即使在使用背景工作者时，如何将UI置于冻结状态？ [英] How do I top the UI from freezing even when I'm using a backgroundworker ?

问题描述

大家好！



我在使用backgroundworker时遇到了问题。简单地说，我尝试显示随机图像和一个小时钟告诉自从我运行的应用程序。当我尝试添加一些套接字代码以向客户端套接字发送特定值时，问题就出现了。

它只需要太长时间，在此期间，我的用户界面冻结大约一分钟左右。我看了，有些人告诉我尝试使用背景工作者。

我没有得到我做错事但没有真正改变的地方。我的应用程序仍然冻结并持续相同的时间。这是我的代码。有人看到这个问题吗？什么，我在做错了什么？非常感谢!!



我的尝试：



< pre lang =c＃> 使用 Npgsql;
使用系统;
使用 System.Collections.Generic;
使用 System.ComponentModel;
使用 System.Data;
使用 System.Drawing;
使用 System.Linq;
使用 System.Text;
使用 System.Net.Sockets;
使用 System.Threading;
使用 System.Threading.Tasks;
使用 System.Windows.Forms;

命名空间 ImageRandomizeforSenseIt
{
public partial class ImageRandomize：Form
{
// 如何处理没有控制框的表单移动
public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;

[System.Runtime.InteropServices.DllImportAttribute（ user32.dll ）]
public static extern int SendMessage（ IntPtr hWnd， int Msg， int wParam， int lParam）;
[System.Runtime.InteropServices.DllImportAttribute（ user32.dll）]
public static extern bool ReleaseCapture（）;
// 结束如何处理没有控制框的表单移动

// 声明&初始化
// string answer = string.Format（{0：D2} h： {1：D2} m：{2：D2} s：{3：D3} ms，t.Hours，t.Minutes，t.Seconds，t.Milliseconds）;
public int duration = 0 ;

public List List_Hours_To_Check = new List {};
public int NextIndex = -1;
public int affiche = 0 ;

/ * 首次亮相区域套接字* /
TcpListener ServerSocket = new TcpListener（System.Net.IPAddress.Any， 8888 ）;
int requestCount = 0 ;
TcpClient ClientSocket = 默认（TcpClient）;
/ * fin zone socket * /

/ * * /
BackgroundWorker bw = new BackgroundWorker（）;
/ * * /

public ImageRandomize（）
{
InitializeComponent（）;
this .BackColor = Color.FromArgb（ 57 ， 57 ， 60 ）;

var start = DateTime.Today;
var nbparjour =（ 24 * 60 ）/ ImageRandomizeforSenseIt.Properties.Settings.Default.DelaiChangementEnMn;
var clockQuery = 来自 offset Enumerable.Range（ 0 ，nbparjour）
select start.AddMinutes（ImageRandomizeforSenseIt.Properties .Settings.Default.DelaiChangementEnMn * offset）;
foreach （ var time in clockQuery）
List_Hours_To_Check.Add（time.ToString（ HH：mm）） ;

LabelTotal.Text = XX：XX;

/ * * /
// bw.DoWork + = Bw_DoWork;
// 要报告后台工作人员的进度，我们需要设置此属性
bw.WorkerReportsProgress = false ;
// 当工人启动时，将在工作线程上引发此事件
bw.DoWork + = new DoWorkEventHandler（Bw_DoWork）;
/ * * /

ServerSocket.Start（）;
}

// 做背景工作
private void Bw_DoWork（ object sender ，DoWorkEventArgs e）
{
// string [] param = e.Argument as string [ ];
string ee;

// 处理长期运行的任务
尝试
{
if （ServerSocket.Pending（）== true ）
{
ClientSocket = ServerSocket.AcceptTcpClient（）;
requestCount = requestCount + 1 ;

NetworkStream networkStream = ClientSocket.GetStream（）;

byte [] bytesFrom = new byte [（ int ）ClientSocket.ReceiveBufferSize];
networkStream.Read（bytesFrom， 0 ，（ int ）ClientSocket.ReceiveBufferSize）;

string dataFromClient = System.Text.Encoding.ASCII.GetString（bytesFrom）;
dataFromClient = dataFromClient.Substring（ 0 ，dataFromClient.IndexOf（ $））;

string serverResponse = List_Hours_To_Check [NextIndex];
字节 [] sendBytes = Encoding.ASCII.GetBytes（serverResponse）;

networkStream.Write（sendBytes， 0 ，sendBytes.Length）;
networkStream.Flush（）;

ClientSocket.Close（）;
}
}
catch （InvalidOperationException ex）
{
ee = ex.Message;
// MessageBox.Show（ex.Message，Application.ProductName，MessageBoxButtons.OK，MessageBoxIcon.Error） ;
}
catch （SocketException ex）
{
ee = ex.Message;
}
catch （例外情况）
{
ee = ex.Message;
}

// e.Result = null; //设置长时间运行任务的结果
}

private void Send_Something_Complete（）
{
try
{
if （ServerSocket.Pending（）== true ）
{
ClientSocket = ServerSocket.AcceptTcpClient（）;
requestCount = requestCount + 1 ;

NetworkStream networkStream = ClientSocket.GetStream（）;

byte [] bytesFrom = new byte [（ int ）ClientSocket.ReceiveBufferSize];
networkStream.Read（bytesFrom， 0 ，（ int ）ClientSocket.ReceiveBufferSize）;

string dataFromClient = System.Text.Encoding.ASCII.GetString（bytesFrom）;
dataFromClient = dataFromClient.Substring（ 0 ，dataFromClient.IndexOf（ $））;

string serverResponse = List_Hours_To_Check [NextIndex];
字节 [] sendBytes = Encoding.ASCII.GetBytes（serverResponse）;

networkStream.Write（sendBytes， 0 ，sendBytes.Length）;
networkStream.Flush（）;

ClientSocket.Close（）;
}
}
catch （InvalidOperationException ex）
{
// MessageBox.Show（ex.Message，Application.ProductName，MessageBoxButtons.OK，MessageBoxIcon.Error）;
}
catch （SocketException ex）
{
// MessageBox.Show（ex.Message，Application.ProductName，MessageBoxButtons.OK，MessageBoxIcon.Error）;
}
catch （Exception ex）
{
// MessageBox.Show（ex。消息，Application.ProductName，MessageBoxButtons.OK，MessageBoxIcon.Error）;
}
}

private void Timer_Duration_Tick（ object sender，EventArgs e）
{
duration = duration + Timer_Duration.Interval;
// TimeSpan t = TimeSpan.FromMilliseconds（duration）;
// LabelDuration.Text = string.Format（{0：D2}：{1：D2}：{2：D2} ，t.Hours，t.Minutes，t.Seconds）;

TimeSpan t = TimeSpan.FromMilliseconds（duration）;
LabelDuration.Text = string .Format（ {0：D2}：{1：D2}：{2：D2}，
t.Hours，
t.Minutes，
t.Seconds）;

var TM = DateTime.Now.ToString（ HH：MM）;

if （（（（List_Hours_To_Check.FindIndex（x = > x == TM）！= -1））
||（（List_Hours_To_Check.FindIndex（x = > x == TM）== -1） &&（picToZoom.Image == null ）））
&&（affiche == 0 ））
{
NextIndex = List_Hours_To_Check.FindIndex（x = > x == TM）+ 1 ;
affiche = 1 ;
Module.Current_Image_To_Be_Annotated_Path = Module.Get_Random_Image_To_Be_Annotated_Path（）;
Module.Auto_Size_Image（Image.FromFile（Module.Current_Image_To_Be_Annotated_Path），picToZoom，PictureBoxSizeMode.Zoom）;
// SaveImage（）;
}
else if （（List_Hours_To_Check.FindIndex（x = > x == TM）== -1）&&（picToZoom.Image！= null ））
{
布尔 NextFound = false ;
affiche = 0 ;
while （NextFound == false ）
{
var TN = DateTime.Now.AddMinutes（ 1 ）。ToString（ HH：mm）;

if （List_Hours_To_Check.FindIndex（x = > x == TN ）！= -1）
{
NextFound = true ;
NextIndex = List_Hours_To_Check.FindIndex（x = > x == TN）;
}
else
{
NextFound = false ;
}
}
}

LabelTotal.Text = List_Hours_To_Check [NextIndex];

// Send_Something_Complete（）;
}

private void SaveImage（）
{
// 保存所选图片
string Query_S = String .Empty;
列表listevaleurs = new List {};

Query_S =
INSERT INTO image_affichee（image_en_cours，heure_image_suivante） +
values（@ a，@ b）;;

listevaleurs.Add（Module.Current_Image_To_Be_Annotated_Path）;
listevaleurs.Add（LabelTotal.Text）;

NpgsqlConnection Connection = Module.Connexion（）;
NpgsqlTransaction事务;

Connection.Open（）; if （！（Connection.State == ConnectionState.Open））{Connection.Open（）; }

Transaction = Connection.BeginTransaction（）;
NpgsqlCommand MaCommande = new NpgsqlCommand（Query_S，Connection，Transaction）;

尝试
{
MaCommande.Parameters.Add（ @ a，listevaleurs [ 0 ]）;
MaCommande.Parameters.Add（ @ b，listevaleurs [ 1 ]）;
MaCommande.ExecuteNonQuery（）;

Transaction.Commit（）;
}
catch （NpgsqlException ex）
{
MessageBox.Show（（ 错误 +（ex.ErrorSql +（ ： + ex.Message）））， 错误，MessageBoxButtons.OK，MessageBoxIcon.Error）;
Transaction.Rollback（）;
}

if （（Transaction == null ）） {Connection.Close（）; }
}

private void ImageRandomize_MouseDown（ object sender，MouseEventArgs e）
{
if （e.Button == MouseButtons.Left）
{
ReleaseCapture（）;
SendMessage（句柄，WM_NCLBUTTONDOWN，HT_CAPTION， 0 ）;
}
}

私有 void ImageRandomize_Load（ object sender，EventArgs e）
{
// 将事件添加到表单
此 .MouseDown + = ImageRandomize_MouseDown;

Timer_Duration.Start（）;
}

私有 void ImageRandomize_DoubleClick（ object sender，EventArgs e）
{
this .WindowState = FormWindowState.Minimized;
}

private void ImageRandomize_FormClosing（ object sender，FormClosingEventArgs e）
{
ServerSocket.Stop（）;
}

私有 void ImageRandomize_Shown（ object sender，EventArgs e）
{
bw.RunWorkerAsync（）;
}

}
}

解决方案

）） ;

string serverResponse = List_Hours_To_Check [NextIndex];
Byte [] sendBytes = Encoding.ASCII.GetBytes（serverResponse）;

networkStream.Write（sendBytes， 0 ，sendBytes.Length）;
networkStream.Flush（）;

ClientSocket.Close（）;
}
}
catch （InvalidOperationException ex）
{
ee = ex.Message;
// MessageBox.Show（ex.Message，Application.ProductName，MessageBoxButtons.OK，MessageBoxIcon.Error）;
}
catch （SocketException ex）
{
ee = ex.Message;
}
catch （例外情况）
{
ee = ex.Message;
}

// e.Result = null; //设置长时间运行任务的结果
}

private void Send_Something_Complete（）
{
try
{
if （ServerSocket.Pending（）== true ）
{
ClientSocket = ServerSocket.AcceptTcpClient（）;
requestCount = requestCount + 1 ;

NetworkStream networkStream = ClientSocket.GetStream（）;

byte [] bytesFrom = new byte [（ int ）ClientSocket.ReceiveBufferSize];
networkStream.Read（bytesFrom， 0 ，（ int ）ClientSocket.ReceiveBufferSize）;

string dataFromClient = System.Text.Encoding.ASCII.GetString（bytesFrom）;
dataFromClient = dataFromClient.Substring（ 0 ，dataFromClient.IndexOf（

））;

string serverResponse = List_Hours_To_Check [NextIndex];
字节 [] sendBytes = Encoding.ASCII.GetBytes（serverResponse）;

networkStream.Write（sendBytes， 0 ，sendBytes.Length）;
networkStream.Flush（）;

ClientSocket.Close（）;
}
}
catch （InvalidOperationException ex）
{
// MessageBox.Show（ex.Message，Application.ProductName，MessageBoxButtons.OK，MessageBoxIcon.Error）;
}
catch （SocketException ex）
{
// MessageBox.Show（ex.Message，Application.ProductName，MessageBoxButtons.OK，MessageBoxIcon.Error）;
}
catch （Exception ex）
{
// MessageBox.Show（ex。消息，Application.ProductName，MessageBoxButtons.OK，MessageBoxIcon.Error）;
}
}

private void Timer_Duration_Tick（ object sender，EventArgs e）
{
duration = duration + Timer_Duration.Interval;
// TimeSpan t = TimeSpan.FromMilliseconds（duration）;
// LabelDuration.Text = string.Format（{0：D2}：{1：D2}：{2：D2} ，t.Hours，t.Minutes，t.Seconds）;

TimeSpan t = TimeSpan.FromMilliseconds（duration）;
LabelDuration.Text = string .Format（ {0：D2}：{1：D2}：{2：D2}，
t.Hours，
t.Minutes，
t.Seconds）;

var TM = DateTime.Now.ToString（ HH：MM）;

if （（（（List_Hours_To_Check.FindIndex（x = > x == TM）！= -1））
||（（List_Hours_To_Check.FindIndex（x = > x == TM）== -1） &&（picToZoom.Image == null ）））
&&（affiche == 0 ））
{
NextIndex = List_Hours_To_Check.FindIndex（x = > x == TM）+ 1 ;
affiche = 1 ;
Module.Current_Image_To_Be_Annotated_Path = Module.Get_Random_Image_To_Be_Annotated_Path（）;
Module.Auto_Size_Image（Image.FromFile（Module.Current_Image_To_Be_Annotated_Path），picToZoom，PictureBoxSizeMode.Zoom）;
// SaveImage（）;
}
else if （（List_Hours_To_Check.FindIndex（x = > x == TM）== -1）&&（picToZoom.Image！= null ））
{
布尔 NextFound = false ;
affiche = 0 ;
while （NextFound == false ）
{
var TN = DateTime.Now.AddMinutes（ 1 ）。ToString（ HH：mm）;

if （List_Hours_To_Check.FindIndex（x = > x == TN ）！= -1）
{
NextFound = true ;
NextIndex = List_Hours_To_Check.FindIndex（x = > x == TN）;
}
else
{
NextFound = false ;
}
}
}

LabelTotal.Text = List_Hours_To_Check [NextIndex];

// Send_Something_Complete（）;
}

private void SaveImage（）
{
// 保存所选图片
string Query_S = String .Empty;
列表listevaleurs = new List {};

Query_S =
INSERT INTO image_affichee（image_en_cours，heure_image_suivante） +
values（@ a，@ b）;;

listevaleurs.Add（Module.Current_Image_To_Be_Annotated_Path）;
listevaleurs.Add（LabelTotal.Text）;

NpgsqlConnection Connection = Module.Connexion（）;
NpgsqlTransaction事务;

Connection.Open（）; if （！（Connection.State == ConnectionState.Open））{Connection.Open（）; }

Transaction = Connection.BeginTransaction（）;
NpgsqlCommand MaCommande = new NpgsqlCommand（Query_S，Connection，Transaction）;

尝试
{
MaCommande.Parameters.Add（ @ a，listevaleurs [ 0 ]）;
MaCommande.Parameters.Add（ @ b，listevaleurs [ 1 ]）;
MaCommande.ExecuteNonQuery（）;

Transaction.Commit（）;
}
catch (NpgsqlException ex)
{
MessageBox.Show((\"Error \" + (ex.ErrorSql + (\" has occurred: \" + ex.Message))), \"Error\", MessageBoxButtons.OK, MessageBoxIcon.Error);
Transaction.Rollback();
}

if ((Transaction == null)) { Connection.Close(); }
}

private void ImageRandomize_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
ReleaseCapture();
SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
}
}

private void ImageRandomize_Load(object sender, EventArgs e)
{
// Adding the events to Form
this.MouseDown += ImageRandomize_MouseDown;

Timer_Duration.Start();
}

private void ImageRandomize_DoubleClick(object sender, EventArgs e)
{
this.WindowState = FormWindowState.Minimized;
}

private void ImageRandomize_FormClosing(object sender, FormClosingEventArgs e)
{
ServerSocket.Stop();
}

private void ImageRandomize_Shown(object sender, EventArgs e)
{
bw.RunWorkerAsync();
}

}
}

Hi everyone !!



I’ve come t an answer. The first problem was in my code, not the backgroundworker.



this part especially was the guilty one.

Boolean NextFound = false; 
                 affiche = 0; 
                 while (NextFound == false) 
                 { 
                     var TN = DateTime.Now.AddMinutes(1).ToString(\"HH:mm\"); 
  
                     if (List_Hours_To_Check.FindIndex(x => x == TN) != -1) 
                     { 
                         NextFound = true; 
                         NextIndex = List_Hours_To_Check.FindIndex(x => x == TN); 
                     } 
                     else 
                     { 
                         NextFound = false; 
                     } 
                 }

I fixed it and i use thread now. Everything is working smoothly. Thank you !!

Hi everyone !!

I have a problem using the backgroundworker thing. Simply put i try to show random images and a little clock telling since when the app i running. The problem start when I try to add some socket code to send a certain value to clients sockets.
It just takes too long and during that time, my UI freezes for approximatively one minute or so. I read and some people told me to try using a backgroundworker.
I don't get where I'm doing something bad but nothing really changed. My app still freezes and for the same amount of time. Here is my code. Is anyone seeing the problem ? What and here am I doing wrong ? Thanks a lot !!

What I have tried:

using Npgsql;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ImageRandomizeforSenseIt
{
    public partial class ImageRandomize : Form
    {
        // How to deal with form moving without controlbox
        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HT_CAPTION = 0x2;

        [System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
        [System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
        public static extern bool ReleaseCapture();
        // End How to deal with form moving without controlbox 
        
        // Declarations & Initialisations
        //string answer = string.Format("{0:D2}h:{1:D2}m:{2:D2}s:{3:D3}ms", t.Hours, t.Minutes, t.Seconds, t.Milliseconds);
        public int duration = 0;

        public List List_Hours_To_Check = new List { };
        public int NextIndex = -1;
        public int affiche = 0;
        
        /*    debut zone socket     */
            TcpListener ServerSocket = new TcpListener(System.Net.IPAddress.Any, 8888) ;
            int requestCount = 0;
            TcpClient ClientSocket = default(TcpClient);
        /*    fin zone socket     */

        /**/
            BackgroundWorker bw = new BackgroundWorker();
        /**/

        public ImageRandomize()
        {
            InitializeComponent();
            this.BackColor = Color.FromArgb(57, 57, 60);

            var start = DateTime.Today;
            var nbparjour = (24 * 60) / ImageRandomizeforSenseIt.Properties.Settings.Default.DelaiChangementEnMn;
            var clockQuery = from offset in Enumerable.Range(0, nbparjour)
                             select start.AddMinutes(ImageRandomizeforSenseIt.Properties.Settings.Default.DelaiChangementEnMn * offset);
            foreach (var time in clockQuery)
                List_Hours_To_Check.Add(time.ToString("HH:mm"));

            LabelTotal.Text = "XX : XX";

            /**/
                //bw.DoWork += Bw_DoWork;
            // To report progress from the background worker we need to set this property
            bw.WorkerReportsProgress = false;
            // This event will be raised on the worker thread when the worker starts
            bw.DoWork += new DoWorkEventHandler(Bw_DoWork);
            /**/

            ServerSocket.Start();
        }

        //Do your Background-Work
        private void Bw_DoWork(object sender, DoWorkEventArgs e)
        {
            //string[] param = e.Argument as string[];
            string ee;
 
            //Process your long running  task
            try
            {
                if (ServerSocket.Pending() == true)
                {
                    ClientSocket = ServerSocket.AcceptTcpClient();
                    requestCount = requestCount + 1;

                    NetworkStream networkStream = ClientSocket.GetStream();

                    byte[] bytesFrom = new byte[(int)ClientSocket.ReceiveBufferSize];
                    networkStream.Read(bytesFrom, 0, (int)ClientSocket.ReceiveBufferSize);

                    string dataFromClient = System.Text.Encoding.ASCII.GetString(bytesFrom);
                    dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$"));

                    string serverResponse = List_Hours_To_Check[NextIndex];
                    Byte[] sendBytes = Encoding.ASCII.GetBytes(serverResponse);

                    networkStream.Write(sendBytes, 0, sendBytes.Length);
                    networkStream.Flush();

                    ClientSocket.Close();
                }
            }
            catch (InvalidOperationException ex)
            {
                ee = ex.Message; 
                //MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            catch (SocketException ex)
            {
                ee = ex.Message;
            }
            catch (Exception ex)
            {
                ee = ex.Message;
            }

            //e.Result = null; //Set your Result of the long running task
        }

        private void Send_Something_Complete()
        {
            try
            {
                if (ServerSocket.Pending() == true)
                {
                    ClientSocket = ServerSocket.AcceptTcpClient();
                    requestCount = requestCount + 1;

                    NetworkStream networkStream = ClientSocket.GetStream();

                    byte[] bytesFrom = new byte[(int)ClientSocket.ReceiveBufferSize];
                    networkStream.Read(bytesFrom, 0, (int)ClientSocket.ReceiveBufferSize);

                    string dataFromClient = System.Text.Encoding.ASCII.GetString(bytesFrom);
                    dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$"));

                    string serverResponse = List_Hours_To_Check[NextIndex];
                    Byte[] sendBytes = Encoding.ASCII.GetBytes(serverResponse);

                    networkStream.Write(sendBytes, 0, sendBytes.Length);
                    networkStream.Flush();

                    ClientSocket.Close();
                }
            }
            catch (InvalidOperationException ex)
            {
                //MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            catch (SocketException ex)
            {
                //MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            catch (Exception ex)
            {
                //MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        
        private void Timer_Duration_Tick(object sender, EventArgs e)
        {            
            duration = duration + Timer_Duration.Interval;
            //TimeSpan t = TimeSpan.FromMilliseconds(duration);
            //LabelDuration.Text = string.Format("{0:D2} : {1:D2} : {2:D2}",t.Hours, t.Minutes, t.Seconds);

            TimeSpan t = TimeSpan.FromMilliseconds(duration);
            LabelDuration.Text = string.Format("{0:D2} : {1:D2} : {2:D2}",
                                                    t.Hours,
                                                    t.Minutes,
                                                    t.Seconds);

            var TM = DateTime.Now.ToString("HH:mm");

            if ((((List_Hours_To_Check.FindIndex(x => x == TM) != -1))
                || ((List_Hours_To_Check.FindIndex(x => x == TM) == -1) && (picToZoom.Image == null)))
                && (affiche == 0))
            {
                NextIndex = List_Hours_To_Check.FindIndex(x => x == TM) + 1;
                affiche = 1;
                Module.Current_Image_To_Be_Annotated_Path = Module.Get_Random_Image_To_Be_Annotated_Path();
                Module.Auto_Size_Image(Image.FromFile(Module.Current_Image_To_Be_Annotated_Path), picToZoom, PictureBoxSizeMode.Zoom);
                //SaveImage();
            }
            else if ((List_Hours_To_Check.FindIndex(x => x == TM) == -1) && (picToZoom.Image != null))
            {
                Boolean NextFound = false;
                affiche = 0;
                while (NextFound == false)
                {
                    var TN = DateTime.Now.AddMinutes(1).ToString("HH:mm");

                    if (List_Hours_To_Check.FindIndex(x => x == TN) != -1)
                    {
                        NextFound = true;
                        NextIndex = List_Hours_To_Check.FindIndex(x => x == TN);
                    }
                    else
                    {
                        NextFound = false;
                    }
                }
            }

            LabelTotal.Text = List_Hours_To_Check[NextIndex];
            
            //Send_Something_Complete(); 
        }

        private void SaveImage()
        {
            // Save the selected image
            string Query_S = String.Empty;
            List listevaleurs = new List { };

            Query_S =
            "INSERT INTO image_affichee (image_en_cours, heure_image_suivante) " +
                "values (@a, @b);";

            listevaleurs.Add(Module.Current_Image_To_Be_Annotated_Path);
            listevaleurs.Add(LabelTotal.Text);

            NpgsqlConnection Connection = Module.Connexion();
            NpgsqlTransaction Transaction;

            Connection.Open(); if (!(Connection.State == ConnectionState.Open)) { Connection.Open(); }

            Transaction = Connection.BeginTransaction();
            NpgsqlCommand MaCommande = new NpgsqlCommand(Query_S, Connection, Transaction);

            try
            {
                MaCommande.Parameters.Add("@a", listevaleurs[0]);
                MaCommande.Parameters.Add("@b", listevaleurs[1]);
                MaCommande.ExecuteNonQuery();

                Transaction.Commit();
            }
            catch (NpgsqlException ex)
            {
                MessageBox.Show(("Error " + (ex.ErrorSql + (" has occurred: " + ex.Message))), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                Transaction.Rollback();
            }

            if ((Transaction == null)) { Connection.Close(); }
        }        
                
        private void ImageRandomize_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
            }
        }
        
        private void ImageRandomize_Load(object sender, EventArgs e)
        {
            // Adding the events to Form
            this.MouseDown += ImageRandomize_MouseDown;

            Timer_Duration.Start();
        }
        
        private void ImageRandomize_DoubleClick(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Minimized; 
        }

        private void ImageRandomize_FormClosing(object sender, FormClosingEventArgs e)
        {
            ServerSocket.Stop();
        }

        private void ImageRandomize_Shown(object sender, EventArgs e)
        {
            bw.RunWorkerAsync();
        }
        
    }
}

解决方案

")); string serverResponse = List_Hours_To_Check[NextIndex]; Byte[] sendBytes = Encoding.ASCII.GetBytes(serverResponse); networkStream.Write(sendBytes, 0, sendBytes.Length); networkStream.Flush(); ClientSocket.Close(); } } catch (InvalidOperationException ex) { ee = ex.Message; //MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error); } catch (SocketException ex) { ee = ex.Message; } catch (Exception ex) { ee = ex.Message; } //e.Result = null; //Set your Result of the long running task } private void Send_Something_Complete() { try { if (ServerSocket.Pending() == true) { ClientSocket = ServerSocket.AcceptTcpClient(); requestCount = requestCount + 1; NetworkStream networkStream = ClientSocket.GetStream(); byte[] bytesFrom = new byte[(int)ClientSocket.ReceiveBufferSize]; networkStream.Read(bytesFrom, 0, (int)ClientSocket.ReceiveBufferSize); string dataFromClient = System.Text.Encoding.ASCII.GetString(bytesFrom); dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("

")); string serverResponse = List_Hours_To_Check[NextIndex]; Byte[] sendBytes = Encoding.ASCII.GetBytes(serverResponse); networkStream.Write(sendBytes, 0, sendBytes.Length); networkStream.Flush(); ClientSocket.Close(); } } catch (InvalidOperationException ex) { //MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error); } catch (SocketException ex) { //MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error); } catch (Exception ex) { //MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error); } } private void Timer_Duration_Tick(object sender, EventArgs e) { duration = duration + Timer_Duration.Interval; //TimeSpan t = TimeSpan.FromMilliseconds(duration); //LabelDuration.Text = string.Format("{0:D2} : {1:D2} : {2:D2}",t.Hours, t.Minutes, t.Seconds); TimeSpan t = TimeSpan.FromMilliseconds(duration); LabelDuration.Text = string.Format("{0:D2} : {1:D2} : {2:D2}", t.Hours, t.Minutes, t.Seconds); var TM = DateTime.Now.ToString("HH:mm"); if ((((List_Hours_To_Check.FindIndex(x => x == TM) != -1)) || ((List_Hours_To_Check.FindIndex(x => x == TM) == -1) && (picToZoom.Image == null))) && (affiche == 0)) { NextIndex = List_Hours_To_Check.FindIndex(x => x == TM) + 1; affiche = 1; Module.Current_Image_To_Be_Annotated_Path = Module.Get_Random_Image_To_Be_Annotated_Path(); Module.Auto_Size_Image(Image.FromFile(Module.Current_Image_To_Be_Annotated_Path), picToZoom, PictureBoxSizeMode.Zoom); //SaveImage(); } else if ((List_Hours_To_Check.FindIndex(x => x == TM) == -1) && (picToZoom.Image != null)) { Boolean NextFound = false; affiche = 0; while (NextFound == false) { var TN = DateTime.Now.AddMinutes(1).ToString("HH:mm"); if (List_Hours_To_Check.FindIndex(x => x == TN) != -1) { NextFound = true; NextIndex = List_Hours_To_Check.FindIndex(x => x == TN); } else { NextFound = false; } } } LabelTotal.Text = List_Hours_To_Check[NextIndex]; //Send_Something_Complete(); } private void SaveImage() { // Save the selected image string Query_S = String.Empty; List listevaleurs = new List { }; Query_S = "INSERT INTO image_affichee (image_en_cours, heure_image_suivante) " + "values (@a, @b);"; listevaleurs.Add(Module.Current_Image_To_Be_Annotated_Path); listevaleurs.Add(LabelTotal.Text); NpgsqlConnection Connection = Module.Connexion(); NpgsqlTransaction Transaction; Connection.Open(); if (!(Connection.State == ConnectionState.Open)) { Connection.Open(); } Transaction = Connection.BeginTransaction(); NpgsqlCommand MaCommande = new NpgsqlCommand(Query_S, Connection, Transaction); try { MaCommande.Parameters.Add("@a", listevaleurs[0]); MaCommande.Parameters.Add("@b", listevaleurs[1]); MaCommande.ExecuteNonQuery(); Transaction.Commit(); } catch (NpgsqlException ex) { MessageBox.Show(("Error " + (ex.ErrorSql + (" has occurred: " + ex.Message))), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); Transaction.Rollback(); } if ((Transaction == null)) { Connection.Close(); } } private void ImageRandomize_MouseDown(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { ReleaseCapture(); SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0); } } private void ImageRandomize_Load(object sender, EventArgs e) { // Adding the events to Form this.MouseDown += ImageRandomize_MouseDown; Timer_Duration.Start(); } private void ImageRandomize_DoubleClick(object sender, EventArgs e) { this.WindowState = FormWindowState.Minimized; } private void ImageRandomize_FormClosing(object sender, FormClosingEventArgs e) { ServerSocket.Stop(); } private void ImageRandomize_Shown(object sender, EventArgs e) { bw.RunWorkerAsync(); } } }

Hi everyone !!

I've come t an answer. The first problem was in my code, not the backgroundworker.

this part especially was the guilty one.

Boolean NextFound = false;
                affiche = 0;
                while (NextFound == false)
                {
                    var TN = DateTime.Now.AddMinutes(1).ToString("HH:mm");

                    if (List_Hours_To_Check.FindIndex(x => x == TN) != -1)
                    {
                        NextFound = true;
                        NextIndex = List_Hours_To_Check.FindIndex(x => x == TN);
                    }
                    else
                    {
                        NextFound = false;
                    }
                }

I fixed it and i use thread now. Everything is working smoothly. Thank you !!

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