一、BackGroundWorker工作步驟

1.向窗體中拖入一個BackGroundWorker控件。

2.在某個方法或者事件中，調用BackGroundWorker的RunWorkerAsync()方法。

3.該方法為異步操作，將自動引發BackGroundWorker的DoWork事件。

4.調用ReportProgress方法將引發ProgressChanged事件。

二、一個使用了BackGroundWorker的例子

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Threading;
using System.Data.SqlClient;

//該用例需要一個名為bgwTestDB的Sql Server數據庫
//數據庫中應包含tbBgwTest表。
//表中有data1、data2兩列。
//數據庫中還需要一個存儲過程，sql語句如下：
/***************
create procedure insertOneData
@data1 nchar(10),
@data2 int
as
insert into tbBgwTest (data1,data2) values (@data1, @data2)
********************/

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namespace winBackgroundWorkerTest
{
??? public partial class backgroundWorkerTest : Form
??? {
??????? int count = 30;

??????? public backgroundWorkerTest()
??????? {
??????????? InitializeComponent();
??????? }

??????? private void btnAdd_Click(object sender, EventArgs e)
??????? {
??????????? //1.調用bgwInsertData的RunWorkerAsync方法，用來引發DoWork事件
??????????? bgwInsertData.RunWorkerAsync(count);
??????? }

??????? private void bgwInsertData_DoWork(object sender, DoWorkEventArgs e)
??????? {
??????????? BackgroundWorker worker = sender as BackgroundWorker;
??????????? //2.在DoWork中調用自定義函數，并將引發DoWork事件的sender傳遞出去
??????????? insertData(worker);
??????? }

??????? private void bgwInsertData_ProgressChanged(object sender, ProgressChangedEventArgs e)
??????? {
??????????? progressBar1.Value = e.ProgressPercentage;
??????? }

??????? //自定義函數 insertData()
??????? private void insertData(BackgroundWorker worker)
??????? {
??????????? SqlConnection conn = new SqlConnection(@"Data Source=.\sqlexpress;Initial Catalog=bgwTestDB;Integrated Security=True");

??????????? SqlCommand cmd = new SqlCommand("insertOneData", conn);
??????????? cmd.CommandType = CommandType.StoredProcedure;
??????????? cmd.Parameters.Add("data1", SqlDbType.NChar, 10);
??????????? cmd.Parameters.Add("data2", SqlDbType.Int);

??????????? for (int i = 0; i < count; i++)
??????????? {
??????????????? try
??????????????? {
??????????????????? conn.Open();
??????????????????? cmd.Parameters["data1"].Value = i + 1;
??????????????????? cmd.Parameters["data2"].Value = i + 1;
??????????????????? cmd.ExecuteNonQuery();

??????????????????? //3.調用worker的ReportProgress函數，用來引發事件ProgressChanged
??????????????????? worker.ReportProgress(i, worker);
??????????????? }
??????????????? catch(Exception ex)
??????????????? {
??????????????????? MessageBox.Show(ex.Message);
??????????????? }
??????????????? finally
??????????????? {
??????????????????? if (conn.State == ConnectionState.Open)
??????????????????????? conn.Close();
??????????????? }

??????????????? Thread.Sleep(50);
??????????? }
??????? }

??????? private void bgwInsertData_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
??????? {
??????????? if (e.Error != null)
??????????? {
??????????????? MessageBox.Show(e.Error.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
??????????????? return;
??????????? }
??????????? else if (e.Cancelled)
??????????? {
??????????????? MessageBox.Show("取消操作！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
??????????????? return;
??????????? }
??????????? else
??????????????? MessageBox.Show("操作成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
??????? }
??? }
}

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