
private string ExcelFile = Path.Combine(
AppDomain.CurrentDomain.BaseDirectory, "Customers.xlsx");
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Importer ImportData =
new Importer(
new ExcelInfo
{
FileName = ExcelFile,
HasHeaders = true,
SheetName = "Customers"
},
new AccessInfo
{
FileName = AccessFile,
TableName = "Customers1",
FieldNames = "CompanyName,ContactName"
});
if (ImportData.Run())
{
MessageBox.Show("Import complete");
}
}
}
}