DefaultTraceListener.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / Diagnostics / DefaultTraceListener.cs / 1 / DefaultTraceListener.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 
#define DEBUG
#define TRACE 
namespace System.Diagnostics { 
    using System;
    using System.IO; 
    using System.Text;
    using System.Collections;
    using System.Reflection;
    using System.Runtime.InteropServices; 
    using System.Security.Permissions;
    using System.Security; 
    using Microsoft.Win32; 
    using System.Globalization;
    using System.Runtime.Versioning; 

    /// 
    ///    Provides
    ///       the default output methods and behavior for tracing. 
    /// 
    [HostProtection(Synchronization=true)] 
    public class DefaultTraceListener : TraceListener { 

        bool assertUIEnabled; 
        string logFileName;
        bool settingsInitialized;
        const int internalWriteSize = 16384;
 

        ///  
        /// Initializes a new instance of the  class with 
        ///    Default as its .
        ///  
        public DefaultTraceListener()
            : base("Default") {
        }
 
        /// 
        ///    [To be supplied.] 
        ///  
        public bool AssertUiEnabled {
            get { 
                if (!settingsInitialized) InitializeSettings();
                return assertUIEnabled;
            }
            set { 
                if (!settingsInitialized) InitializeSettings();
                assertUIEnabled = value; 
            } 
        }
 
        /// 
        ///    [To be supplied.]
        /// 
        public string LogFileName { 
            [ResourceExposure(ResourceScope.Machine)]
            [ResourceConsumption(ResourceScope.Machine)] 
            get { 
                if (!settingsInitialized) InitializeSettings();
                return logFileName; 
            }
            [ResourceExposure(ResourceScope.Machine)]
            [ResourceConsumption(ResourceScope.Machine)]
            set { 
                if (!settingsInitialized) InitializeSettings();
                logFileName = value; 
            } 
        }
 
        /// 
        ///    
        ///       Emits or displays a message
        ///       and a stack trace for an assertion that 
        ///       always fails.
        ///     
        ///  
        public override void Fail(string message) {
            Fail(message, null); 
        }

        /// 
        ///     
        ///       Emits or displays messages and a stack trace for an assertion that
        ///       always fails. 
        ///     
        /// 
        public override void Fail(string message, string detailMessage) { 
            StackTrace stack = new StackTrace(true);
            int userStackFrameIndex = 0;
            string stackTrace;
            bool uiPermission = UiPermission; 

            try { 
                stackTrace = StackTraceToString(stack, userStackFrameIndex, stack.FrameCount - 1); 
            }
            catch { 
                stackTrace = "";
            }

            WriteAssert(stackTrace, message, detailMessage); 
            if (AssertUiEnabled && uiPermission) {
                AssertWrapper.ShowAssert(stackTrace, stack.GetFrame(userStackFrameIndex), message, detailMessage); 
            } 
        }
 
        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)]
        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) {
            string assertMessage = SR.GetString(SR.DebugAssertBanner) + "\r\n"
                                            + SR.GetString(SR.DebugAssertShortMessage) + "\r\n"
                                            + message + "\r\n" 
                                            + SR.GetString(SR.DebugAssertLongMessage) + "\r\n" +
                                            detailMessage + "\r\n" 
                                            + stackTrace; 
            WriteLine(assertMessage);
        } 

        [ResourceExposure(ResourceScope.None)]
        [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)]
        private void WriteToLogFile(string message, bool useWriteLine) { 
            try {
                FileInfo file = new FileInfo(LogFileName); 
                using (Stream stream = file.Open(FileMode.OpenOrCreate)) { 
                    using (StreamWriter writer = new StreamWriter(stream)) {
                        stream.Position = stream.Length; 
                        if (useWriteLine)
                            writer.WriteLine(message);
                        else
                            writer.Write(message); 
                    }
                } 
            } 
            catch (Exception e) {
                WriteLine(SR.GetString(SR.ExceptionOccurred, LogFileName, e.ToString()), false); 
            }
            catch {
                WriteLine(SR.GetString(SR.ExceptionOccurred, LogFileName, ""), false);
            } 
        }
 
 
        // Given a stack trace and start and end frame indexes, construct a
        // callstack that contains method, file and line number information. 
        private string StackTraceToString(StackTrace trace, int startFrameIndex, int endFrameIndex) {
            StringBuilder sb = new StringBuilder(512);

            for (int i = startFrameIndex; i <= endFrameIndex; i++) { 
                StackFrame frame = trace.GetFrame(i);
                MethodBase method = frame.GetMethod(); 
                sb.Append("\r\n    at "); 
                if (method.ReflectedType != null) {
                    sb.Append(method.ReflectedType.Name); 
                }
                else {
                    // This is for global methods and this is what shows up in windbg.
                    sb.Append(""); 
                }
                sb.Append("."); 
                sb.Append(method.Name); 
                sb.Append("(");
                ParameterInfo[] parameters = method.GetParameters(); 
                for (int j = 0; j < parameters.Length; j++) {
                    ParameterInfo parameter = parameters[j];
                    if (j > 0)
                        sb.Append(", "); 
                    sb.Append(parameter.ParameterType.Name);
                    sb.Append(" "); 
                    sb.Append(parameter.Name); 
                }
                sb.Append(")  "); 
                sb.Append(frame.GetFileName());
                int line = frame.GetFileLineNumber();
                if (line > 0) {
                    sb.Append("("); 
                    sb.Append(line.ToString(CultureInfo.InvariantCulture));
                    sb.Append(")"); 
                } 
            }
            sb.Append("\r\n"); 

            return sb.ToString();
        }
 
        /// 
        ///     
        ///       Writes the output to the OutputDebugString 
        ///       API and
        ///       to System.Diagnostics.Debugger.Log. 
        ///    
        /// 
        public override void Write(string message) {
            Write(message, true); 
        }
 
        private void Write(string message, bool useLogFile) { 
            if (NeedIndent) WriteIndent();
 
            // really huge messages mess up both VS and dbmon, so we chop it up into
            // reasonable chunks if it's too big
            if (message == null || message.Length <= internalWriteSize) {
                internalWrite(message); 
            }
            else { 
                int offset; 
                for (offset = 0; offset < message.Length - internalWriteSize; offset += internalWriteSize) {
                    internalWrite(message.Substring(offset, internalWriteSize)); 
                }
                internalWrite(message.Substring(offset));
            }
 
            if (useLogFile && LogFileName.Length != 0)
                WriteToLogFile(message, false); 
        } 

        void internalWrite(string message) { 
            if (Debugger.IsLogging()) {
                Debugger.Log(0, null, message);
            } else {
                if (message == null) 
                    SafeNativeMethods.OutputDebugString(String.Empty);
                else 
                    SafeNativeMethods.OutputDebugString(message); 
            }
        } 

        /// 
        ///    
        ///       Writes the output to the OutputDebugString 
        ///       API and to System.Diagnostics.Debugger.Log
        ///       followed by a line terminator. The default line terminator is a carriage return 
        ///       followed by a line feed (\r\n). 
        ///    
        ///  
        public override void WriteLine(string message) {
            WriteLine(message, true);
        }
 
        private void WriteLine(string message, bool useLogFile) {
            if (NeedIndent) WriteIndent(); 
            // I do the concat here to make sure it goes as one call to the output. 
            // we would save a stringbuilder operation by calling Write twice.
            Write(message + "\r\n", useLogFile); 
            NeedIndent = true;
        }

        ///  
        ///     It returns true if the current permission set allows an assert dialog to be displayed.
        ///  
        private static bool UiPermission { 
            get {
                bool uiPermission = false; 

                try {
                    new UIPermission(UIPermissionWindow.SafeSubWindows).Demand();
                    uiPermission = true; 
                }
                catch { 
                } 
                return uiPermission;
            } 
        }
    }
}
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DefaultTraceListener.cs source code in C# .NET

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