Problème avec BackgroundWorker
Bonjour à tous.
Je code en C# depuis qq semaines seulement et je suis en train de galérer avec les Threads. J'ai lu un peu partout que le composant BackgroundWorker correspondait bien à mes besoins. Seulement il y a un problème : lorsque le calcul en tache de fond est lancé, impossible de clicker sur le boutton annuler qui semble complètement figé. J'ai suivi le tuto http://glarde.developpez.com/dotnet/bgworker/cs/
Je ne vois pas quelle erreur j'ai pu commettre ou ce que j'ai oublié.
Merci de votre aide.
LoadingForm.cs :
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/* Default */
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
/* System */
using System.IO;
namespace NewTestProject
{
public partial class LoadingForm : Form
{
private string Filename;
public LoadingForm(string filename)
{
InitializeComponent();
this.Filename = filename;
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
e.Result = this.LoadFromFile(worker, e);
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
this.progressBar1.Value = e.ProgressPercentage;
}
private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (e.Error != null)
{
MessageBox.Show(e.Error.Message);
this.DialogResult = DialogResult.Abort;
}
else if (e.Cancelled)
{
this.DialogResult = DialogResult.Cancel;
}
else
{
this.DialogResult = DialogResult.OK;
}
}
private void cancelButton_Click(object sender, EventArgs e)
{
this.backgroundWorker1.CancelAsync();
this.cancelButton.Enabled = false;
}
private void LoadingForm_Load(object sender, EventArgs e)
{
this.progressBar1.Value = 0;
//this.backgroundWorker1.RunWorkerAsync();
}
private bool LoadFromFile(BackgroundWorker worker, DoWorkEventArgs e)
{
for (int i = 0; i < 100; i++)
{
if (i == 99)
i = 0;
if (worker.CancellationPending)
{
e.Cancel = true;
return false;
}
else
worker.ReportProgress(i);
}
return false;
}
private void startButton_Click(object sender, EventArgs e)
{
this.backgroundWorker1.RunWorkerAsync();
}
}
} |
LoadingForm.Designer.cs :
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namespace NewTestProject
{
partial class LoadingForm
{
/// <summary>
/// Variable nécessaire au concepteur.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Nettoyage des ressources utilisées.
/// </summary>
/// <param name="disposing">true si les ressources managées doivent être supprimées ; sinon, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Code généré par le Concepteur Windows Form
/// <summary>
/// Méthode requise pour la prise en charge du concepteur - ne modifiez pas
/// le contenu de cette méthode avec l'éditeur de code.
/// </summary>
private void InitializeComponent()
{
this.progressBar1 = new System.Windows.Forms.ProgressBar();
this.cancelButton = new System.Windows.Forms.Button();
this.label1 = new System.Windows.Forms.Label();
this.backgroundWorker1 = new System.ComponentModel.BackgroundWorker();
this.startButton = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// progressBar1
//
this.progressBar1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.progressBar1.Location = new System.Drawing.Point(45, 30);
this.progressBar1.Name = "progressBar1";
this.progressBar1.Size = new System.Drawing.Size(197, 19);
this.progressBar1.Style = System.Windows.Forms.ProgressBarStyle.Continuous;
this.progressBar1.TabIndex = 0;
//
// cancelButton
//
this.cancelButton.Anchor = System.Windows.Forms.AnchorStyles.Bottom;
this.cancelButton.Location = new System.Drawing.Point(104, 74);
this.cancelButton.Name = "cancelButton";
this.cancelButton.Size = new System.Drawing.Size(75, 23);
this.cancelButton.TabIndex = 1;
this.cancelButton.Text = "Cancel";
this.cancelButton.UseVisualStyleBackColor = true;
this.cancelButton.Click += new System.EventHandler(this.cancelButton_Click);
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(42, 14);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(35, 13);
this.label1.TabIndex = 2;
this.label1.Text = "label1";
//
// backgroundWorker1
//
this.backgroundWorker1.WorkerReportsProgress = true;
this.backgroundWorker1.WorkerSupportsCancellation = true;
this.backgroundWorker1.DoWork += new System.ComponentModel.DoWorkEventHandler(this.backgroundWorker1_DoWork);
this.backgroundWorker1.RunWorkerCompleted += new System.ComponentModel.RunWorkerCompletedEventHandler(this.backgroundWorker1_RunWorkerCompleted);
this.backgroundWorker1.ProgressChanged += new System.ComponentModel.ProgressChangedEventHandler(this.backgroundWorker1_ProgressChanged);
//
// startButton
//
this.startButton.Location = new System.Drawing.Point(23, 74);
this.startButton.Name = "startButton";
this.startButton.Size = new System.Drawing.Size(75, 23);
this.startButton.TabIndex = 3;
this.startButton.Text = "Start";
this.startButton.UseVisualStyleBackColor = true;
this.startButton.Click += new System.EventHandler(this.startButton_Click);
//
// LoadingForm
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(292, 109);
this.Controls.Add(this.startButton);
this.Controls.Add(this.label1);
this.Controls.Add(this.cancelButton);
this.Controls.Add(this.progressBar1);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
this.MaximizeBox = false;
this.MinimizeBox = false;
this.Name = "LoadingForm";
this.ShowIcon = false;
this.Text = "Loading";
this.TopMost = true;
this.Load += new System.EventHandler(this.LoadingForm_Load);
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Button cancelButton;
public System.Windows.Forms.ProgressBar progressBar1;
public System.Windows.Forms.Label label1;
private System.ComponentModel.BackgroundWorker backgroundWorker1;
private System.Windows.Forms.Button startButton;
}
} |
