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POShould i use Lock if i add files to my Listbox via threads?
 

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  1. POShould i use Lock if i add files to my Listbox via threads?
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    <p>my application contain Listbox that i am add files into and when i do it with Add folder it check all the files inside this folder and do it by open different thread on each file and then add those files into the Listbox - so should i use lock to prevent case that 2 (or more) files will try to add file at same time ?</p> <pre><code>private void btnAddDir_Click_1(object sender, EventArgs e) { int totalCount = 0; int count = 0; string fileToAdd = string.Empty; List&lt;string&gt; filesList = new List&lt;string&gt;(); BackgroundWorker backgroundWorker = null; DialogResult dialog = folderBrowserDialog1.ShowDialog(); if (dialog == DialogResult.OK) { btnAddfiles.Enabled = false; btnAddDir.Enabled = false; btnPlay.Enabled = false; Editcap editcap = new Editcap(); foreach (string file in SafeFileEnumerator.EnumerateFiles(folderBrowserDialog1.SelectedPath, "*.*", SearchOption.AllDirectories)) { if (editcap.isWiresharkFormat(file)) { filesList.Add(file); totalCount++; } } backgroundWorker = new BackgroundWorker(); backgroundWorker.WorkerReportsProgress = true; backgroundWorker.DoWork += (s1, e1) =&gt; { foreach (string fileName in filesList) { if (editcap.isWiresharkFormat(fileName)) { if (editcap.isLibpcapFormat(fileName)) { backgroundWorker.ReportProgress(0, fileName); count++; } else if (!editcap.isLibpcapFormat(fileName)) { fileToAdd = editcap.getNewFileName(fileName); if (new FileInfo(fileToAdd).Exists) { backgroundWorker.ReportProgress(0, fileToAdd); count++; } } this.Invoke((MethodInvoker)delegate { labelStatus.Text = string.Format("Please wait..({0}/{1} files were added)", count.ToString("#,##0"), totalCount.ToString("#,##0")); if(listBoxFiles.Items.Count != 0) listBoxFiles.SetSelected(listBoxFiles.Items.Count - 1, true); }); } } }; backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler( (s1, e1) =&gt; { }); backgroundWorker.ProgressChanged += (s1, arguments) =&gt; { listBoxFiles.Items.Add(arguments.UserState); }; backgroundWorker.RunWorkerAsync(); } } </code></pre>
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    1. USuser1269592
    1. USuser1269592
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    1. COYou cant access a UI control from a seperate thread anyway. Not sure why you would try. Whats the reasoning behind it?
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      1. POShould i use Lock if i add files to my Listbox via threads?
      1. USSteve
    2. COCan you post your code on how you are using multiple threads to access your files and your UI control at the same time?
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      1. POShould i use Lock if i add files to my Listbox via threads?
      1. USryadavilli
    3. COsee my update..
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      1. POShould i use Lock if i add files to my Listbox via threads?
      1. USuser1269592
 

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