Background worker

using System;

using System.ComponentModel;

using System.Windows.Forms;

using ESRI.ArcGIS.ADF;

using ESRI.ArcGIS.Geodatabase;

 

//Author: Domenico Ciavarella

//www.studioat.it

namespace Studioat.ArcEngine.Forms

{

    public partial class frmBW : Form

    {

 

        BackgroundWorker backGroundWorker = null;

        enum operation { start, stop };

        public IFeatureClass FeatureClass

        {

            get;

            set;

        }

 

 

        #region Ctor

        public frmBW()

        {

            InitializeComponent();

 

        }

 

        public frmBW(IFeatureClass featureClass):this()

        {

 

 

            FeatureClass = featureClass;

 

 

        }

        #endregion Ctor

 

        private void btnStart_Click(object sender, EventArgs e)

        {

 

            Operation(operation.start);

            RunWorker();

 

 

        }

        private void btnStop_Click(object sender, EventArgs e)

        {

 

            backGroundWorker.CancelAsync();

 

 

        }

 

        #region private method

        void Operation(operation op)

        {

 

            btnStart.Enabled = (op == operation.stop);

            btnStop.Enabled = (op == operation.start);

            InitializeProgressBar();

        }

        void InitializeProgressBar()

        {

            progressBar.Maximum = 100;

            progressBar.Minimum = 0;

            progressBar.Value = 0;

        }

        void RunWorker()

        {

 

           backGroundWorker = new BackgroundWorker();

           backGroundWorker.WorkerReportsProgress = true;

           backGroundWorker.WorkerSupportsCancellation = true;

           backGroundWorker.DoWork += new DoWorkEventHandler(doWork);

           backGroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(runWorkerCompleted);

           backGroundWorker.ProgressChanged += new ProgressChangedEventHandler(progressChanged);

           backGroundWorker.RunWorkerAsync(FeatureClass);

 

        }

        #endregion private method

 

        #region BackgroundWorker

        void doWork(object sender, DoWorkEventArgs e) {

 

                BackgroundWorker senderWorker = sender as BackgroundWorker;

 

                IFeatureClass featureClass = e.Argument as IFeatureClass;

                int featureCount = featureClass.FeatureCount(null);

 

                IFeatureCursor featureCursor = featureClass.Search(null, true);

                IFeature feature = featureCursor.NextFeature();

 

                int i = 0;

                while (feature != null)

                {

 

                    //////////////////////////////////////

                    //////////////here your work

                    //System.Threading.Thread.Sleep(1000);

                    //////////////////////////////////////

 

                    ++i;

                    int progressInPercent = (int)(((decimal)(i) / (decimal)featureCount) * 100);

 

                    backGroundWorker.ReportProgress(progressInPercent, feature.OID);

 

 

 

 

 

                    if(senderWorker.CancellationPending) {

 

                        e.Cancel = true;

 

                        break;

 

                    }

 

                    feature = featureCursor.NextFeature();

 

                }

 

                ComReleaser.ReleaseCOMObject(featureCursor);

 

            }

        void runWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)

        {

 

 

 

                if (e.Cancelled)

                   lblStatus.Text = "work was cancelled.";

                else

                   lblStatus.Text = "work finished processing request.";

 

                Operation(operation.stop);

 

        }

        void progressChanged(object sender, ProgressChangedEventArgs e) {

 

            progressBar.Value = e.ProgressPercentage;

 

            lblStatus.Text = string.Format("working on OID of: {0}",e.UserState);

 

        }

        #endregion

 

 

 

    }

}

Qui puoi scaricare la soluzione in VS2008 MapControlBW