Name
Trace
Synopsis
This class supplies shared methods and properties to
provide tracing ability. The calls to the Trace
methods and properties are
executed only if tracing is enabled. (See the introduction to this
chapter for instructions on enabling tracing.)
The shared properties allow you to adjust the settings that are
used when you call the methods. You can specify that output be
indented a certain amount with IndentLevel
or
increase or decrease the IndentLevel
by one using Indent()
and Unindent()
. You
can also adjust the number of spaces each indent level adds using IndentSize
. AutoFlush
makes
sure that after each use of a Trace
method, the Listeners
are flushed.
Write()
and WriteLine()
simply write to each TraceListener
in the Listeners
collection (by default, this
collection includes an instance of DefaultTraceListener
). WriteIf()
and WriteLineIf()
do the same, but only if the specified condition evaluates to true
. Assert()
emits an
error message if a condition evaluates to false
,
and Fail()
always emits an error message.
One possible point of confusion is that Listeners
is read-only. This means that you may
not point Listeners
to a different collection.
You can, however, add new TraceListener
objects
to the TraceListenerCollection
with the TraceListenerCollection.Add()
method.
You can use the application configuration file to configure this
class. Under the <system.diagnostics>
element,
add a <trace>
element. You can set attributes for this element that correspond ...
Get VB.NET Core Classes in a Nutshell now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.