TraceData.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / TraceData.cs / 3 / TraceData.cs
                        
                        
                            #define TRACE 

//----------------------------------------------------------------------------
//
//  
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
// 
// Description: Defines TraceData class, for providing debugging information
//              for Data Binding and Styling 
//
//---------------------------------------------------------------------------

using System; 
using System.Collections;
using System.ComponentModel; 
using System.Diagnostics; 
using System.Reflection;
using System.Text; 
using System.Windows;
using System.Windows.Data;
using MS.Internal.Data;
using MS.Win32; 

namespace MS.Internal 
{ 
    // levels for the various extended traces
    internal enum TraceDataLevel 
    {
        // Binding and friends
        CreateExpression    = PresentationTraceLevel.High, // 10,
        ShowPath            = PresentationTraceLevel.High, // 11, 
        ResolveDefaults     = PresentationTraceLevel.High, // 13,
        Attach              = PresentationTraceLevel.Low, // 1, 
        AttachToContext     = PresentationTraceLevel.Low, // 2, 
        SourceLookup        = PresentationTraceLevel.Low, // 4,
        Activate            = PresentationTraceLevel.Low, // 3, 
        Transfer            = PresentationTraceLevel.Medium, // 5,
        Update              = PresentationTraceLevel.Medium, // 6,
        Validation          = PresentationTraceLevel.High, // 12,
        Events              = PresentationTraceLevel.Medium, // 7, 
        GetValue            = PresentationTraceLevel.High, // 12,
        ReplaceItem         = PresentationTraceLevel.Medium, // 8, 
        GetInfo             = PresentationTraceLevel.Medium, // 9, 

        // Data providers 
        ProviderQuery       = PresentationTraceLevel.Low, // 1,
        XmlProvider         = PresentationTraceLevel.Medium, // 2,
        XmlBuildCollection  = PresentationTraceLevel.High, // 3,
    } 

    ///  
    /// Provides a central mechanism for providing debugging information 
    /// to aid programmers in using data binding.
    /// Helpers are defined here. 
    /// The rest of the class is generated; see also: AvTraceMessage.txt and genTraceStrings.pl
    /// 
    internal static partial class TraceData
    { 
        // -----------------------------------------------------------------
        // Constructors 
        // ----------------------------------------------------------------- 

        static TraceData() 
        {
            _avTrace.TraceExtraMessages += new AvTraceEventHandler(OnTrace);

            // This tells tracing that IsEnabled should be true if we're in the debugger, 
            // even if the registry flag isn't turned on.  By default, IsEnabled is only
            // true if the registry is set. 
            _avTrace.EnabledByDebugger = true; 

            // This tells the tracing code not to automatically generate the .GetType 
            // and .HashCode in the trace strings.
            _avTrace.SuppressGeneratedParameters = true;
        }
 
        // ------------------------------------------------------------------
        // Methods 
        // ----------------------------------------------------------------- 

        // determine whether an extended trace should be produced for the given 
        // object
        static public bool IsExtendedTraceEnabled(object element, TraceDataLevel level)
        {
            if (TraceData.IsEnabled) 
            {
                PresentationTraceLevel traceLevel = PresentationTraceSources.GetTraceLevel(element); 
                return (traceLevel >= (PresentationTraceLevel)level); 
            }
            else 
                return false;
        }

        // report/describe any additional parameters passed to TraceData.Trace() 
        static public void OnTrace( AvTraceBuilder traceBuilder, object[] parameters, int start )
        { 
            for( int i = start; i < parameters.Length; i++ ) 
            {
                object o = parameters[i]; 
                string s = o as string;
                traceBuilder.Append(" ");
                if (s != null)
                { 
                    traceBuilder.Append(s);
                } 
                else if (o != null) 
                {
                    traceBuilder.Append(o.GetType().Name); 
                    traceBuilder.Append(":");
                    Describe(traceBuilder, o);
                }
                else 
                {
                    traceBuilder.Append("null"); 
                } 
            }
        } 

        // ------------------------------------------------------------------
        // Helper functions for message string construction
        // ------------------------------------------------------------------ 

        ///  
        /// Construct a string that describes data and debugging information about the object. 
        /// A title is appended in front if provided.
        /// If object o is not a recognized object, it will be ToString()'ed. 
        /// 
        /// description will be appended to this builder
        /// object to be described;
        /// currently recognized types: BindingExpression, Binding, DependencyObject, Exception 
        /// a string that describes the object
        static public void Describe(AvTraceBuilder traceBuilder, object o) 
        { 
            if (o == null)
            { 
                traceBuilder.Append("null");
            }

            else if (o is BindingExpression) 
            {
                BindingExpression bindingExpr = o as BindingExpression; 
 
                Describe(traceBuilder, bindingExpr.ParentBinding);
                traceBuilder.Append("; DataItem="); 
                DescribeSourceObject(traceBuilder, bindingExpr.DataItem);
                traceBuilder.Append("; ");
                DescribeTarget(traceBuilder, bindingExpr.TargetElement, bindingExpr.TargetProperty);
            } 

            else if (o is Binding) 
            { 
                Binding binding = o as Binding;
                if (binding.Path != null) 
                    traceBuilder.AppendFormat("Path={0}", binding.Path.Path );
                else if (binding.XPath != null)
                    traceBuilder.AppendFormat("XPath={0}", binding.XPath );
                else 
                    traceBuilder.Append("(no path)");
            } 
 
            else if (o is BindingExpressionBase)
            { 
                BindingExpressionBase beb = o as BindingExpressionBase;
                DescribeTarget(traceBuilder, beb.TargetElement, beb.TargetProperty);
            }
 
            else if (o is DependencyObject)
            { 
               DescribeSourceObject(traceBuilder, o); 
            }
 
            else
            {
                traceBuilder.AppendFormat("'{0}'", AvTrace.ToStringHelper(o));
            } 
        }
 
        ///  
        /// Produces a string that describes a source object:
        /// e.g. element in a Binding Path, DataItem in BindingExpression, ContextElement 
        /// 
        /// description will be appended to this builder
        /// a source object (e.g. element in a Binding Path, DataItem in BindingExpression, ContextElement)
        /// a string that describes the object 
        static public void DescribeSourceObject(AvTraceBuilder traceBuilder, object o)
        { 
            if (o == null) 
            {
                traceBuilder.Append("null"); 
            }
            else
            {
                FrameworkElement fe = o as FrameworkElement; 
                if (fe != null)
                { 
                    traceBuilder.AppendFormat("'{0}' (Name='{1}')", fe.GetType().Name, fe.Name); 
                }
                else 
                {
                    traceBuilder.AppendFormat("'{0}' (HashCode={1})", o.GetType().Name, o.GetHashCode());
                }
            } 
        }
 
        ///  
        /// 
        static public string DescribeSourceObject(object o) 
        {
            AvTraceBuilder atb = new AvTraceBuilder(null);
            DescribeSourceObject(atb, o);
            return atb.ToString(); 
        }
 
        ///  
        /// Produces a string that describes TargetElement and TargetProperty
        ///  
        /// description will be appended to this builder
        /// TargetElement
        /// TargetProperty
        /// a string that describes TargetElement and TargetProperty 
        static public void DescribeTarget(AvTraceBuilder traceBuilder, DependencyObject targetElement, DependencyProperty targetProperty)
        { 
            if (targetElement != null) 
            {
                traceBuilder.Append("target element is "); 
                DescribeSourceObject(traceBuilder, targetElement);
                if (targetProperty != null)
                {
                    traceBuilder.Append("; "); 
                }
            } 
 
            if (targetProperty != null)
            { 
                traceBuilder.AppendFormat("target property is '{0}' (type '{1}')", targetProperty.Name, targetProperty.PropertyType.Name);
            }
        }
 
        /// 
        ///  
        static public string DescribeTarget(DependencyObject targetElement, DependencyProperty targetProperty) 
        {
            AvTraceBuilder atb = new AvTraceBuilder(null); 
            DescribeTarget(atb, targetElement, targetProperty);
            return atb.ToString();
        }
 
        static public string Identify(object o)
        { 
            if (o == null) 
                return "";
 
            Type type = o.GetType();

            if (type.IsPrimitive || type.IsEnum)
                return Format("'{0}'", o); 

            string s = o as String; 
            if (s != null) 
                return Format("'{0}'", AntiFormat(s));
 
            NamedObject n = o as NamedObject;
            if (n != null)
                return AntiFormat(n.ToString());
 
            ICollection ic = o as ICollection;
            if (ic != null) 
                return Format("{0} (hash={1} Count={2})", type.Name, AvTrace.GetHashCodeHelper(o), ic.Count); 

            return Format("{0} (hash={1})", type.Name, AvTrace.GetHashCodeHelper(o)); 
        }

        static public string IdentifyWeakEvent(Type type)
        { 
            const string suffix = "EventManager";
            string name = type.Name; 
            if (name.EndsWith(suffix, StringComparison.Ordinal)) 
            {
                name = name.Substring(0, name.Length - suffix.Length); 
            }

            return name;
        } 

        static public string IdentifyAccessor(object accessor) 
        { 
            DependencyProperty dp = accessor as DependencyProperty;
            if (dp != null) 
                return Format("{0}({1})", dp.GetType().Name, dp.Name);

            PropertyInfo pi = accessor as PropertyInfo;;
            if (pi != null) 
                return Format("{0}({1})", pi.GetType().Name, pi.Name);
 
            PropertyDescriptor pd = accessor as PropertyDescriptor;; 
            if (pd != null)
                return Format("{0}({1})", pd.GetType().Name, pd.Name); 

            return Identify(accessor);
        }
 
        static public string IdentifyException(Exception ex)
        { 
            if (ex == null) 
                return "";
 
            return Format("{0} ({1})", ex.GetType().Name, AntiFormat(ex.Message));
        }

        static string Format(string format, params object[] args) 
        {
            return String.Format(DataBindEngine.EnglishUSCulture, format, args); 
        } 

        // replace { and } by {{ and }} - call if literal string will be passed to Format 
        static string AntiFormat(string s)
        {
            int formatIndex = s.IndexOfAny(FormatChars);
            if (formatIndex < 0) 
                return s;
 
            StringBuilder sb = new StringBuilder(); 
            int index = 0;
            while (formatIndex >= 0) 
            {
                sb.Append(s.Substring(index, formatIndex - index + 1));
                sb.Append(s[formatIndex]);
 
                index = formatIndex + 1;
                formatIndex = s.IndexOfAny(FormatChars, index); 
            } 

            return sb.ToString(); 
        }

        static char[] FormatChars = new char[]{ '{', '}' };
 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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