Add Timestamp to Trace.WriteLine()

问题:

In my C# .NET application I have an issue with the Trace.WriteLine()-method. I uses this method alot, and want to add a TimeStamp every time I use it.

Instead of Trace.WriteLine(DateTime.Now + " Something wrong!"), is there a solution where the DateTime is on default?

回答1:

Just write your own "TraceLine(string msg)" method and start calling that:

void TraceLine(string msg, bool OmitDate)
{
    if (!OmitDate)
        msg = DateTime.Now + " " + msg;
    Trace.WriteLine(msg);
}

void TraceLine(string msg) {TraceLine(msg, false);}

回答2:

Via code

You can configure the TraceOutputOptions flags enum.

var listener = new ConsoleTraceListener() { TraceOutputOptions = TraceOptions.Timestamp | TraceOptions.Callstack };
Trace.Listeners.Add(listener);

Trace.TraceInformation("hello world");

This does not work for Write and WriteLine, you have use the TraceXXX methods.

Via app.config

This can also be configured in your App.config with a somewhat equivalent and using TraceSource:

<configuration>
  <system.diagnostics>
    <trace autoflush="true">
      <sources>
        <source name="TraceSourceApp">
          <listeners>
            <add name="myListener" type="System.Diagnostics.ConsoleTraceListener" traceOutputOptions="Timestamp" />
          </listeners>
        </source>
      </sources>
    </trace>
  </system.diagnostics>
</configuration>

And in code you can:

private static TraceSource mySource =   
        new TraceSource("TraceSourceApp");
static void Main(string[] args)
{
  mySource.TraceInformation("hello world");
}

回答3:

You can set the app.config file to use a timestamp (relative and current time) for all trace listeners using the traceOutputOptions

traceOutputOptions = "DateTime, Timestamp";

回答4:

You could write a wrapper method that did it:

public static void DoTrace(string message)
{
    DoTrace(message,true);
}

public static void DoTrace(string message, bool includeDate)
{
    if (includeDate) {
        Trace.WriteLine(DateTime.Now + ": " + message);
    } else {
        Trace.WriteLine(message);
    }
}

回答5:

We use log4net TraceAppender where you can config layout or filtering easily.

回答6:

You could write your own TextWriterTraceListener, as mentioned here.