using System; using System.Diagnostics; using DiagnosticsTrace = System.Diagnostics.Trace; namespace Newtonsoft.Json.Serialization { /// <summary> /// Represents a trace writer that writes to the application's <see cref="TraceListener"/> instances. /// </summary> internal class DiagnosticsTraceWriter : ITraceWriter { /// <summary> /// Gets the <see cref="TraceLevel"/> that will be used to filter the trace messages passed to the writer. /// For example a filter level of <see cref="TraceLevel.Info"/> will exclude <see cref="TraceLevel.Verbose"/> messages and include <see cref="TraceLevel.Info"/>, /// <see cref="TraceLevel.Warning"/> and <see cref="TraceLevel.Error"/> messages. /// </summary> /// <value> /// The <see cref="TraceLevel"/> that will be used to filter the trace messages passed to the writer. /// </value> public TraceLevel LevelFilter { get; set; } private TraceEventType GetTraceEventType(TraceLevel level) { switch (level) { case TraceLevel.Error: return TraceEventType.Error; case TraceLevel.Warning: return TraceEventType.Warning; case TraceLevel.Info: return TraceEventType.Information; case TraceLevel.Verbose: return TraceEventType.Verbose; default: throw new ArgumentOutOfRangeException(nameof(level)); } } /// <summary> /// Writes the specified trace level, message and optional exception. /// </summary> /// <param name="level">The <see cref="TraceLevel"/> at which to write this trace.</param> /// <param name="message">The trace message.</param> /// <param name="ex">The trace exception. This parameter is optional.</param> public void Trace(TraceLevel level, string message, Exception ex) { if (level == TraceLevel.Off) { return; } TraceEventCache eventCache = new TraceEventCache(); TraceEventType traceEventType = GetTraceEventType(level); foreach (TraceListener listener in DiagnosticsTrace.Listeners) { if (!listener.IsThreadSafe) { lock (listener) { listener.TraceEvent(eventCache, "Newtonsoft.Json", traceEventType, 0, message); } } else { listener.TraceEvent(eventCache, "Newtonsoft.Json", traceEventType, 0, message); } if (DiagnosticsTrace.AutoFlush) { listener.Flush(); } } } } }