如何在BackgroundWorker中更新我的数据表中的记录并显示进度

Question

如果单击两次启动后台工作程序的按钮，则会出现此错误。

此BackgroundWorker当前很忙，无法同时运行多个任务

更新记录时如何使它起作用？

这是我的代码

 using (SqlConnection con = new SqlConnection("****"))
        {
            con.Open();


            using (SqlCommand com = new SqlCommand("UPDATE indebtedness SET collected=@collected,Payment_Date=@Payment_Date,Payment_Date2=@Payment_Date2 WHERE Subscriber_No=@Subscriber_No and company_name=@company_name and indebtedness_name=@indebtedness_name ", con))
            {
                com.Parameters.AddWithValue("@company_name", company_name.Text);
                com.Parameters.AddWithValue("@indebtedness_name", indebtedness_name.Text);
                com.Parameters.AddWithValue("@Payment_Date2", DateTime.Today.ToString());
                com.Parameters.Add("@Payment_Date", SqlDbType.Date);
                com.Parameters.Add("@Subscriber_No", SqlDbType.BigInt);
                com.Parameters.Add(new SqlParameter("@collected", SqlDbType.Decimal) { Precision = 18, Scale = 3 });

                int countSuccess = 0;
                for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
                {

                    com.Parameters["@Subscriber_No"].Value = Convert.ToInt64(dataGridView1.Rows[i].Cells[0].Value);
                    com.Parameters["@collected"].Value = Convert.ToDecimal(dataGridView1.Rows[i].Cells[1].Value);
                    com.Parameters["@Payment_Date"].Value = (dataGridView1.Rows[i].Cells[2].Value); //hope this is a date, not a string. If it's a string, parse it instead
                    int numUpd = com.ExecuteNonQuery();
                    countSuccess += numUpd;
                }
                backgroundWorker1.RunWorkerAsync();
                progressBar1.Show();

                MessageBox.Show($"Successfully UPDATED {countSuccess} of {dataGridView1.Rows.Count} rows");

            }
        }

 private void BackgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        for(int i=1; i<=dataGridView1.Rows.Count; i++)
        {
            Thread.Sleep(10);
            backgroundWorker1.WorkerReportsProgress = true;
            backgroundWorker1.ReportProgress(i);
        }
    }

    private void BackgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        progressBar1.Value = e.ProgressPercentage;
        label6.Text = e.ProgressPercentage.ToString() + "%";
        if(label6.Text=="100%")
        {
            label7.Text = "Record UPdated Successfully .. ";
        }
    }

我尝试更新记录并在工作时显示结果是小节

Answer 1

代码看起来像这样：

namespace ConsoleApplication1
{
    public class State
    {
        public List<string> data { get; set; }
    }

    public class MyBackgroundWorker
    {
        public static BackgroundWorker backgroundWorker1 = new BackgroundWorker();

        public void Test()
        {
            State state = new State();
            state.data = new List<string> { "Some Data" };
            int progress = 50;
            backgroundWorker1.ReportProgress(progress, state);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
        }
        private void BackgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            State state = e.UserState as State;
            //add code to write to datatable here
        }
    }
}