Utility.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / SMDiagnostics / System / ServiceModel / Diagnostics / Utility.cs / 2 / Utility.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.ServiceModel.Diagnostics 
{
    using System.Runtime.CompilerServices; 
    using System.Runtime.ConstrainedExecution; 
    using System.Diagnostics;
    using System.Threading; 
    using System.Runtime.InteropServices;
    using System.Security;
    using System.Security.Permissions;
    using System.Diagnostics.CodeAnalysis; 

    class Utility 
    { 
        ExceptionUtility exceptionUtility;
 
        [Obsolete("For SMDiagnostics.dll use only. Call DiagnosticUtility.Utility instead")]
        internal Utility(ExceptionUtility exceptionUtility)
        {
            this.exceptionUtility = exceptionUtility; 
        }
 
        ExceptionUtility ExceptionUtility 
        {
            [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
            get
            {
                return this.exceptionUtility;
            } 
        }
 
 
        // Call this when a p/invoke with an 'out SafeHandle' parameter returns an error.  This will safely clean up the handle.
        internal static void CloseInvalidOutSafeHandle(SafeHandle handle) 
        {
            // Workaround for 64-bit CLR bug VSWhidbey 546830 - sometimes invalid SafeHandles come back null.
            if (handle != null)
            { 
#pragma warning disable 618
                AssertUtility.DebugAssert(handle.IsInvalid, "CloseInvalidOutSafeHandle called with a valid handle!"); 
#pragma warning restore 618 

                // Calls SuppressFinalize. 
                handle.SetHandleAsInvalid();
            }
        }
 
        // Same as CloseInvalidOutSafeHandle but marked SecurityCritical for use in PT scenarios
        ///  
        /// Critical - calls SetHandleAsInvalid which has a LinkDemand for UnmanagedCode 
        /// 
        [SecurityCritical] 
        internal static void CloseInvalidOutSafeHandleCritical(SafeHandle handle)
        {
            // Workaround for 64-bit CLR bug VSWhidbey 546830 - sometimes invalid SafeHandles come back null.
            if (handle != null) 
            {
#pragma warning disable 618 
                AssertUtility.DebugAssert(handle.IsInvalid, "CloseInvalidOutSafeHandle called with a valid handle!"); 
#pragma warning restore 618
 
                // Calls SuppressFinalize.
                handle.SetHandleAsInvalid();
            }
        } 

        // Copy of the above for CriticalHandles. 
        internal static void CloseInvalidOutCriticalHandle(CriticalHandle handle) 
        {
            if (handle != null) 
            {
#pragma warning disable 618
                AssertUtility.DebugAssert(handle.IsInvalid, "CloseInvalidOutCriticalHandle called with a valid handle!");
#pragma warning restore 618 

                handle.SetHandleAsInvalid(); 
            } 
        }
 
        [SuppressMessage("Reliability", "Reliability113", Justification = "These are the core methods that should be used for all other Guid(string) calls.")]
        internal Guid CreateGuid(string guidString)
        {
            bool success = false; 
            Guid result = Guid.Empty;
 
            try 
            {
                result = new Guid(guidString); 
                success = true;
            }
            finally
            { 
                if (!success)
                { 
#pragma warning disable 618 
                    AssertUtility.DebugAssert(false, "Creation of the Guid failed.");
#pragma warning restore 618 
                }
            }

            return result; 
        }
 
        [SuppressMessage("Reliability", "Reliability113", Justification = "These are the core methods that should be used for all other Guid(string) calls.")] 
        internal bool TryCreateGuid(string guidString, out Guid result)
        { 
            bool success = false;
            result = Guid.Empty;

            try 
            {
                result = new Guid(guidString); 
                success = true; 
            }
            catch (ArgumentException e) 
            {
                // ignore this
                ExceptionUtility.TraceHandledException(e, TraceEventType.Warning);
            } 
            catch (FormatException e)
            { 
                // ignore this 
                ExceptionUtility.TraceHandledException(e, TraceEventType.Warning);
            } 
            catch (OverflowException e)
            {
                // ignore this
                ExceptionUtility.TraceHandledException(e, TraceEventType.Warning); 
            }
 
            return success; 
        }
 
        internal byte[] AllocateByteArray(int size)
        {
            try
            { 
                // Safe to catch OOM from this as long as the ONLY thing it does is a simple allocation of a primitive type (no method calls).
                return new byte[size]; 
            } 
            catch (OutOfMemoryException exception)
            { 
                // Convert OOM into an exception that can be safely handled by higher layers.
                throw ExceptionUtility.ThrowHelperError(new InsufficientMemoryException(TraceSR.GetString(
                    TraceSR.BufferAllocationFailed, size), exception));
            } 
        }
 
        internal char[] AllocateCharArray(int size) 
        {
            try 
            {
                // Safe to catch OOM from this as long as the ONLY thing it does is a simple allocation of a primitive type (no method calls).
                return new char[size];
            } 
            catch (OutOfMemoryException exception)
            { 
                // Convert OOM into an exception that can be safely handled by higher layers. 
                throw ExceptionUtility.ThrowHelperError(new InsufficientMemoryException(TraceSR.GetString(
                    TraceSR.BufferAllocationFailed, size * sizeof(char)), exception)); 
            }
        }

        ///  
        /// Critical - sets up a callback with a CER, must guard utility argument (in this case, 'this')
        /// Safe - safe for callers 
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        internal AsyncCallback ThunkCallback(AsyncCallback callback) 
        {
            return (new AsyncThunk(callback, this)).ThunkFrame;
        }
 
        /// 
        /// Critical - sets up a callback with a CER, must guard utility argument (in this case, 'this') 
        /// Safe - safe for callers 
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        internal TimerCallback ThunkCallback(TimerCallback callback)
        {
            return (new TimerThunk(callback, this)).ThunkFrame;
        } 

        ///  
        /// Critical - sets up a callback with a CER, must guard utility argument (in this case, 'this') 
        /// Safe - safe for callers
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        internal WaitOrTimerCallback ThunkCallback(WaitOrTimerCallback callback)
        {
            return (new WaitOrTimerThunk(callback, this)).ThunkFrame; 
        }
 
        ///  
        /// Critical - sets up a callback with a CER, must guard utility argument (in this case, 'this')
        /// Safe - safe for callers 
        /// 
        [SecurityCritical, SecurityTreatAsSafe]
        internal IOCompletionCallback ThunkCallback(IOCompletionCallback callback)
        { 
            return (new IOCompletionThunk(callback, this)).ThunkFrame;
        } 
 
        /// 
        /// Critical - sets up a callback with a CER, must guard utility argument (in this case, 'this') 
        /// Safe - safe for callers
        /// 
        [SecurityCritical, SecurityTreatAsSafe]
        internal WaitCallback ThunkCallback(WaitCallback callback) 
        {
            return (new WaitThunk(callback, this)).ThunkFrame; 
        } 

        ///  
        /// Critical - stores the utility parameter for derived classes
        /// 
        [SecurityCritical(SecurityCriticalScope.Everything)]
        class Thunk where T : class 
        {
            protected T callback; 
            protected Utility utility; 

            public Thunk(T callback, Utility utility) 
            {
#pragma warning disable 618
                AssertUtility.DebugAssert(utility != null, "Null utility passed to Thunk.");
                AssertUtility.DebugAssert(callback != null, "Null callback passed to Thunk."); 
#pragma warning restore 618
                this.callback = callback; 
                this.utility = utility; 
            }
        } 

        /// 
        /// Critical - uses RuntimeHelpers.PrepareConstrainedRegions which has a LinkDemand for UnmanagedCode
        ///             caller must guard utility parameter -- calls from catch/finally block have special requirements 
        /// 
        [SecurityCritical(SecurityCriticalScope.Everything)] 
        sealed class AsyncThunk : Thunk 
        {
            public AsyncThunk(AsyncCallback callback, Utility utility) : base(callback, utility) { } 

            public AsyncCallback ThunkFrame
            {
                get 
                {
                    return new AsyncCallback(UnhandledExceptionFrame); 
                } 
            }
 
            void UnhandledExceptionFrame(IAsyncResult result)
            {
                RuntimeHelpers.PrepareConstrainedRegions();
                try 
                {
                    this.callback(result); 
                } 
                catch (Exception exception)
                { 
                    if (!this.utility.HandleAtThreadBase(exception))
                    {
                        throw;
                    } 
                }
            } 
        } 

        ///  
        /// Critical - uses RuntimeHelpers.PrepareConstrainedRegions which has a LinkDemand for UnmanagedCode
        ///             caller must guard utility parameter -- calls from catch/finally block have special requirements
        /// 
        [SecurityCritical(SecurityCriticalScope.Everything)] 
        sealed class TimerThunk : Thunk
        { 
            public TimerThunk(TimerCallback callback, Utility utility) : base(callback, utility) { } 

            public TimerCallback ThunkFrame 
            {
                get
                {
                    return new TimerCallback(UnhandledExceptionFrame); 
                }
            } 
 
            void UnhandledExceptionFrame(object state)
            { 
                RuntimeHelpers.PrepareConstrainedRegions();
                try
                {
                    this.callback(state); 
                }
                catch (Exception exception) 
                { 
                    if (!this.utility.HandleAtThreadBase(exception))
                    { 
                        throw;
                    }
                }
            } 
        }
 
        ///  
        /// Critical - uses RuntimeHelpers.PrepareConstrainedRegions which has a LinkDemand for UnmanagedCode
        ///             caller must guard utility parameter -- calls from catch/finally block have special requirements 
        /// 
        [SecurityCritical(SecurityCriticalScope.Everything)]
        sealed class WaitOrTimerThunk : Thunk
        { 
            public WaitOrTimerThunk(WaitOrTimerCallback callback, Utility utility) : base(callback, utility) { }
 
            public WaitOrTimerCallback ThunkFrame 
            {
                get 
                {
                    return new WaitOrTimerCallback(UnhandledExceptionFrame);
                }
            } 

            void UnhandledExceptionFrame(object state, bool timedOut) 
            { 
                RuntimeHelpers.PrepareConstrainedRegions();
                try 
                {
                    this.callback(state, timedOut);
                }
                catch (Exception exception) 
                {
                    if (!this.utility.HandleAtThreadBase(exception)) 
                    { 
                        throw;
                    } 
                }
            }
        }
 
        /// 
        /// Critical - uses RuntimeHelpers.PrepareConstrainedRegions which has a LinkDemand for UnmanagedCode 
        ///             caller must guard utility parameter -- calls from catch/finally block have special requirements 
        /// 
        [SecurityCritical(SecurityCriticalScope.Everything)] 
        unsafe sealed class IOCompletionThunk
        {
            IOCompletionCallback callback;
            Utility utility; 

            public IOCompletionThunk(IOCompletionCallback callback, Utility utility) 
            { 
#pragma warning disable 618
                AssertUtility.DebugAssert(utility != null, "Null utility passed to Thunk."); 
                AssertUtility.DebugAssert(callback != null, "Null callback passed to Thunk.");
#pragma warning restore 618
                this.callback = callback;
                this.utility = utility; 
            }
 
            public IOCompletionCallback ThunkFrame 
            {
                get 
                {
                    return new IOCompletionCallback(UnhandledExceptionFrame);
                }
            } 

            void UnhandledExceptionFrame(uint error, uint bytesRead, NativeOverlapped* nativeOverlapped) 
            { 
                RuntimeHelpers.PrepareConstrainedRegions();
                try 
                {
                    this.callback(error, bytesRead, nativeOverlapped);
                }
                catch (Exception exception) 
                {
                    if (!this.utility.HandleAtThreadBase(exception)) 
                    { 
                        throw;
                    } 
                }
            }
        }
 
        /// 
        /// Critical - uses RuntimeHelpers.PrepareConstrainedRegions which has a LinkDemand for UnmanagedCode 
        ///             caller must guard utility parameter -- calls from catch/finally block have special requirements 
        /// 
        [SecurityCritical(SecurityCriticalScope.Everything)] 
        sealed class WaitThunk : Thunk
        {
            public WaitThunk(WaitCallback callback, Utility utility) : base(callback, utility) { }
 
            public WaitCallback ThunkFrame
            { 
                get 
                {
                    return new WaitCallback(UnhandledExceptionFrame); 
                }
            }

            void UnhandledExceptionFrame(object state) 
            {
                RuntimeHelpers.PrepareConstrainedRegions(); 
                try 
                {
                    this.callback(state); 
                }
                catch (Exception exception)
                {
                    if (!this.utility.HandleAtThreadBase(exception)) 
                    {
                        throw; 
                    } 
                }
            } 
        }

        /// 
        ///   RequiresReview - does an InheritanceDemand because this method is called within a CER 
        ///                    the method must not be overridden by PT code or allowed to call into PT code
        ///  
        [SecurityRequiresReview] 
        [SecurityPermission(SecurityAction.InheritanceDemand, UnmanagedCode=true)]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)] 
        internal virtual bool CallHandler(Exception exception)
        {
            return false;
        } 

        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
        void TraceExceptionNoThrow(Exception exception, TraceEventType eventType) 
        {
            try 
            {
                // This call exits the CER.  However, when still inside a catch, normal ThreadAbort is prevented.
                // Rude ThreadAbort will still be allowed to terminate processing.
                ExceptionUtility.TraceHandledException(exception, eventType); 
            }
#pragma warning suppress 56500 
            catch 
            {
            } 
        }

        // Returns true if the exception is handled.
        ///  
        ///    RequiresReview - must not call into PT code as it is called within a CER
        ///  
        [SecurityRequiresReview] 
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        bool HandleAtThreadBase(Exception exception) 
        {
            // These exceptions have to do with thread control.  Let them go through unimpeded.
            if (ExceptionUtility.IsInfrastructureException(exception))
            { 
                TraceExceptionNoThrow(exception, TraceEventType.Warning);
                return false; 
            } 

            TraceExceptionNoThrow(exception, TraceEventType.Critical); 

            try
            {
                return CallHandler(exception); 
            }
#pragma warning suppress 56500 // covered by FXCop 
            catch (Exception secondException) 
            {
                // Don't let a new exception hide the original exception. 
                TraceExceptionNoThrow(secondException, TraceEventType.Error);
            }

            return false; 
        }
    } 
} 

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