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// Copyright (c) 2007 James Newton-King
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#if !(NET35 || NET20 || PORTABLE)
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Diagnostics;
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using System.Reflection;
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using System.Runtime.Serialization;
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using System.Threading.Tasks;
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using Newtonsoft.Json.Converters;
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using Newtonsoft.Json.Linq;
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using NUnit.Framework;
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using Microsoft.VisualStudio.TestPlatform.UnitTestFramework;
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using TestFixture = Microsoft.VisualStudio.TestPlatform.UnitTestFramework.TestClassAttribute;
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using Test = Microsoft.VisualStudio.TestPlatform.UnitTestFramework.TestMethodAttribute;
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using Newtonsoft.Json.Serialization;
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using Newtonsoft.Json.Tests.Serialization;
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using Newtonsoft.Json.Tests.TestObjects;
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using Newtonsoft.Json.Utilities;
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using System.Globalization;
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namespace Newtonsoft.Json.Tests.Documentation
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public class TraceWriterTests : TestFixtureBase
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public class LogEventInfo
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public LogLevel Level;
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public string Message;
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public Exception Exception;
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public static LogLevel Info;
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public static LogLevel Trace;
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public static LogLevel Error;
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public static LogLevel Warn;
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public static LogLevel Off;
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public void Log(LogEventInfo logEvent)
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public static class LogManager
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public static Logger GetLogger(string className)
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#region CustomTraceWriterExample
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public class NLogTraceWriter : ITraceWriter
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private static readonly Logger Logger = LogManager.GetLogger("NLogTraceWriter");
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public TraceLevel LevelFilter
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// trace all messages. nlog can handle filtering
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get { return TraceLevel.Verbose; }
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public void Trace(TraceLevel level, string message, Exception ex)
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LogEventInfo logEvent = new LogEventInfo
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Level = GetLogLevel(level),
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// log Json.NET message to NLog
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Logger.Log(logEvent);
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private LogLevel GetLogLevel(TraceLevel level)
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case TraceLevel.Error:
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return LogLevel.Error;
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case TraceLevel.Warning:
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return LogLevel.Warn;
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case TraceLevel.Info:
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return LogLevel.Info;
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return LogLevel.Trace;
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public void MemoryTraceWriterTest()
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#region MemoryTraceWriterExample
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Staff staff = new Staff();
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staff.Name = "Arnie Admin";
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staff.Roles = new List<string> { "Administrator" };
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staff.StartDate = DateTime.Now;
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ITraceWriter traceWriter = new MemoryTraceWriter();
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JsonConvert.SerializeObject(
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new JsonSerializerSettings { TraceWriter = traceWriter, Converters = { new JavaScriptDateTimeConverter() } });
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Console.WriteLine(traceWriter);
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// 2012-11-11T12:08:42.761 Info Started serializing Newtonsoft.Json.Tests.Serialization.Staff. Path ''.
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// 2012-11-11T12:08:42.785 Info Started serializing System.DateTime with converter Newtonsoft.Json.Converters.JavaScriptDateTimeConverter. Path 'StartDate'.
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// 2012-11-11T12:08:42.791 Info Finished serializing System.DateTime with converter Newtonsoft.Json.Converters.JavaScriptDateTimeConverter. Path 'StartDate'.
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// 2012-11-11T12:08:42.797 Info Started serializing System.Collections.Generic.List`1[System.String]. Path 'Roles'.
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// 2012-11-11T12:08:42.798 Info Finished serializing System.Collections.Generic.List`1[System.String]. Path 'Roles'.
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// 2012-11-11T12:08:42.799 Info Finished serializing Newtonsoft.Json.Tests.Serialization.Staff. Path ''.
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MemoryTraceWriter memoryTraceWriter = (MemoryTraceWriter)traceWriter;
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Assert.AreEqual(743, memoryTraceWriter.ToString().Length);
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Assert.AreEqual(6, memoryTraceWriter.GetTraceMessages().Count());
b'\\ No newline at end of file'