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POMultithreading in a windows form with Multple instances of the form running in parallel
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  1. POMultithreading in a windows form with Multple instances of the form running in parallel
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    copied!<p>I have this project in which i am calling a web service, receiving rates from the web service, processing it and displaying it in appropriate text boxes,</p> <p>As you can guess the waiting for response from web service, and processing is too much work on a single thread, and the app gets unresponsive every once in a while so i had to use multi-theading to make the app more responsive. I am naive to multi-threading and i did something like this: a thread that makes the webservice calls:</p> <pre><code>Webservicethread = new Thread(() =&gt; RefreshRates(marketId1)); Webservicethread.Start(); </code></pre> <p>this thread in turn calls another thread to do the heavy processing part:</p> <pre><code>t = new Thread(() =&gt; fillData(response.Length - 1, response)); t.Start(); </code></pre> <p>The problem is that this form is supposed to have a no. of instances running in parallel at the same time, which was working fine untill i tried to apply multithreading in my form,</p> <p>now that i have tried to multithread it, running a second or a third instance heavily effects the working of all other instances of the app, and it totally freezes after i open the third instance.</p> <p>I am totally confused what could possibly be done, some1 please help me out here.....:/</p> <p>the filldata() method extracts the rates from the webservice response and fills them in the respective textboxes</p> <p>*EDIT</p> <p>here is my complete code, sorry as it gets too lengthy....</p> <p>As suggested by Aaleksey, i profiled my code with ANTS profiler, filldata() is consuming even more time than th webservice call.</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using BetRates_NS.com.betfair.api; using BetRates_NS.BFExchangeService; using System.Net; using System.Threading; namespace BetRates_NS { public partial class Rates : Form { public Rates() { InitializeComponent(); } Thread t; Thread Webservicethread; private BFGlobalService bfg1 = new BFGlobalService(); private BFExchangeService.BFExchangeService bfg2 = new BetRates_NS.BFExchangeService.BFExchangeService(); int marketId1 = 0; public int MarketId1 { get { return marketId1; } set { marketId1 = value; } } string match_name=""; public string Match_name { get { return match_name; } set { match_name = value; } } string match_date = ""; public string Match_date { get { return match_date; } set { match_date = value; } } string sessionToken = ""; public string SessionToken { get { return sessionToken; } set { sessionToken = value; } } int max_len = 0; public int Max_len { get { return max_len; } set { max_len = value; } } bool inPlay=false; protected override bool ShowWithoutActivation { get { return true; } } public void ClearTextBoxes(Control control) { foreach (Control c in control.Controls) { if (c is TextBox) { ((TextBox)c).Clear(); } if (c.HasChildren) { ClearTextBoxes(c); } } } private void RefreshRates(int marketid_temp) { try { //ClearTextBoxes(this); BFExchangeService.APIRequestHeader header2 = new BetRates_NS.BFExchangeService.APIRequestHeader(); header2.clientStamp = 0; header2.sessionToken = sessionToken; //**************************** GET PRICES **************************** GetMarketPricesCompressedReq price_req1 = new GetMarketPricesCompressedReq(); price_req1.header = header2; price_req1.marketId = marketId1; price_req1.currencyCode = "GBP"; GetMarketPricesCompressedResp price_resp = new GetMarketPricesCompressedResp(); price_resp = bfg2.getMarketPricesCompressed(price_req1); string prices = price_resp.marketPrices; string[] Parts = prices.Split(':'); is_InPlay(Parts[0]); t = new Thread(() =&gt; fillData(Parts.Length - 1, Parts)); t.Start(); //fillData(Parts.Length - 1, Parts); } catch (Exception ep) { //MessageBox.Show(ep.Message); } } private void is_InPlay(string temp) { string[] check = temp.Split('~'); if (Convert.ToInt32(check[3]) != 0) { inPlay = true; pictureBox2.Visible = true; ToolTip t1 = new ToolTip(); t1.SetToolTip(this.pictureBox2, "InPlay"); } else { inPlay = false; pictureBox2.Visible = false; } } private void Rates_Load(object sender, EventArgs e) { this.Text = match_name; //lbl_match.Text = match_name; BFExchangeService.APIRequestHeader header2 = new BetRates_NS.BFExchangeService.APIRequestHeader(); header2.clientStamp = 0; header2.sessionToken = sessionToken; GetMarketReq market_req1 = new GetMarketReq(); market_req1.header = header2; market_req1.marketId = Convert.ToInt32(marketId1); GetMarketResp market_resp1= bfg2.getMarket(market_req1); Market market1 = market_resp1.market; Runner[] runners_list = market1.runners; makeMyRows(runners_list.Length); this.Height=60+(36*runners_list.Length); int max_length = 0; for (int i = 0; i &lt; runners_list.Length; i++) { if (max_length &lt; runners_list[i].name.Length) { max_length = runners_list[i].name.Length; } int label_counter = i + 1; string ctrl_name = "lbl" + label_counter.ToString(); Label temp = null; foreach (Control ctl in this.Controls) { if ((ctl is Label) &amp;&amp; (ctl.Name == ctrl_name)) { temp = (Label)ctl; } } if (temp != null) { temp.Text = runners_list[i].name; } } //max_len = max_length; //MessageBox.Show(max_len.ToString()); System.Windows.Forms.Timer myTimer = new System.Windows.Forms.Timer(); myTimer.Interval = 200; myTimer.Tick += new EventHandler(myTimer_Tick); myTimer.Enabled = true; this.Focus(); if (this.VerticalScroll.Visible == true) { this.Width = this.Width + 24; } } private void myTimer_Tick(object sender, EventArgs e) { Webservicethread = new Thread(() =&gt; RefreshRates(marketId1)); Webservicethread.Start(); //RefreshRates(marketId1); } private void button1_Click(object sender, EventArgs e) { } private void button1_Click_1(object sender, EventArgs e) { this.Refresh(); this.RefreshRates(marketId1); } private void groupBox1_Enter(object sender, EventArgs e) { } //public delegate void FillData1(int count1, string[] parts1); private void fillData(int count,string[] Parts) { for (int i = 1; i &lt;= count; i++) { string[] subParts = Parts[i].Split('|'); for (int j = 1; j &lt;= subParts.Length-1; j++) { string[] Fields = subParts[j].Split('~'); for (int k = 1; k &lt;= 6; k++) { string compare_txt = ""; string ctrl_name = "txt" + i.ToString() + k.ToString(); TextBox temp = null;// = (TextBox)findCtrl(ctrl_name); foreach (Control ctl in this.Controls) { if ((ctl is TextBox) &amp;&amp; (ctl.Name == ctrl_name)) { temp = (TextBox)ctl; } } if (j == 1) { switch (k) { case 1: compare_txt = temp.Text; //temp.Text = ""; temp.Invoke(new AddText1(AddText), new object[] { ctrl_name, "" }); if (Fields.Length &gt;= 9) { if (!string.IsNullOrEmpty(Fields[8])) { this.Invoke(new AddText1(AddText), new object[] { ctrl_name, Fields[8] }); //temp.Text = Fields[8]; } } if (Fields.Length &gt;= 10) { if (!string.IsNullOrEmpty(Fields[9])) { this.Invoke(new AddText1(AddText), new object[] { ctrl_name, temp.Text + "\r\n£" + Fields[9] }); //temp.Text = temp.Text + "\r\n£" + Fields[9]; } } if (temp.Text != compare_txt)//check if value has changed, if yes blink { temp.BackColor = Color.LightGreen; } else { temp.BackColor = Color.Lavender; } break; case 2: compare_txt = temp.Text; this.Invoke(new AddText1(AddText), new object[] { ctrl_name, "" }); //temp.Text = ""; if (Fields.Length &gt;= 5) { if (!string.IsNullOrEmpty(Fields[4])) { this.Invoke(new AddText1(AddText), new object[] { ctrl_name, Fields[4] }); //temp.Text = Fields[4]; } } if (Fields.Length &gt;= 6) { if (!string.IsNullOrEmpty(Fields[5])) { this.Invoke(new AddText1(AddText), new object[] { ctrl_name, temp.Text + "\r\n£" + Fields[5] }); //temp.Text = temp.Text + "\r\n£" + Fields[5]; } } if (temp.Text == compare_txt) { temp.BackColor = Color.Thistle; } else { temp.BackColor = Color.LightGreen; } break; case 3: compare_txt = temp.Text; this.Invoke(new AddText1(AddText), new object[] { ctrl_name, "" }); //temp.Text = ""; if (Fields.Length &gt;= 1) { if (!string.IsNullOrEmpty(Fields[0])) { this.Invoke(new AddText1(AddText), new object[] { ctrl_name, Fields[0] }); //temp.Text = Fields[0]; } } if (Fields.Length &gt;= 2) { if (!string.IsNullOrEmpty(Fields[1])) { this.Invoke(new AddText1(AddText), new object[] { ctrl_name, temp.Text + "\r\n£" + Fields[1] }); //temp.Text = temp.Text + "\r\n£" + Fields[1]; } } if (temp.Text == compare_txt) { temp.BackColor = Color.FromArgb(192, 192, 255); } else { temp.BackColor = Color.LightGreen; } break; } } else if (j == 2) { switch (k) { case 4: compare_txt = temp.Text; this.Invoke(new AddText1(AddText), new object[] { ctrl_name, "" }); //temp.Text = ""; if (Fields.Length &gt;= 1) { if (!string.IsNullOrEmpty(Fields[0])) { this.Invoke(new AddText1(AddText), new object[] { ctrl_name, Fields[0] }); //temp.Text = Fields[0]; } } if (Fields.Length &gt;= 2) { if (!string.IsNullOrEmpty(Fields[1])) { this.Invoke(new AddText1(AddText), new object[] { ctrl_name, temp.Text + "\r\n£" + Fields[1] }); //temp.Text = temp.Text + "\r\n£" + Fields[1]; } } if (temp.Text == compare_txt) { temp.BackColor = Color.FromArgb(255, 192, 192); } else { temp.BackColor = Color.LightGreen; } break; case 5: compare_txt = temp.Text; this.Invoke(new AddText1(AddText), new object[] { ctrl_name, "" }); //temp.Text = ""; if (Fields.Length &gt;= 5) { if (!string.IsNullOrEmpty(Fields[4])) { this.Invoke(new AddText1(AddText), new object[] { ctrl_name, Fields[4] }); //temp.Text = Fields[4]; } } if (Fields.Length &gt;= 6) { if (!string.IsNullOrEmpty(Fields[5])) { this.Invoke(new AddText1(AddText), new object[] { ctrl_name, temp.Text + "\r\n£" + Fields[5] }); //temp.Text = temp.Text + "\r\n£" + Fields[5]; } } if (temp.Text == compare_txt) { temp.BackColor = Color.MistyRose; } else { temp.BackColor = Color.LightGreen; } break; case 6: compare_txt = temp.Text; this.Invoke(new AddText1(AddText), new object[] { ctrl_name, "" }); //temp.Text = ""; if (Fields.Length &gt;= 9) { if (!string.IsNullOrEmpty(Fields[8])) { this.Invoke(new AddText1(AddText), new object[] { ctrl_name, Fields[8] }); //temp.Text = Fields[8]; } } if (Fields.Length &gt;= 10) { if (!string.IsNullOrEmpty(Fields[9])) { this.Invoke(new AddText1(AddText), new object[] { ctrl_name, temp.Text + "\r\n£" + Fields[9] }); //temp.Text = temp.Text + "\r\n£" + Fields[9]; } } if (temp.Text == compare_txt) { temp.BackColor = Color.Lavender; } else { temp.BackColor = Color.LightGreen; } break; } } } } } } public delegate void AddText1(string ctrl_n, string text_a); private void AddText(string ctrl_name, string text_assign) { TextBox temp = null;// = (TextBox)findCtrl(ctrl_name); foreach (Control ctl in this.Controls) { if ((ctl is TextBox) &amp;&amp; (ctl.Name == ctrl_name)) { temp = (TextBox)ctl; } } temp.Text = text_assign; } private void makeMyRows(int count) { int X = 10, Y = 23; for (int i = 1; i &lt;= count; i++) { Label label = new Label(); label.Name = "lbl" + i.ToString(); label.Location = new Point(X, Y); label.BackColor = Color.Transparent; label.Font=new Font("Calibri Sans-Serif", 10); label.Font = new Font(label.Font, FontStyle.Bold); label.ForeColor = Color.White; this.Controls.Add(label); X = X + 118; for (int j = 1; j &lt;= 6; j++) { TextBox tb = new TextBox(); tb.Name = "txt" + i.ToString() + j.ToString(); tb.ReadOnly = true; tb.Location = new Point(X,Y); tb.Size = new Size(55, 30); tb.Font = new System.Drawing.Font("Arial, Helvetica, sans-serif", (float)7.5); tb.TextAlign = HorizontalAlignment.Center; tb.BorderStyle = BorderStyle.FixedSingle; tb.Font = new Font(tb.Font, FontStyle.Regular); tb.Multiline = true; switch (j) { case 1: tb.BackColor = Color.Lavender; break; case 2: tb.BackColor = Color.Thistle; break; case 3: tb.BackColor = Color.FromArgb(192, 192, 255); break; case 4: tb.BackColor = Color.FromArgb(255, 192, 192); break; case 5: tb.BackColor = Color.MistyRose; break; case 6: tb.BackColor = Color.Lavender; break; } this.Controls.Add(tb); X = X + 61; } X = 10; Y = Y + 36; } } //************preventing flicker************* int originalExStyle = -1; bool enableFormLevelDoubleBuffering = true; protected override CreateParams CreateParams { get { if (originalExStyle == -1) originalExStyle = base.CreateParams.ExStyle; CreateParams cp = base.CreateParams; if (enableFormLevelDoubleBuffering) cp.ExStyle |= 0x02000000; // WS_EX_COMPOSITED else cp.ExStyle = originalExStyle; return cp; } } private void TurnOffFormLevelDoubleBuffering() { enableFormLevelDoubleBuffering = false; this.MaximizeBox = true; } private void Rates_Shown(object sender, EventArgs e) { TurnOffFormLevelDoubleBuffering(); } //****************************************** private void pictureBox2_Click(object sender, EventArgs e) { } private void pictureBox1_Click(object sender, EventArgs e) { this.Refresh(); RefreshRates(marketId1); } private void pictureBox1_MouseLeave(object sender, EventArgs e) { pictureBox1.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.Refresh1)); } private void pictureBox1_MouseEnter(object sender, EventArgs e) { pictureBox1.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.Refresh_hover)); } private void Rates_FormClosing(object sender, FormClosingEventArgs e) { t.Abort(); Webservicethread.Abort(); } } } </code></pre>
 

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