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Posted 2 Jan 2003

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Enable Debug.Assert under ASP.NET

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3.06/5 (9 votes)
22 Jan 2003
Enable Debug.Assert under ASP.NET just like under windows Forms

Sample Image - DebugListener.png

Introduction

Class System.Diagnostics.Debug provides a serial of Debug methods, such as Debug.Assert, Debug.Fail. They only work under Windows.Form applications. Under ASP.NET, no popup window will show to alert user that debug version has caught a potential logic error!

Using the code

Edit your root web.config file of your ASP.NET project:

XML
<configuration>
   <system.diagnostics>
      <assert assertuienabled="false" logfilename="c:\Debug.log" />
         <trace autoflush="true" indentsize="0">
            <listeners>
              <add type="AspNetDebugListener.DebugListener,AspNetDebugListener" />
            </listeners>
         </trace>
   </system.diagnostics>
</configuration>

How it works

TraceListener class provides the abstract base class for the listeners who monitor the trace and debug output. So derive a new class that can monitor debug output too.

C#
public class DebugListener : TraceListener 
{
    public DebugListener() : this("Forks Asp.Net DebugTracer")
    {
    }

Filter the output string

DebugListener uses Environment.StackTrace to print out the stacktrace. But it will print out many useless Debug.Assert... calling frame, I use a filter to remove it:

C#
string GetStatckTraceString()
{
    string s = Environment.StackTrace;
    StringBuilder sb = new StringBuilder(s.Length);
    using (StringReader reader = new StringReader(s))
    {
        bool debugFound = false;
        for(;;)
        {
            string line = reader.ReadLine();
            if (line == null)
                break;

            if (line.IndexOf("System.Diagnostics.Debug.Assert") != -1)
            {
                debugFound = true;
                continue;
            }

            if (debugFound)
            {
                sb.Append(line);
                sb.Append(Environment.NewLine);
            }
        }
    }

    return sb.ToString();
}

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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Comments and Discussions

 
GeneralMy vote of 2 Pin
amittrivedimca7-Jul-09 22:31
amittrivedimca7-Jul-09 22:31 
Generalhistory of Debug.Assert Pin
Michael Freidgeim23-Nov-11 11:13
Michael Freidgeim23-Nov-11 11:13 
Generalbreak into code when calling Debug.Assert Pin
Michael Freidgeim12-Aug-04 15:23
Michael Freidgeim12-Aug-04 15:23 
GeneralOther syntax Pin
Uwe Keim26-Jan-03 20:13
sitebuilderUwe Keim26-Jan-03 20:13 

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