IisTraceListener.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / IisTraceListener.cs / 3 / IisTraceListener.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

using System; 
using System.Text; 
using System.Web;
using System.Web.Hosting; 
using System.Web.UI;
using System.Diagnostics;
using System.Globalization;
using System.Security.Permissions; 

namespace System.Web { 
 
    [HostProtection(Synchronization=true)]
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public sealed class IisTraceListener : TraceListener {


        public IisTraceListener() { 
            // only supported on IIS version 7 and later
            HttpContext context = HttpContext.Current; 
            if (context != null) { 
                if (!HttpRuntime.UseIntegratedPipeline && !(context.WorkerRequest is ISAPIWorkerRequestInProcForIIS7)) {
                    throw new PlatformNotSupportedException(SR.GetString(SR.Requires_Iis_7)); 
                }
            }
        }
 
        // the listener apis
 
        public override void Write(string message) 
        {
            if (Filter != null && !Filter.ShouldTrace(null, String.Empty, TraceEventType.Verbose, 0, message, null, null, null)) 
                return;

            HttpContext context = HttpContext.Current;
            if (context != null) { 
                context.WorkerRequest.RaiseTraceEvent(IntegratedTraceType.TraceWrite, message);
            } 
        } 

 
        public override void Write(string message, string category)
        {
            if (Filter != null && !Filter.ShouldTrace(null, String.Empty, TraceEventType.Verbose, 0, message, null, null, null))
                return; 

            HttpContext context = HttpContext.Current; 
            if (context != null) { 
                context.WorkerRequest.RaiseTraceEvent(IntegratedTraceType.TraceWrite, message);
            } 
        }


        public override void WriteLine(string message) 
        {
            if (Filter != null && !Filter.ShouldTrace(null, String.Empty, TraceEventType.Verbose, 0, message, null, null, null)) 
                return; 

            HttpContext context = HttpContext.Current; 
            if (context != null) {
                context.WorkerRequest.RaiseTraceEvent(IntegratedTraceType.TraceWrite, message);
            }
        } 

 
        public override void WriteLine(string message, string category) 
        {
            if (Filter != null && !Filter.ShouldTrace(null, String.Empty, TraceEventType.Verbose, 0, message, null, null, null)) 
                return;

            HttpContext context = HttpContext.Current;
            if (context != null) { 
                context.WorkerRequest.RaiseTraceEvent(IntegratedTraceType.TraceWrite, message);
            } 
        } 

    	public override void TraceData(TraceEventCache eventCache, String source, TraceEventType eventType, int id, object data) { 
            if (Filter != null && !Filter.ShouldTrace(eventCache, source, eventType, id, null, null, data, null))
                return;
            HttpContext context = HttpContext.Current;
            if (context != null) { 
                string datastring = String.Empty;
                if (data != null) { 
                    datastring = data.ToString(); 
                }
                context.WorkerRequest.RaiseTraceEvent(Convert(eventType), AppendTraceOptions(eventCache, datastring)); 
            }
        }

    	public override void TraceData(TraceEventCache eventCache, String source, TraceEventType eventType, int id, params object[] data) { 
            HttpContext context = HttpContext.Current;
            if (context == null) 
                return; 
            if (Filter != null && !Filter.ShouldTrace(eventCache, source, eventType, id, null, null, null, data))
                return; 

            StringBuilder sb = new StringBuilder();
            if (data != null) {
                for (int i=0; i< data.Length; i++) { 
                    if (i != 0)
                        sb.Append(", "); 
 
                    if (data[i] != null)
                        sb.Append(data[i].ToString()); 
                }
            }
            if (context != null) {
                context.WorkerRequest.RaiseTraceEvent(Convert(eventType), AppendTraceOptions(eventCache, sb.ToString())); 
            }
        } 
 
        public override void TraceEvent(TraceEventCache eventCache, String source, TraceEventType severity, int id, string message) {
            if (Filter != null && !Filter.ShouldTrace(eventCache, source, severity, id, message, null, null, null)) 
                return;

            HttpContext context = HttpContext.Current;
            if (context == null) 
                return;
 
            context.WorkerRequest.RaiseTraceEvent(Convert(severity), AppendTraceOptions(eventCache, message)); 
        }
 
        public override void TraceEvent(TraceEventCache eventCache, String source, TraceEventType severity, int id, string format, params object[] args) {
            TraceEvent(eventCache, source, severity, id, String.Format(CultureInfo.InvariantCulture, format, args));
        }
 
        // append trace options to message and return the result
        private String AppendTraceOptions(TraceEventCache eventCache, String message) { 
            if (eventCache == null || TraceOutputOptions == TraceOptions.None) { 
                return message;
            } 

            StringBuilder sb = new StringBuilder(message, 1024);

            if (IsEnabled(TraceOptions.ProcessId)) { 
                sb.Append("\r\nProcessId=");
                sb.Append(eventCache.ProcessId); 
            } 

            if (IsEnabled(TraceOptions.LogicalOperationStack)) { 
                sb.Append("\r\nLogicalOperationStack=");
                bool first = true;
                foreach (Object obj in eventCache.LogicalOperationStack) {
                    if (!first) { 
                        sb.Append(", ");
                    } 
                    else { 
                        first = false;
                    } 
                    sb.Append(obj);
                }
            }
 
            if (IsEnabled(TraceOptions.ThreadId)) {
                sb.Append("\r\nThreadId="); 
                sb.Append(eventCache.ThreadId); 
            }
 
            if (IsEnabled(TraceOptions.DateTime)) {
                sb.Append("\r\nDateTime=");
                sb.Append(eventCache.DateTime.ToString("o", CultureInfo.InvariantCulture));
            } 

            if (IsEnabled(TraceOptions.Timestamp)) { 
                sb.Append("\r\nTimestamp="); 
                sb.Append(eventCache.Timestamp);
            } 

            if (IsEnabled(TraceOptions.Callstack)) {
                sb.Append("\r\nCallstack=");
                sb.Append(eventCache.Callstack); 
            }
 
            return sb.ToString(); 
        }
 
        private bool IsEnabled(TraceOptions opts) {
            return (opts & TraceOutputOptions) != 0;
        }
 
        private IntegratedTraceType Convert(TraceEventType tet) {
            switch (tet) { 
                case TraceEventType.Critical: 
                     return IntegratedTraceType.DiagCritical;
                case TraceEventType.Error: 
                     return IntegratedTraceType.DiagError;
                case TraceEventType.Warning:
                     return IntegratedTraceType.DiagWarning;
                case TraceEventType.Information: 
                     return IntegratedTraceType.DiagInfo;
                case TraceEventType.Verbose: 
                     return IntegratedTraceType.DiagVerbose; 
                case TraceEventType.Start:
                     return IntegratedTraceType.DiagStart; 
                case TraceEventType.Stop:
                     return IntegratedTraceType.DiagStop;
                case TraceEventType.Suspend:
                     return IntegratedTraceType.DiagSuspend; 
                case TraceEventType.Resume:
                     return IntegratedTraceType.DiagResume; 
                case TraceEventType.Transfer: 
                     return IntegratedTraceType.DiagTransfer;
            } 
            // Default to verbose logging
            return IntegratedTraceType.DiagVerbose;
        }
    } 
}
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IisTraceListener.cs source code in C# .NET

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