无效的跨线程访问Backgroundworker错误C# [英] Invalid cross thread access backgroundworker error c#
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问题描述
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.OleDb;
using System.Threading;
namespace SRS
{
public partial class excelimport : Form
{
public excelimport()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog openfiledialog1 = new OpenFileDialog();
if (openfiledialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
this.textBox1.Text = openfiledialog1.FileName;
}
}
private void button2_Click(object sender, EventArgs e)
{
if ( backgroundWorker1.IsBusy != true)
{
backgroundWorker1.RunWorkerAsync();
}
}
DataTable mysource;
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
for (int i = 1; (i <= 10); i++)
{
if ((worker.CancellationPending == true))
{
e.Cancel = true;
break;
}
else
{
string pathconn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source= " + textBox1.Text + " ;Extended Properties=\"Excel 12.0 Xml;HDR=YES;\";";
OleDbConnection conn = new OleDbConnection(pathconn);
OleDbDataAdapter mydatapter = new OleDbDataAdapter("select * from [" + textBox2.Text + "$]", conn);
DataTable dt = new DataTable();
mydatapter.Fill(dt);
datagridview1.datasource=dt;
System.Threading.Thread.Sleep(500);
worker.ReportProgress((i * 10));
}
}
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
this.tbprogress.Text = (e.ProgressPercentage.ToString() + "%");
}
private delegate void tododelegate();
private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if ((e.Cancelled == true))
{
this.tbprogress.Text = "Canceled!";
}
else if (!(e.Error == null))
{
this.tbprogress.Text = ("Error: " + e.Error.Message);
}
else
{
this.tbprogress.Text = "Done!";
}
}
private void excelimport_Load(object sender, EventArgs e)
{
}
}
}
我在行中收到错误消息:
I get the error message in line :
datagridview1.datasource = dt;
datagridview1.datasource=dt;
我试图更改这样的代码:
I tried to alter the code like this :
private DataTable loadingtable()
{
string pathconn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source= " + textBox1.Text + " ;Extended Properties=\"Excel 12.0 Xml;HDR=YES;\";";
OleDbConnection conn = new OleDbConnection(pathconn);
OleDbDataAdapter mydatapter = new OleDbDataAdapter("select * from [" + textBox2.Text + "$]", conn);
DataTable dt = new DataTable();
mydatapter.Fill(dt);
return dt;
}
以及在加载事件中dataGridView1.DataSource = mysource;
and in load event dataGridView1.DataSource = mysource;
以及在bw worker中,mysource = loadingtable();
and in bw worker mysource =loadingtable();
然后就没有错误,但是加载数据需要花费很多时间.
and then there is no error but then load data takes forever.
推荐答案
您无法在非UI线程上更新UI控件.
You can't update UI controls on a non-UI thread.
尝试一下:
datagridview1.Invoke(() => datagridview1.datasource = dt);
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