How To Create Error Log Files In Asp.net
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Install by Heath Stewart Application Lifecycle Management Application Insights Release Management Team Foundation Server Testing Visual Studio Team Services All Languages Visual C++ Visual F# JavaScript TypeScript Python .NET .NET .NET with Beth Massi ASP.NET by Scott Hanselman OData Team WPF Platform Development Apps for Windows Bing Edge Microsoft Azure Office 365 Development Web Data Development SQL Server SQL Server Data Tools DocumentDB C# Frequently Asked Questions The C# team posts answers to common questions and describes new language features How can I easily log a message to a file for debugging purposes? ★★★★★★★★★★★★★★★ March https://www.asp.net/web-forms/overview/getting-started/getting-started-with-aspnet-45-web-forms/aspnet-error-handling 27, 2006August 5, 2015 by CSharpFAQ // 13 Comments 0 0 0 Often, you need a way to monitor your applications once they are running on the server or even at the customer site -- away from your Visual Studio debugger. In those situations, it is often helpful to have a simple routine that you can use to log messages to a text file for later https://blogs.msdn.microsoft.com/csharpfaq/2006/03/27/how-can-i-easily-log-a-message-to-a-file-for-debugging-purposes/ analysis. Here’s a simple routine that has helped me a lot for example when writing server applications without an user interface: using System.IO; public string GetTempPath() { string path = System.Environment.GetEnvironmentVariable("TEMP"); if (!path.EndsWith("\\")) path += "\\"; return path; } public void LogMessageToFile(string msg) { System.IO.StreamWriter sw = System.IO.File.AppendText( GetTempPath() + "My Log File.txt"); try { string logLine = System.String.Format( "{0:G}: {1}.", System.DateTime.Now, msg); sw.WriteLine(logLine); } finally { sw.Close(); } } With this simple method, all you need to do is to pass in a string like this: LogMessageToFile("Hello, World"); The current date and time are automatically inserted to the log file along with your message. [author: Jani Järvinen, C# MVP] Back totop Search this blog Search all blogs Share This PostShareShareShareShareShare Recent Posts New C# T-Shirt Designs on the .NET Blog - Tell Us What You Think May 21, 2015 Roslyn ships v1.0-rc2 with "Go-Live" license May 1, 2015 A Journey Through Open Source: The Trials & Triumphs in Roslyn's First Year of Open Source April 6, 2015 Edit & Continue and Make Object ID Improvements in CTP 6 February 23, 2015 Live Now on Developer Tools BlogsIn Case You Missed It – This W
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more http://stackoverflow.com/questions/20185015/how-to-write-log-file-in-c about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to write log file in c#? up vote 14 down how to vote favorite 5 How would I write a log file in c#? Currently i have a timer with this statement which ticks every 20 secs: File.WriteAllText(filePath+"log.txt", log); For everything that i want logged i do this: log += "stringToBeLogged"; As you can assume the string log just grows and grows as the program runs. (I don't even know if there is a maximum chars per string?) I assume that how to create there must be better ways of doing this. i just thought that it would be heavy to write the whole file again and again for every time something is added to the log. c# logging share|improve this question edited Nov 19 '15 at 8:20 demonplus 2,88082345 asked Nov 25 '13 at 4:55 user2725580 1852614 5 I suggest to discover something alike log4net –Cynede Nov 25 '13 at 4:57 1 See below answer for link to info about log4net. –Dan Nissenbaum Jan 28 '14 at 16:39 add a comment| 9 Answers 9 active oldest votes up vote 21 down vote accepted From the performance point of view your solution is not optimal. Every time you add another log entry with +=, the whole string is copied to another place in memory. I would recommend using StringBuilder instead: StringBuilder sb; ... sb.Append("log something"); ... // flush every 20 seconds as you do it File.AppendAllText(filePath+"log.txt", sb.ToString()); sb.Clear(); By the way your timer event is probably executed on another thread. So you may want to use a mutex when accessing your sb object. Another thing to consider is what happens to the log entries that were added within the last 20 seconds of the execution.