IisTraceListener.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / IisTraceListener.cs / 1305376 / 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)]
    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;
        }
    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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IisTraceListener.cs source code in C# .NET

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