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Enable Debug.Assert under ASP.NET

By , 22 Jan 2003
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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:

<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.

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:

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.

A list of licenses authors might use can be found here

About the Author

Red Forks

China China
No Biography provided

Comments and Discussions

 
GeneralMy vote of 1 Pinmemberdeepakdynamite23-Aug-12 18:29 
GeneralMy vote of 2 Pinmemberamittrivedimca7-Jul-09 21:31 
Generalhistory of Debug.Assert [modified] PinmemberMichael Freidgeim23-Nov-11 10:13 
Generalbreak into code when calling Debug.Assert PinmemberMichael Freidgeim12-Aug-04 14:23 
GeneralOther syntax PinsitebuilderUwe Keim26-Jan-03 19:13 

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