backgroundworker TargetInvocationException

xtsixidtf 2010-01-18 10:09:25



int fileLenght;

        int copyNow;



        public Form1()

        {

            InitializeComponent();

        }



        /// <summary>

        /// 数据库备份按钮事件

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        string oldName = "";

        string newName;

        FileStream fs;

        FileStream wf;

        Byte[] buffer;

        int readbytes = 2000;

        private void btnCopy_Click(object sender, EventArgs e)

        {

            

            OpenFileDialog of = new OpenFileDialog();

            if (of.ShowDialog() == DialogResult.OK) oldName = of.FileName;

            newName = @"D:\" + oldName.Substring(oldName.LastIndexOf("\\"));

            using (FileStream fss = new FileStream(oldName, FileMode.Open, FileAccess.Read))

            {

                fileLenght = (int)fss.Length;

            }

            if (File.Exists(newName)) File.Delete(newName);

            fs = new FileStream(oldName, FileMode.Open, FileAccess.Read);

            wf = new FileStream(newName, FileMode.CreateNew, FileAccess.Write);

            buffer = new byte[10240];

            readbytes = 20000;

            this.backgroundWorker1.RunWorkerAsync();

        }



        /// <summary>

        /// 数据库备份

        /// </summary>

        public void CopyFile(BackgroundWorker bk)

        {

            //using (FileStream fs = new FileStream(oldName, FileMode.Open, FileAccess.Read))

            //{

                

            //    FileStream wf = new FileStream(newName, FileMode.CreateNew, FileAccess.Write);

            //    byte[] buffer = new byte[1024];

            //    int readbytes = 2000;

            //    do

            //    {

            //        readbytes = fs.Read(buffer, 0, 1024);

            //        wf.Write(buffer, 0, 1024);

            //        copyNow += readbytes;

            //        bk.ReportProgress(copyNow);

            //    }

            //    while (readbytes >= 1024);

            //}

            

            while (readbytes >= 10240)

            {

                readbytes = fs.Read(buffer, 0, 10240);

                wf.Write(buffer, 0, 10240);

                copyNow += readbytes;

                bk.ReportProgress(copyNow);

            }

        }



        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)

        {

            CopyFile(this.backgroundWorker1);

            e.Cancel = true;

        }



        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)

        {

            this.progressBar1.Maximum = fileLenght;

            this.progressBar1.Value = e.ProgressPercentage;

        }



        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)

        {

            fs.Close();

            wf.Close();

            this.progressBar1.Value = 0;

        }