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POElegant Log Window in WinForms C#
 

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    <p><strong>I am looking for ideas on an efficient way to implement a log window for a windows forms application. In the past I have implemented several using TextBox and RichTextBox but I am still not totally satisfied with the functionality.</strong></p> <p>This log is intended to provide the user with a recent history of various events, primarily used in data-gathering applications where one might be curious how a particular transaction completed. In this case, the log need not be permanent nor saved to a file.</p> <p>First, some proposed requirements:</p> <ul> <li>Efficient and fast; if hundreds of lines are written to the log in quick succession, it needs to consume minimal resources and time.</li> <li>Be able to offer a variable scrollback of up to 2000 lines or so. Anything longer is unnecessary.</li> <li>Highlighting and color are preferred. Font effects not required.</li> <li>Automatically trim lines as the scrollback limit is reached.</li> <li>Automatically scroll as new data is added.</li> <li>Bonus but not required: Pause auto-scrolling during manual interaction such as if the user is browsing the history.</li> </ul> <p>What I have been using so far to write and trim the log:</p> <p>I use the following code (which I call from other threads):</p> <pre><code>// rtbLog is a RichTextBox // _MaxLines is an int public void AppendLog(string s, Color c, bool bNewLine) { if (rtbLog.InvokeRequired) { object[] args = { s, c, bNewLine }; rtbLog.Invoke(new AppendLogDel(AppendLog), args); return; } try { rtbLog.SelectionColor = c; rtbLog.AppendText(s); if (bNewLine) rtbLog.AppendText(Environment.NewLine); TrimLog(); rtbLog.SelectionStart = rtbLog.TextLength; rtbLog.ScrollToCaret(); rtbLog.Update(); } catch (Exception exc) { // exception handling } } private void TrimLog() { try { // Extra lines as buffer to save time if (rtbLog.Lines.Length &lt; _MaxLines + 10) { return; } else { string[] sTemp = rtxtLog.Lines; string[] sNew= new string[_MaxLines]; int iLineOffset = sTemp.Length - _MaxLines; for (int n = 0; n &lt; _MaxLines; n++) { sNew[n] = sTemp[iLineOffset]; iLineOffset++; } rtbLog.Lines = sNew; } } catch (Exception exc) { // exception handling } } </code></pre> <p>The problem with this approach is that whenever TrimLog is called, I lose color formatting. With a regular TextBox this works just fine (with a bit of modification of course).</p> <p>Searches for a solution to this have never been really satisfactory. Some suggest to trim the excess by character count instead of line count in a RichTextBox. I've also seen ListBoxes used, but haven't successfully tried it.</p>
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    1. COThat and I've had the experience of RTF causing crashes with thread synchronization that SyncLock was unable to prevent when I needed it at the time. +1
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      1. USBrett Allen
 

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