DbgUtil.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / Misc / DbgUtil.cs / 1 / DbgUtil.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

// SECREVIEW: This is a debug-only library that won't ship with retail builds. 
// 
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1801:AvoidUnusedParameters", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.AssertFinalization(System.Object,System.Boolean):System.Void")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.AssertFinalization(System.Object,System.Boolean):System.Void")] 
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.FormatMessage(System.Int32,System.Runtime.InteropServices.HandleRef,System.Int32,System.Int32,System.Text.StringBuilder,System.Int32,System.Runtime.InteropServices.HandleRef):System.Int32")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA902:MovePInvokesToNativeMethodsClass", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.FormatMessage(System.Int32,System.Runtime.InteropServices.HandleRef,System.Int32,System.Int32,System.Text.StringBuilder,System.Int32,System.Runtime.InteropServices.HandleRef):System.Int32")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2101:SpecifyMarshalingForPInvokeStringArguments", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.FormatMessage(System.Int32,System.Runtime.InteropServices.HandleRef,System.Int32,System.Int32,System.Text.StringBuilder,System.Int32,System.Runtime.InteropServices.HandleRef):System.Int32")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.GetLastErrorStr():System.String")] 
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.GetLastErrorStr():System.String")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.GetUserDefaultLCID():System.Int32")] 
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA902:MovePInvokesToNativeMethodsClass", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.GetUserDefaultLCID():System.Int32")] 
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2205:UseManagedEquivalentsOfWin32Api", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.GetUserDefaultLCID():System.Int32")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.IsCriticalException(System.Exception):System.Boolean")] 
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.StackFramesToStr(System.Int32):System.String")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1818:DoNotConcatenateStringsInsideLoops", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.StackFramesToStr(System.Int32):System.String")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Interoperability", "CA1404:CallGetLastErrorImmediatelyAfterPInvoke", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.GetLastErrorStr():System.String")]
 

#if WINFORMS_NAMESPACE 
namespace System.Windows.Forms.Internal 
#elif DRAWING_NAMESPACE
namespace System.Drawing.Internal 
#else
namespace System.Internal
#endif
{ 
    using System;
    using System.Drawing; 
    using System.Diagnostics; 
    using System.Diagnostics.CodeAnalysis;
    using System.Reflection; 
    using System.Text;
    using System.Runtime.InteropServices;
    using System.Security.Permissions;
    using System.Globalization; 

 
    ///  
    /// 
    /// Debug help utility. 
    /// 
    [
    ReflectionPermission(SecurityAction.Assert, TypeInformation=true, MemberAccess=true),
    EnvironmentPermission(SecurityAction.Assert, Unrestricted=true), 
    FileIOPermission(SecurityAction.Assert, Unrestricted=true),
    SecurityPermission(SecurityAction.Assert, Flags=SecurityPermissionFlag.UnmanagedCode), 
    UIPermission(SecurityAction.Assert, Unrestricted=true) 
    ]
    internal sealed class DbgUtil 
    {
        public const int
            FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x00000100,
            FORMAT_MESSAGE_IGNORE_INSERTS  = 0x00000200, 
            FORMAT_MESSAGE_FROM_SYSTEM     = 0x00001000,
            FORMAT_MESSAGE_DEFAULT         = FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM; 
 
        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)]
        public static extern int GetUserDefaultLCID(); 
        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)]
        public static extern int FormatMessage(int dwFlags, HandleRef lpSource, int dwMessageId, int dwLanguageId, StringBuilder lpBuffer, int nSize, HandleRef arguments);

        public static int gdipInitMaxFrameCount = 8; 
        public static int gdiUseMaxFrameCount = 8;
        public static int finalizeMaxFrameCount = 5; 
 
        // Methods
 

        /// 
        ///   Call this method from your Dispose(bool) to assert that unmanaged resources has been explicitly disposed.
        ///  
        [Conditional("DEBUG")] // This code will be compiled into the assembly anyways, it is up to the compiler to ignore the call.
        public static void AssertFinalization(object obj, bool disposing) 
        { 
#if GDI_FINALIZATION_WATCH
            if( disposing || AppDomain.CurrentDomain.IsFinalizingForUnload() ) 
            {
                return;
            }
 
            try
            { 
                BindingFlags bindingFlags = BindingFlags.NonPublic | BindingFlags.GetField | BindingFlags.Static | BindingFlags.Instance; 
                FieldInfo allocSiteFld = obj.GetType().GetField("AllocationSite", bindingFlags);
                string allocationSite = allocSiteFld != null ? allocSiteFld.GetValue( obj ).ToString() : ""; 

                // ignore ojects created by WindowsGraphicsCacheManager.
                if( allocationSite.Contains("WindowsGraphicsCacheManager") )
                { 
                    return;
                } 
 
                Debug.Fail("Object Disposed through finalization - it should be explicitly disposed.");
                Debug.WriteLine("Allocation stack:\r\n" + allocationSite); 
            }
            catch(Exception ex)
            {
                try 
                {
                    Debug.WriteLine("Exception thrown while trying to get allocation stack: " + ex); 
                } 
                catch
                { 
                }
            }
#endif
        } 

        ///  
        ///  
        [Conditional("DEBUG")]
        public static void AssertWin32(bool expression, string message) 
        {
#if DEBUG
            if( !expression )
            { 
                Debug.Fail(message + "\r\nError: " + DbgUtil.GetLastErrorStr());
            } 
#endif 
        }
 
        /// 
        /// 
        [Conditional("DEBUG")]
        public static void AssertWin32(bool expression, string format, object arg1) 
        {
#if DEBUG 
            if( !expression ) 
            {
                object[] args = new object[]{ arg1 }; 
                AssertWin32Impl( expression, format, args );
            }
#endif
        } 

        ///  
        ///  
        [Conditional("DEBUG")]
        public static void AssertWin32(bool expression, string format, object arg1, object arg2) 
        {
#if DEBUG
            if( !expression )
            { 
                object[] args = new object[]{ arg1, arg2 };
                AssertWin32Impl( expression, format, args ); 
            } 
#endif
        } 

        /// 
        /// 
        [Conditional("DEBUG")] 
        public static void AssertWin32(bool expression, string format, object arg1, object arg2, object arg3)
        { 
#if DEBUG 
            if( !expression )
            { 
                object[] args = new object[]{ arg1, arg2, arg3 };
                AssertWin32Impl( expression, format, args );
            }
#endif 
        }
 
        ///  
        /// 
        [Conditional("DEBUG")] 
        public static void AssertWin32(bool expression, string format, object arg1, object arg2, object arg3, object arg4)
        {
#if DEBUG
            if( !expression ) 
            {
                object[] args = new object[]{ arg1, arg2, arg3, arg4 }; 
                AssertWin32Impl( expression, format, args ); 
            }
#endif 
        }

        /// 
        ///  
        [Conditional("DEBUG")]
        public static void AssertWin32(bool expression, string format, object arg1, object arg2, object arg3, object arg4, object arg5) 
        { 
#if DEBUG
            if( !expression ) 
            {
                object[] args = new object[]{ arg1, arg2, arg3, arg4, arg5 };
                AssertWin32Impl( expression, format, args );
            } 
#endif
        } 
 
        /// 
        ///  
        [Conditional("DEBUG")] // This code will be compiled into the assembly anyways, it is up to the compiler to ignore the call.
        private static void AssertWin32Impl(bool expression, string format, object[] args)
        {
#if DEBUG 
            if( !expression )
            { 
                string message = string.Format(CultureInfo.CurrentCulture, format, args); 
                Debug.Fail(message + "\r\nError: " + DbgUtil.GetLastErrorStr());
            } 
#endif
        }

        // 
        // WARNING: Your PInvoke function needs to have the DllImport.SetLastError=true for this method
        // to work properly.  From the MSDN: 
        // GetLastWin32Error exposes the Win32 GetLastError API method from Kernel32.DLL. This method exists 
        // because it is not safe to make a direct platform invoke call to GetLastError to obtain this information.
        // If you want to access this error code, you must call GetLastWin32Error rather than writing your own 
        // platform invoke definition for GetLastError and calling it. The common language runtime can make
        // internal calls to APIs that overwrite the operating system maintained GetLastError.
        //
        // You can only use this method to obtain error codes if you apply the System.Runtime.InteropServices.DllImportAttribute 
        // to the method signature and set the SetLastError field to true.
        // 
        [SuppressMessage("Microsoft.Interoperability", "CA1404:CallGetLastErrorImmediatelyAfterPInvoke")] 
        public static string GetLastErrorStr()
        { 
            int MAX_SIZE = 255;
            StringBuilder buffer = new StringBuilder(MAX_SIZE);
            string message = String.Empty;
            int err = 0; 

            try 
            { 
                err = Marshal.GetLastWin32Error();
 
                int retVal = FormatMessage(
                    FORMAT_MESSAGE_DEFAULT,
                    new HandleRef(null, IntPtr.Zero),
                    err, 
                    GetUserDefaultLCID(),
                    buffer, 
                    MAX_SIZE, 
                    new HandleRef(null, IntPtr.Zero) );
 
                message = retVal != 0 ? buffer.ToString() : "";
            }
            catch( Exception ex)
            { 
                if( DbgUtil.IsCriticalException(ex) )
                { 
                    throw;  //rethrow critical exception. 
                }
                message = ex.ToString(); 
            }

            return String.Format( CultureInfo.CurrentCulture, "0x{0:x8} - {1}", err, message);
        } 

        ///  
        ///   Duplicated here from ClientUtils not to depend on that code because this class is to be 
        ///   compiled into System.Drawing and System.Windows.Forms.
        ///  
        private static bool IsCriticalException( Exception ex )
        {
            return		
                //ex is NullReferenceException || 
                ex is StackOverflowException ||
                ex is OutOfMemoryException   || 
                ex is System.Threading.ThreadAbortException; 
        }
 
        /// 
        /// 
        public static string StackTrace
        { 
            get
            { 
                return Environment.StackTrace; 
            }
        } 

        /// 
        ///   Returns information about the top stack frames in a string format.  The input param determines the number of
        ///   frames to include. 
        /// 
        public static string StackFramesToStr( int maxFrameCount ) 
        { 
            string trace = String.Empty;
 
            try
            {
                StackTrace st = new StackTrace( true );
                int dbgUtilFrameCount = 0; 

                // 
                // Ignore frames for methods on this library. 
                // Note: The stack frame holds the latest frame at index 0.
                // 
                while( dbgUtilFrameCount < st.FrameCount )
                {
                    StackFrame sf = st.GetFrame(dbgUtilFrameCount);
 
                    if( sf == null || sf.GetMethod().DeclaringType != typeof(DbgUtil) )
                    { 
                        break; 
                    }
 
                    dbgUtilFrameCount++;
                }

                maxFrameCount += dbgUtilFrameCount; // add ignored frames. 

                if( maxFrameCount > st.FrameCount ) 
                { 
                    maxFrameCount = st.FrameCount;
                } 

                for(int i = dbgUtilFrameCount; i < maxFrameCount; i++ )
                {
                    StackFrame sf = st.GetFrame(i); 

                    if( sf == null ) 
                    { 
                        continue;
                    } 

                    MethodBase mi = sf.GetMethod();

                    if( mi == null ) 
                    {
                        continue; 
                    } 

                    string args = String.Empty; 
                    string fileName = sf.GetFileName();

                    int backSlashIndex = fileName == null ? -1 : fileName.LastIndexOf( '\\' );
 
                    if( backSlashIndex != -1 )
                    { 
                        fileName = fileName.Substring( backSlashIndex + 1, fileName.Length - backSlashIndex - 1); 
                    }
 
                    foreach( ParameterInfo pi in mi.GetParameters() )
                    {
                        args += pi.ParameterType.Name + ", ";
                    } 

                    if( args.Length > 0 )   // remove last comma. 
                    { 
                        args = args.Substring(0, args.Length - 2);
                    } 

                    trace += String.Format(CultureInfo.CurrentCulture, "at {0}:{1} {2}.{3}({4})\r\n", fileName, sf.GetFileLineNumber(), mi.DeclaringType, mi.Name, args );
                }
            } 
            catch( Exception ex )
            { 
                if( DbgUtil.IsCriticalException(ex) ) 
                {
                    throw;  //rethrow critical exception. 
                }
                trace += ex.ToString();
            }
 
            return trace.ToString();
        } 
 
        /// 
        ///   Returns information about the top stack frames in a string format. 
        /// 
        public static string StackFramesToStr()
        {
            return StackFramesToStr( DbgUtil.gdipInitMaxFrameCount ); 
        }
 
        ///  
        ///   Returns information about the top stack frames in a string format.  The input param determines the number of
        ///   frames to include.  The 'message' parameter is used as the header of the returned string. 
        /// 
        public static string StackTraceToStr( string message, int frameCount )
        {
            return String.Format( CultureInfo.CurrentCulture, "{0}\r\nTop Stack Trace:\r\n{1}", message, DbgUtil.StackFramesToStr(frameCount)); 
        }
 
        ///  
        ///   Returns information about the top stack frames in a string format. The 'message' parameter is used as the header of the returned string.
        ///  
        public static string StackTraceToStr( string message )
        {
            return StackTraceToStr(message, DbgUtil.gdipInitMaxFrameCount );
        } 
    }
} 
 

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

// SECREVIEW: This is a debug-only library that won't ship with retail builds. 
// 
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1801:AvoidUnusedParameters", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.AssertFinalization(System.Object,System.Boolean):System.Void")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.AssertFinalization(System.Object,System.Boolean):System.Void")] 
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.FormatMessage(System.Int32,System.Runtime.InteropServices.HandleRef,System.Int32,System.Int32,System.Text.StringBuilder,System.Int32,System.Runtime.InteropServices.HandleRef):System.Int32")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA902:MovePInvokesToNativeMethodsClass", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.FormatMessage(System.Int32,System.Runtime.InteropServices.HandleRef,System.Int32,System.Int32,System.Text.StringBuilder,System.Int32,System.Runtime.InteropServices.HandleRef):System.Int32")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2101:SpecifyMarshalingForPInvokeStringArguments", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.FormatMessage(System.Int32,System.Runtime.InteropServices.HandleRef,System.Int32,System.Int32,System.Text.StringBuilder,System.Int32,System.Runtime.InteropServices.HandleRef):System.Int32")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.GetLastErrorStr():System.String")] 
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.GetLastErrorStr():System.String")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.GetUserDefaultLCID():System.Int32")] 
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA902:MovePInvokesToNativeMethodsClass", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.GetUserDefaultLCID():System.Int32")] 
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2205:UseManagedEquivalentsOfWin32Api", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.GetUserDefaultLCID():System.Int32")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.IsCriticalException(System.Exception):System.Boolean")] 
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.StackFramesToStr(System.Int32):System.String")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1818:DoNotConcatenateStringsInsideLoops", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.StackFramesToStr(System.Int32):System.String")]
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Interoperability", "CA1404:CallGetLastErrorImmediatelyAfterPInvoke", Scope="member", Target="System.Windows.Forms.Internal.DbgUtil.GetLastErrorStr():System.String")]
 

#if WINFORMS_NAMESPACE 
namespace System.Windows.Forms.Internal 
#elif DRAWING_NAMESPACE
namespace System.Drawing.Internal 
#else
namespace System.Internal
#endif
{ 
    using System;
    using System.Drawing; 
    using System.Diagnostics; 
    using System.Diagnostics.CodeAnalysis;
    using System.Reflection; 
    using System.Text;
    using System.Runtime.InteropServices;
    using System.Security.Permissions;
    using System.Globalization; 

 
    ///  
    /// 
    /// Debug help utility. 
    /// 
    [
    ReflectionPermission(SecurityAction.Assert, TypeInformation=true, MemberAccess=true),
    EnvironmentPermission(SecurityAction.Assert, Unrestricted=true), 
    FileIOPermission(SecurityAction.Assert, Unrestricted=true),
    SecurityPermission(SecurityAction.Assert, Flags=SecurityPermissionFlag.UnmanagedCode), 
    UIPermission(SecurityAction.Assert, Unrestricted=true) 
    ]
    internal sealed class DbgUtil 
    {
        public const int
            FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x00000100,
            FORMAT_MESSAGE_IGNORE_INSERTS  = 0x00000200, 
            FORMAT_MESSAGE_FROM_SYSTEM     = 0x00001000,
            FORMAT_MESSAGE_DEFAULT         = FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM; 
 
        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)]
        public static extern int GetUserDefaultLCID(); 
        [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)]
        public static extern int FormatMessage(int dwFlags, HandleRef lpSource, int dwMessageId, int dwLanguageId, StringBuilder lpBuffer, int nSize, HandleRef arguments);

        public static int gdipInitMaxFrameCount = 8; 
        public static int gdiUseMaxFrameCount = 8;
        public static int finalizeMaxFrameCount = 5; 
 
        // Methods
 

        /// 
        ///   Call this method from your Dispose(bool) to assert that unmanaged resources has been explicitly disposed.
        ///  
        [Conditional("DEBUG")] // This code will be compiled into the assembly anyways, it is up to the compiler to ignore the call.
        public static void AssertFinalization(object obj, bool disposing) 
        { 
#if GDI_FINALIZATION_WATCH
            if( disposing || AppDomain.CurrentDomain.IsFinalizingForUnload() ) 
            {
                return;
            }
 
            try
            { 
                BindingFlags bindingFlags = BindingFlags.NonPublic | BindingFlags.GetField | BindingFlags.Static | BindingFlags.Instance; 
                FieldInfo allocSiteFld = obj.GetType().GetField("AllocationSite", bindingFlags);
                string allocationSite = allocSiteFld != null ? allocSiteFld.GetValue( obj ).ToString() : ""; 

                // ignore ojects created by WindowsGraphicsCacheManager.
                if( allocationSite.Contains("WindowsGraphicsCacheManager") )
                { 
                    return;
                } 
 
                Debug.Fail("Object Disposed through finalization - it should be explicitly disposed.");
                Debug.WriteLine("Allocation stack:\r\n" + allocationSite); 
            }
            catch(Exception ex)
            {
                try 
                {
                    Debug.WriteLine("Exception thrown while trying to get allocation stack: " + ex); 
                } 
                catch
                { 
                }
            }
#endif
        } 

        ///  
        ///  
        [Conditional("DEBUG")]
        public static void AssertWin32(bool expression, string message) 
        {
#if DEBUG
            if( !expression )
            { 
                Debug.Fail(message + "\r\nError: " + DbgUtil.GetLastErrorStr());
            } 
#endif 
        }
 
        /// 
        /// 
        [Conditional("DEBUG")]
        public static void AssertWin32(bool expression, string format, object arg1) 
        {
#if DEBUG 
            if( !expression ) 
            {
                object[] args = new object[]{ arg1 }; 
                AssertWin32Impl( expression, format, args );
            }
#endif
        } 

        ///  
        ///  
        [Conditional("DEBUG")]
        public static void AssertWin32(bool expression, string format, object arg1, object arg2) 
        {
#if DEBUG
            if( !expression )
            { 
                object[] args = new object[]{ arg1, arg2 };
                AssertWin32Impl( expression, format, args ); 
            } 
#endif
        } 

        /// 
        /// 
        [Conditional("DEBUG")] 
        public static void AssertWin32(bool expression, string format, object arg1, object arg2, object arg3)
        { 
#if DEBUG 
            if( !expression )
            { 
                object[] args = new object[]{ arg1, arg2, arg3 };
                AssertWin32Impl( expression, format, args );
            }
#endif 
        }
 
        ///  
        /// 
        [Conditional("DEBUG")] 
        public static void AssertWin32(bool expression, string format, object arg1, object arg2, object arg3, object arg4)
        {
#if DEBUG
            if( !expression ) 
            {
                object[] args = new object[]{ arg1, arg2, arg3, arg4 }; 
                AssertWin32Impl( expression, format, args ); 
            }
#endif 
        }

        /// 
        ///  
        [Conditional("DEBUG")]
        public static void AssertWin32(bool expression, string format, object arg1, object arg2, object arg3, object arg4, object arg5) 
        { 
#if DEBUG
            if( !expression ) 
            {
                object[] args = new object[]{ arg1, arg2, arg3, arg4, arg5 };
                AssertWin32Impl( expression, format, args );
            } 
#endif
        } 
 
        /// 
        ///  
        [Conditional("DEBUG")] // This code will be compiled into the assembly anyways, it is up to the compiler to ignore the call.
        private static void AssertWin32Impl(bool expression, string format, object[] args)
        {
#if DEBUG 
            if( !expression )
            { 
                string message = string.Format(CultureInfo.CurrentCulture, format, args); 
                Debug.Fail(message + "\r\nError: " + DbgUtil.GetLastErrorStr());
            } 
#endif
        }

        // 
        // WARNING: Your PInvoke function needs to have the DllImport.SetLastError=true for this method
        // to work properly.  From the MSDN: 
        // GetLastWin32Error exposes the Win32 GetLastError API method from Kernel32.DLL. This method exists 
        // because it is not safe to make a direct platform invoke call to GetLastError to obtain this information.
        // If you want to access this error code, you must call GetLastWin32Error rather than writing your own 
        // platform invoke definition for GetLastError and calling it. The common language runtime can make
        // internal calls to APIs that overwrite the operating system maintained GetLastError.
        //
        // You can only use this method to obtain error codes if you apply the System.Runtime.InteropServices.DllImportAttribute 
        // to the method signature and set the SetLastError field to true.
        // 
        [SuppressMessage("Microsoft.Interoperability", "CA1404:CallGetLastErrorImmediatelyAfterPInvoke")] 
        public static string GetLastErrorStr()
        { 
            int MAX_SIZE = 255;
            StringBuilder buffer = new StringBuilder(MAX_SIZE);
            string message = String.Empty;
            int err = 0; 

            try 
            { 
                err = Marshal.GetLastWin32Error();
 
                int retVal = FormatMessage(
                    FORMAT_MESSAGE_DEFAULT,
                    new HandleRef(null, IntPtr.Zero),
                    err, 
                    GetUserDefaultLCID(),
                    buffer, 
                    MAX_SIZE, 
                    new HandleRef(null, IntPtr.Zero) );
 
                message = retVal != 0 ? buffer.ToString() : "";
            }
            catch( Exception ex)
            { 
                if( DbgUtil.IsCriticalException(ex) )
                { 
                    throw;  //rethrow critical exception. 
                }
                message = ex.ToString(); 
            }

            return String.Format( CultureInfo.CurrentCulture, "0x{0:x8} - {1}", err, message);
        } 

        ///  
        ///   Duplicated here from ClientUtils not to depend on that code because this class is to be 
        ///   compiled into System.Drawing and System.Windows.Forms.
        ///  
        private static bool IsCriticalException( Exception ex )
        {
            return		
                //ex is NullReferenceException || 
                ex is StackOverflowException ||
                ex is OutOfMemoryException   || 
                ex is System.Threading.ThreadAbortException; 
        }
 
        /// 
        /// 
        public static string StackTrace
        { 
            get
            { 
                return Environment.StackTrace; 
            }
        } 

        /// 
        ///   Returns information about the top stack frames in a string format.  The input param determines the number of
        ///   frames to include. 
        /// 
        public static string StackFramesToStr( int maxFrameCount ) 
        { 
            string trace = String.Empty;
 
            try
            {
                StackTrace st = new StackTrace( true );
                int dbgUtilFrameCount = 0; 

                // 
                // Ignore frames for methods on this library. 
                // Note: The stack frame holds the latest frame at index 0.
                // 
                while( dbgUtilFrameCount < st.FrameCount )
                {
                    StackFrame sf = st.GetFrame(dbgUtilFrameCount);
 
                    if( sf == null || sf.GetMethod().DeclaringType != typeof(DbgUtil) )
                    { 
                        break; 
                    }
 
                    dbgUtilFrameCount++;
                }

                maxFrameCount += dbgUtilFrameCount; // add ignored frames. 

                if( maxFrameCount > st.FrameCount ) 
                { 
                    maxFrameCount = st.FrameCount;
                } 

                for(int i = dbgUtilFrameCount; i < maxFrameCount; i++ )
                {
                    StackFrame sf = st.GetFrame(i); 

                    if( sf == null ) 
                    { 
                        continue;
                    } 

                    MethodBase mi = sf.GetMethod();

                    if( mi == null ) 
                    {
                        continue; 
                    } 

                    string args = String.Empty; 
                    string fileName = sf.GetFileName();

                    int backSlashIndex = fileName == null ? -1 : fileName.LastIndexOf( '\\' );
 
                    if( backSlashIndex != -1 )
                    { 
                        fileName = fileName.Substring( backSlashIndex + 1, fileName.Length - backSlashIndex - 1); 
                    }
 
                    foreach( ParameterInfo pi in mi.GetParameters() )
                    {
                        args += pi.ParameterType.Name + ", ";
                    } 

                    if( args.Length > 0 )   // remove last comma. 
                    { 
                        args = args.Substring(0, args.Length - 2);
                    } 

                    trace += String.Format(CultureInfo.CurrentCulture, "at {0}:{1} {2}.{3}({4})\r\n", fileName, sf.GetFileLineNumber(), mi.DeclaringType, mi.Name, args );
                }
            } 
            catch( Exception ex )
            { 
                if( DbgUtil.IsCriticalException(ex) ) 
                {
                    throw;  //rethrow critical exception. 
                }
                trace += ex.ToString();
            }
 
            return trace.ToString();
        } 
 
        /// 
        ///   Returns information about the top stack frames in a string format. 
        /// 
        public static string StackFramesToStr()
        {
            return StackFramesToStr( DbgUtil.gdipInitMaxFrameCount ); 
        }
 
        ///  
        ///   Returns information about the top stack frames in a string format.  The input param determines the number of
        ///   frames to include.  The 'message' parameter is used as the header of the returned string. 
        /// 
        public static string StackTraceToStr( string message, int frameCount )
        {
            return String.Format( CultureInfo.CurrentCulture, "{0}\r\nTop Stack Trace:\r\n{1}", message, DbgUtil.StackFramesToStr(frameCount)); 
        }
 
        ///  
        ///   Returns information about the top stack frames in a string format. The 'message' parameter is used as the header of the returned string.
        ///  
        public static string StackTraceToStr( string message )
        {
            return StackTraceToStr(message, DbgUtil.gdipInitMaxFrameCount );
        } 
    }
} 
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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