PeerToPeerException.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / SystemNet / Net / PeerToPeer / PeerToPeerException.cs / 1305376 / PeerToPeerException.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 
namespace System.Net.PeerToPeer
{ 
    using System; 
    using System.Collections.Generic;
    using System.Text; 
    using System.Runtime.InteropServices;
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis; 
    using System.Threading;
    using System.Runtime.Serialization; 
    using System.Security.Permissions; 

    ///  
    /// The PeerToPeerException class encpasulates the exceptions for
    /// PeerToPeer classes.
    /// NOTE:
    /// This class is marked serializable but does not implement 
    /// ISerializable interface. There are no private/public properties
    /// we keep track across the serialization. The base class message 
    /// and inner exceptions are used. 
    /// 
    [Serializable] 
    public class PeerToPeerException : Exception, ISerializable
    {
        private const UInt32 FACILITY_P2P = 99;
 

        public PeerToPeerException() { } 
 
        /// 
        /// Construtor 
        /// 
        /// 
        public PeerToPeerException(string message) : base(message) { }
 
        /// 
        /// Constructor 
        ///  
        /// 
        ///  
        public PeerToPeerException(string message, Exception innerException) : base(message, innerException) { }

        /// 
        /// HRESULT Structure 
        ///   3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
        ///   1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 
        ///  +---+-+-+-----------------------+-------------------------------+ 
        ///  |Sev|C|R|     Facility          |               Code            |
        ///  +---+-+-+-----------------------+-------------------------------+ 
        ///
        ///  The intent here is that when we get a HRESULT from a P2P.dll,
        ///  we need to get the message from the P2p.dll resource table.
        ///  If the HRESULT is something like E_INVALIDARG, we need to get the 
        ///  message from the SYSTEM table.
        ///  Apart from the native exception message, we would like to provide 
        ///  a friendly message to explain the context under which the exception 
        ///  occurred from managed code developers.
        ///  So we first try to get the message from the P2P.dll if the HRESULT 
        ///  comes with a facility ID for P2P. Otherwise we get the exception message from
        ///  system. We then construct a Win32Exception and set this as an inner exception
        ///
        ///  If in case we can't get the message from either system or P2p, then 
        ///  we try the Marshal class and throw a exception from the HRESULT
        /// 
        ///  If all else fails we simply throw an exception with no inner 
        ///  exception but still give the HRESULT
        /// 
        ///  A note that we are getting the handle for P2p.dll from the LoadLibrary
        ///  we originally did for checking if P2P.dll is present on the system.
        ///  Since we are getting the underlying handle, there is a possibility that
        /// the Library is freed [AppDomain shutdown] and we are trying to 
        ///  use the handle. The code is in a try catch block here so that
        ///  we catch these situations and still recover. 
        ///  
        /// The error message that we would like to set as the message for the exception///
        /// The error code 
        /// a PeerToPeerException
        // 
        // 
        //  
        // 
        //  
        //  
        // 
        //  
        [System.Security.SecurityCritical]
        internal static PeerToPeerException CreateFromHr(string message, Int32 hr)
        {
            PeerToPeerException p2pEx = null; 
            int facility = ((hr >> 16) & 0x1FFF);
            IntPtr NativeMessagePtr = IntPtr.Zero; 
            try 
            {
                UInt32 dwLength = UnsafeSystemNativeMethods.FormatMessage( 
                        FormatMessageFlags.FORMAT_MESSAGE_ALLOCATE_BUFFER |
                        FormatMessageFlags.FORMAT_MESSAGE_ARGUMENT_ARRAY |
                        (facility == FACILITY_P2P ? FormatMessageFlags.FORMAT_MESSAGE_FROM_HMODULE : FormatMessageFlags.FORMAT_MESSAGE_FROM_SYSTEM),
                        (facility == FACILITY_P2P ? PeerToPeerOSHelper.P2PModuleHandle : IntPtr.Zero), 
                        (uint)(hr),
                        0, 
                        ref NativeMessagePtr, 
                        0,
                        IntPtr.Zero); 
                if (dwLength != 0)
                {
                    string NativeMessage = Marshal.PtrToStringUni(NativeMessagePtr);
                    p2pEx = new PeerToPeerException(message, new Win32Exception(hr, NativeMessage)); 
                }
                else 
                { 
                    p2pEx = new PeerToPeerException(message, Marshal.GetExceptionForHR(hr));
                } 
            }
            catch(Exception ex)
            {
                Logging.P2PTraceSource.TraceEvent(TraceEventType.Warning, 0, "Could not get the error message for error code {0} - Exception {1}", hr, ex); 
                if (ex is ThreadAbortException || ex is StackOverflowException || ex is OutOfMemoryException)
                { 
                    throw; 
                }
            } 
            finally
            {
                if (NativeMessagePtr != IntPtr.Zero)
                { 
                    UnsafeSystemNativeMethods.LocalFree(NativeMessagePtr);
                } 
            } 
            if (p2pEx == null)
            { 
                Logging.P2PTraceSource.TraceEvent(TraceEventType.Warning, 0, "Could not get the error message for error code {0}", hr);
                p2pEx = new PeerToPeerException(message + "Underlying native error " + hr);
            }
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Error, 0, "Exception: {0}", p2pEx); 
            return p2pEx;
       } 
 
        protected PeerToPeerException(SerializationInfo info, StreamingContext context) : base (info, context) {}
        //  
        // 
        // 
        [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase", Justification = "System.Net.dll is still using pre-v4 security model and needs this demand")]
        [System.Security.SecurityCritical] 
        [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)]
        void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) { 
            GetObjectData(info, context); 
        }
        //  
        // 
        // 
        [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase", Justification = "System.Net.dll is still using pre-v4 security model and needs this demand")]
        [System.Security.SecurityCritical] 
        [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)]
        public override void GetObjectData(SerializationInfo info, StreamingContext context) 
        { 
            base.GetObjectData(info, context);
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 
namespace System.Net.PeerToPeer
{ 
    using System; 
    using System.Collections.Generic;
    using System.Text; 
    using System.Runtime.InteropServices;
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis; 
    using System.Threading;
    using System.Runtime.Serialization; 
    using System.Security.Permissions; 

    ///  
    /// The PeerToPeerException class encpasulates the exceptions for
    /// PeerToPeer classes.
    /// NOTE:
    /// This class is marked serializable but does not implement 
    /// ISerializable interface. There are no private/public properties
    /// we keep track across the serialization. The base class message 
    /// and inner exceptions are used. 
    /// 
    [Serializable] 
    public class PeerToPeerException : Exception, ISerializable
    {
        private const UInt32 FACILITY_P2P = 99;
 

        public PeerToPeerException() { } 
 
        /// 
        /// Construtor 
        /// 
        /// 
        public PeerToPeerException(string message) : base(message) { }
 
        /// 
        /// Constructor 
        ///  
        /// 
        ///  
        public PeerToPeerException(string message, Exception innerException) : base(message, innerException) { }

        /// 
        /// HRESULT Structure 
        ///   3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
        ///   1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 
        ///  +---+-+-+-----------------------+-------------------------------+ 
        ///  |Sev|C|R|     Facility          |               Code            |
        ///  +---+-+-+-----------------------+-------------------------------+ 
        ///
        ///  The intent here is that when we get a HRESULT from a P2P.dll,
        ///  we need to get the message from the P2p.dll resource table.
        ///  If the HRESULT is something like E_INVALIDARG, we need to get the 
        ///  message from the SYSTEM table.
        ///  Apart from the native exception message, we would like to provide 
        ///  a friendly message to explain the context under which the exception 
        ///  occurred from managed code developers.
        ///  So we first try to get the message from the P2P.dll if the HRESULT 
        ///  comes with a facility ID for P2P. Otherwise we get the exception message from
        ///  system. We then construct a Win32Exception and set this as an inner exception
        ///
        ///  If in case we can't get the message from either system or P2p, then 
        ///  we try the Marshal class and throw a exception from the HRESULT
        /// 
        ///  If all else fails we simply throw an exception with no inner 
        ///  exception but still give the HRESULT
        /// 
        ///  A note that we are getting the handle for P2p.dll from the LoadLibrary
        ///  we originally did for checking if P2P.dll is present on the system.
        ///  Since we are getting the underlying handle, there is a possibility that
        /// the Library is freed [AppDomain shutdown] and we are trying to 
        ///  use the handle. The code is in a try catch block here so that
        ///  we catch these situations and still recover. 
        ///  
        /// The error message that we would like to set as the message for the exception///
        /// The error code 
        /// a PeerToPeerException
        // 
        // 
        //  
        // 
        //  
        //  
        // 
        //  
        [System.Security.SecurityCritical]
        internal static PeerToPeerException CreateFromHr(string message, Int32 hr)
        {
            PeerToPeerException p2pEx = null; 
            int facility = ((hr >> 16) & 0x1FFF);
            IntPtr NativeMessagePtr = IntPtr.Zero; 
            try 
            {
                UInt32 dwLength = UnsafeSystemNativeMethods.FormatMessage( 
                        FormatMessageFlags.FORMAT_MESSAGE_ALLOCATE_BUFFER |
                        FormatMessageFlags.FORMAT_MESSAGE_ARGUMENT_ARRAY |
                        (facility == FACILITY_P2P ? FormatMessageFlags.FORMAT_MESSAGE_FROM_HMODULE : FormatMessageFlags.FORMAT_MESSAGE_FROM_SYSTEM),
                        (facility == FACILITY_P2P ? PeerToPeerOSHelper.P2PModuleHandle : IntPtr.Zero), 
                        (uint)(hr),
                        0, 
                        ref NativeMessagePtr, 
                        0,
                        IntPtr.Zero); 
                if (dwLength != 0)
                {
                    string NativeMessage = Marshal.PtrToStringUni(NativeMessagePtr);
                    p2pEx = new PeerToPeerException(message, new Win32Exception(hr, NativeMessage)); 
                }
                else 
                { 
                    p2pEx = new PeerToPeerException(message, Marshal.GetExceptionForHR(hr));
                } 
            }
            catch(Exception ex)
            {
                Logging.P2PTraceSource.TraceEvent(TraceEventType.Warning, 0, "Could not get the error message for error code {0} - Exception {1}", hr, ex); 
                if (ex is ThreadAbortException || ex is StackOverflowException || ex is OutOfMemoryException)
                { 
                    throw; 
                }
            } 
            finally
            {
                if (NativeMessagePtr != IntPtr.Zero)
                { 
                    UnsafeSystemNativeMethods.LocalFree(NativeMessagePtr);
                } 
            } 
            if (p2pEx == null)
            { 
                Logging.P2PTraceSource.TraceEvent(TraceEventType.Warning, 0, "Could not get the error message for error code {0}", hr);
                p2pEx = new PeerToPeerException(message + "Underlying native error " + hr);
            }
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Error, 0, "Exception: {0}", p2pEx); 
            return p2pEx;
       } 
 
        protected PeerToPeerException(SerializationInfo info, StreamingContext context) : base (info, context) {}
        //  
        // 
        // 
        [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase", Justification = "System.Net.dll is still using pre-v4 security model and needs this demand")]
        [System.Security.SecurityCritical] 
        [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)]
        void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) { 
            GetObjectData(info, context); 
        }
        //  
        // 
        // 
        [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase", Justification = "System.Net.dll is still using pre-v4 security model and needs this demand")]
        [System.Security.SecurityCritical] 
        [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)]
        public override void GetObjectData(SerializationInfo info, StreamingContext context) 
        { 
            base.GetObjectData(info, context);
        } 
    }
}

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