/
DefaultTraceListener.cs
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/
DefaultTraceListener.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.IO;
using System.Text;
using System.Collections;
using System.Runtime.InteropServices;
using System.Globalization;
namespace System.Diagnostics
{
/// <devdoc>
/// <para>Provides
/// the default output methods and behavior for tracing.</para>
/// </devdoc>
public class DefaultTraceListener : TraceListener
{
private bool _assertUIEnabled;
private bool _settingsInitialized;
private string? _logFileName;
/// <devdoc>
/// <para>Initializes a new instance of the <see cref='System.Diagnostics.DefaultTraceListener'/> class with
/// Default as its <see cref='System.Diagnostics.TraceListener.Name'/>.</para>
/// </devdoc>
public DefaultTraceListener()
: base("Default")
{
}
public bool AssertUiEnabled
{
get
{
if (!_settingsInitialized) InitializeSettings();
return _assertUIEnabled;
}
set
{
if (!_settingsInitialized) InitializeSettings();
_assertUIEnabled = value;
}
}
public string? LogFileName
{
get
{
if (!_settingsInitialized) InitializeSettings();
return _logFileName;
}
set
{
if (!_settingsInitialized) InitializeSettings();
_logFileName = value;
}
}
/// <devdoc>
/// <para>
/// Emits or displays a message
/// and a stack trace for an assertion that
/// always fails.
/// </para>
/// </devdoc>
public override void Fail(string? message)
{
Fail(message, null);
}
/// <devdoc>
/// <para>
/// Emits or displays messages and a stack trace for an assertion that
/// always fails.
/// </para>
/// </devdoc>
public override void Fail(string? message, string? detailMessage)
{
string stackTrace;
try
{
stackTrace = new StackTrace(fNeedFileInfo: true).ToString();
}
catch
{
stackTrace = "";
}
WriteAssert(stackTrace, message, detailMessage);
if (AssertUiEnabled)
{
DebugProvider.FailCore(stackTrace, message, detailMessage, "Assertion Failed");
}
}
private void InitializeSettings()
{
// don't use the property setters here to avoid infinite recursion.
_assertUIEnabled = DiagnosticsConfiguration.AssertUIEnabled;
_logFileName = DiagnosticsConfiguration.LogFileName;
_settingsInitialized = true;
}
private void WriteAssert(string stackTrace, string? message, string? detailMessage)
{
WriteLine(SR.DebugAssertBanner + Environment.NewLine
+ SR.DebugAssertShortMessage + Environment.NewLine
+ message + Environment.NewLine
+ SR.DebugAssertLongMessage + Environment.NewLine
+ detailMessage + Environment.NewLine
+ stackTrace);
}
/// <devdoc>
/// <para>
/// Writes the output using <see cref="System.Diagnostics.Debug.Write(string)"/>.
/// </para>
/// </devdoc>
public override void Write(string? message)
{
Write(message, useLogFile: true);
}
/// <devdoc>
/// <para>
/// Writes the output followed by a line terminator using <see cref="System.Diagnostics.Debug.Write(string)"/>.
/// </para>
/// </devdoc>
public override void WriteLine(string? message)
{
WriteLine(message, useLogFile: true);
}
private void WriteLine(string? message, bool useLogFile)
{
if (NeedIndent)
WriteIndent();
// The concat is done here to enable a single call to Write
Write(message + Environment.NewLine, useLogFile);
NeedIndent = true;
}
private void Write(string? message, bool useLogFile)
{
message ??= string.Empty;
if (NeedIndent && message.Length != 0)
{
WriteIndent();
}
DebugProvider.WriteCore(message);
if (useLogFile && !string.IsNullOrEmpty(LogFileName))
{
WriteToLogFile(message);
}
}
private void WriteToLogFile(string message)
{
try
{
File.AppendAllText(LogFileName!, message);
}
catch (Exception e)
{
WriteLine(SR.Format(SR.ExceptionOccurred, LogFileName, e), useLogFile: false);
}
}
}
}