当我将数据导出到excel时，代码在某种程度上起作用它工作正常但是如果我再次导入数据时返回应用程序并添加，删除或更新任何数据网格，它不会导出变化。我删除了原始的csv文件，以防它被覆盖问题但仍然遇到同样的问题。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.IO;
namespace WindowsFormsApplication1
{
public partial class FormAccounts : Form
{
String constring = @"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\kenny\Documents\Visual Studio 2010\Projects\Cegees 181013\WindowsFormsApplication1\WindowsFormsApplication1\Accounts.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
//String cmdselect = @"select * Accounts";
String cmdupdate = @"update Accounts set date = @date, moneyin = @moneyin, retailin = @retailin, rent = @rent, stock = @stock, transport = @transport, misc = @misc, bills = @bills, comments = @comments where ID = @id";
String cmdinsert = @"insert into Accounts (date, moneyin, retailin, rent, stock, transport, misc, bills, comments) values (@date, @moneyin, @retailin, @rent, @stock, @transport, @misc, @bills, @comments )";
String cmddelete = @"delete from Accounts where ID =@ID";
public FormAccounts()
{
InitializeComponent();
}
private void FormAccounts_Load(object sender, EventArgs e)
{
// TODO: This line of code loads data into the 'accountsDataSet.Accounts' table. You can move, or remove it, as needed.
this.accountsTableAdapter.Fill(this.accountsDataSet.Accounts);
}
private void btnAdd_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(constring);
SqlDataAdapter da = new SqlDataAdapter();
da.InsertCommand = new SqlCommand(cmdinsert, con);
try
{
da.InsertCommand.Parameters.Add("@date", SqlDbType.Date);
da.InsertCommand.Parameters["@date"].Value = dtpaccs.Value;
da.InsertCommand.Parameters.Add("@moneyin", SqlDbType.Decimal);
da.InsertCommand.Parameters["@moneyin"].Value = textmoneyin.Text ;
da.InsertCommand.Parameters.Add("@retailin", SqlDbType.Decimal);
da.InsertCommand.Parameters["@retailin"].Value = textretailin.Text;
da.InsertCommand.Parameters.Add("@rent", SqlDbType.Decimal);
da.InsertCommand.Parameters["@rent"].Value = textrent.Text;
da.InsertCommand.Parameters.Add("@stock", SqlDbType.Decimal);
da.InsertCommand.Parameters["@stock"].Value = textstock.Text;
da.InsertCommand.Parameters.Add("@transport", SqlDbType.Decimal);
da.InsertCommand.Parameters["@transport"].Value = texttransport.Text;
da.InsertCommand.Parameters.Add("@misc", SqlDbType.Decimal);
da.InsertCommand.Parameters["@misc"].Value = textmisc.Text;
da.InsertCommand.Parameters.Add("@bills", SqlDbType.Decimal);
da.InsertCommand.Parameters["@bills"].Value = textbills.Text;
da.InsertCommand.Parameters.Add("@comments", SqlDbType.VarChar);
da.InsertCommand.Parameters["@comments"].Value = textcomments.Text;
con.Open();
da.InsertCommand.ExecuteNonQuery();
MessageBox.Show("Data Added");
con.Close();
cleartexts();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
string date = dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString();
string id = dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
lbldate.Text = date;
lblID.Text = id;
dtpaccs.Value = Convert.ToDateTime(date);
textmoneyin.Text = dataGridView1.Rows[e.RowIndex].Cells[2].Value.ToString();
textretailin.Text = dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString();
textrent.Text = dataGridView1.Rows[e.RowIndex].Cells[4].Value.ToString();
textstock.Text = dataGridView1.Rows[e.RowIndex].Cells[5].Value.ToString();
texttransport.Text = dataGridView1.Rows[e.RowIndex].Cells[6].Value.ToString();
textmisc.Text = dataGridView1.Rows[e.RowIndex].Cells[7].Value.ToString();
textbills.Text = dataGridView1.Rows[e.RowIndex].Cells[8].Value.ToString();
textcomments.Text = dataGridView1.Rows[e.RowIndex].Cells[9].Value.ToString();
}
private void btnEdit_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(constring);
SqlDataAdapter da = new SqlDataAdapter();
da.UpdateCommand = new SqlCommand(cmdupdate, con);
try
{
da.UpdateCommand.Parameters.Add("@ID", SqlDbType.Int).Value = lblID.Text;
da.UpdateCommand.Parameters.Add("@date", SqlDbType.Date).Value = lbldate.Text;
da.UpdateCommand.Parameters.Add("@moneyin", SqlDbType.Decimal).Value = textmoneyin.Text;
da.UpdateCommand.Parameters.Add("@retailin", SqlDbType.Decimal).Value = textretailin.Text;
da.UpdateCommand.Parameters.Add("@rent", SqlDbType.Decimal).Value = textrent.Text;
da.UpdateCommand.Parameters.Add("@stock", SqlDbType.Decimal).Value = textstock.Text;
da.UpdateCommand.Parameters.Add("@transport", SqlDbType.Decimal).Value = texttransport.Text;
da.UpdateCommand.Parameters.Add("@misc", SqlDbType.Decimal).Value = textmisc.Text;
da.UpdateCommand.Parameters.Add("@bills", SqlDbType.Decimal).Value = textbills.Text;
da.UpdateCommand.Parameters.Add("@comments", SqlDbType.VarChar).Value = textcomments.Text;
con.Open();
da.UpdateCommand.ExecuteNonQuery();
MessageBox.Show("Accounts Updated");
con.Close();
cleartexts();
}
catch(Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
private void btnDelete_Click(object sender, EventArgs e)
{
var rindex = dataGridView1.SelectedCells[0].RowIndex;
SqlConnection con = new SqlConnection(constring);
SqlDataAdapter da = new SqlDataAdapter();
da.DeleteCommand = new SqlCommand(cmddelete, con);
try
{
DialogResult dr;
dr = MessageBox.Show("Are you sure you want to delete this record", "Confirmation", MessageBoxButtons.YesNo);
if (dr == DialogResult.Yes)
{
da.DeleteCommand.Parameters.Add("@ID", SqlDbType.Int).Value = accountsDataSet.Accounts[rindex].ID;
con.Open();
da.DeleteCommand.ExecuteNonQuery();
MessageBox.Show("Record Deleted");
con.Close();
cleartexts();
}
else
{
MessageBox.Show("Delete Cancelled");
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
public void cleartexts()
{
//Clears textboxes
textmoneyin.Text = "";
textretailin.Text ="";
textrent.Text = "";
textstock.Text = "";
texttransport.Text = "";
textmisc.Text = "";
textbills.Text = "";
textcomments.Text = "";
}
private void exportToolStripMenuItem_Click(object sender, EventArgs e)
{
int cols;
string directory = @"C:\Users\kenny\Documents\Visual Studio 2010\Projects\Cegees 181013\WindowsFormsApplication1\WindowsFormsApplication1\Excel Exports";
string filename = string.Format("{0:dd-MM-yy}__{1}.csv", DateTime.Now, "Accounts");
string path = Path.Combine(directory, filename);
//open file
using (StreamWriter wr = File.CreateText(path))
{
//determine the number of cols and write to file
cols = dataGridView1.Columns.Count;
for (int i = 0; i < cols; i++)
{
wr.Write(dataGridView1.Columns[i].Name.ToString().ToUpper() + ",");
}
wr.WriteLine();
//write rows to excel
for (int i = 0; i < (dataGridView1.Rows.Count - 1); i++)
{
for (int j = 0; j < cols; j++)
{
if (dataGridView1.Rows[i].Cells[j].Value != null)
{
wr.Write(dataGridView1.Rows[i].Cells[j].Value + ",");
}
else
{
wr.Write(",");
}
}
wr.WriteLine();
}
wr.Close();
MessageBox.Show("Operation Complete " +path);
}
}
}
}
答案 0 :(得分：0)
发现问题。需要关闭并重新启动应用程序才能复制新数据。一旦数据网格被更改/更新，有没有办法做到这一点？