Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / AggregateException.cs / 1305376 / AggregateException.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
// =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
//
// AggregateException.cs
//
// [....]
//
// Public type to communicate multiple failures to an end-user.
//
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.Serialization;
using System.Security;
using System.Threading;
namespace System
{
/// Represents one or more errors that occur during application execution.
///
/// is used to consolidate multiple failures into a single, throwable
/// exception object.
///
[Serializable]
[DebuggerDisplay("Count = {InnerExceptions.Count}")]
public class AggregateException : Exception
{
private ReadOnlyCollection m_innerExceptions; // Complete set of exceptions.
///
/// Initializes a new instance of the class.
///
public AggregateException()
: base(Environment.GetResourceString("AggregateException_ctor_DefaultMessage"))
{
m_innerExceptions = new ReadOnlyCollection(new Exception[0]);
}
///
/// Initializes a new instance of the class with
/// a specified error message.
///
/// The error message that explains the reason for the exception.
public AggregateException(string message)
: base(message)
{
m_innerExceptions = new ReadOnlyCollection(new Exception[0]);
}
///
/// Initializes a new instance of the class with a specified error
/// message and a reference to the inner exception that is the cause of this exception.
///
/// The error message that explains the reason for the exception.
/// The exception that is the cause of the current exception.
/// The argument
/// is null.
public AggregateException(string message, Exception innerException)
: base(message, innerException)
{
if (innerException == null)
{
throw new ArgumentNullException("innerException");
}
m_innerExceptions = new ReadOnlyCollection(new Exception[] { innerException });
}
///
/// Initializes a new instance of the class with
/// references to the inner exceptions that are the cause of this exception.
///
/// The exceptions that are the cause of the current exception.
/// The argument
/// is null.
/// An element of is
/// null.
public AggregateException(IEnumerable innerExceptions) :
this(Environment.GetResourceString("AggregateException_ctor_DefaultMessage"), innerExceptions)
{
}
///
/// Initializes a new instance of the class with
/// references to the inner exceptions that are the cause of this exception.
///
/// The exceptions that are the cause of the current exception.
/// The argument
/// is null.
/// An element of is
/// null.
public AggregateException(params Exception[] innerExceptions) :
this(Environment.GetResourceString("AggregateException_ctor_DefaultMessage"), innerExceptions)
{
}
///
/// Initializes a new instance of the class with a specified error
/// message and references to the inner exceptions that are the cause of this exception.
///
/// The error message that explains the reason for the exception.
/// The exceptions that are the cause of the current exception.
/// The argument
/// is null.
/// An element of is
/// null.
public AggregateException(string message, IEnumerable innerExceptions)
: this(message, innerExceptions == null ? (List)null : new List(innerExceptions))
{
}
///
/// Initializes a new instance of the class with a specified error
/// message and references to the inner exceptions that are the cause of this exception.
///
/// The error message that explains the reason for the exception.
/// The exceptions that are the cause of the current exception.
/// The argument
/// is null.
/// An element of is
/// null.
public AggregateException(string message, params Exception[] innerExceptions) :
this(message, (IList)innerExceptions)
{
}
///
/// Allocates a new aggregate exception with the specified message and list of inner exceptions.
///
/// The error message that explains the reason for the exception.
/// The exceptions that are the cause of the current exception.
/// The argument
/// is null.
/// An element of is
/// null.
private AggregateException(string message, IList innerExceptions)
: base(message, innerExceptions != null && innerExceptions.Count > 0 ? innerExceptions[0] : null)
{
if (innerExceptions == null)
{
throw new ArgumentNullException("innerExceptions");
}
// Copy exceptions to our internal array and validate them. We must copy them,
// because we're going to put them into a ReadOnlyCollection which simply reuses
// the list passed in to it. We don't want callers subsequently mutating.
Exception[] exceptionsCopy = new Exception[innerExceptions.Count];
for (int i = 0; i < exceptionsCopy.Length; i++)
{
exceptionsCopy[i] = innerExceptions[i];
if (exceptionsCopy[i] == null)
{
throw new ArgumentException(Environment.GetResourceString("AggregateException_ctor_InnerExceptionNull"));
}
}
m_innerExceptions = new ReadOnlyCollection(exceptionsCopy);
}
///
/// Initializes a new instance of the class with serialized data.
///
/// The that holds
/// the serialized object data about the exception being thrown.
/// The that
/// contains contextual information about the source or destination.
/// The argument is null.
/// The exception could not be deserialized correctly.
[SecurityCritical]
protected AggregateException(SerializationInfo info, StreamingContext context) :
base(info, context)
{
if (info == null)
{
throw new ArgumentNullException("info");
}
Exception[] innerExceptions = info.GetValue("InnerExceptions", typeof(Exception[])) as Exception[];
if (innerExceptions == null)
{
throw new SerializationException(Environment.GetResourceString("AggregateException_DeserializationFailure"));
}
m_innerExceptions = new ReadOnlyCollection(innerExceptions);
}
///
/// Sets the with information about
/// the exception.
///
/// The that holds
/// the serialized object data about the exception being thrown.
/// The that
/// contains contextual information about the source or destination.
/// The argument is null.
[SecurityCritical]
public override void GetObjectData(SerializationInfo info, StreamingContext context)
{
if (info == null)
{
throw new ArgumentNullException("info");
}
base.GetObjectData(info, context);
Exception[] innerExceptions = new Exception[m_innerExceptions.Count];
m_innerExceptions.CopyTo(innerExceptions, 0);
info.AddValue("InnerExceptions", innerExceptions, typeof(Exception[]));
}
///
/// Returns the that is the root cause of this exception.
///
public override Exception GetBaseException()
{
// Returns the first inner AggregateException that contains more or less than one inner exception
// Recursively traverse the inner exceptions as long as the inner exception of type AggregateException and has only one inner exception
Exception back = this;
AggregateException backAsAggregate = this;
while (backAsAggregate != null && backAsAggregate.InnerExceptions.Count == 1)
{
back = back.InnerException;
backAsAggregate = back as AggregateException;
}
return back;
}
///
/// Gets a read-only collection of the instances that caused the
/// current exception.
///
public ReadOnlyCollection InnerExceptions
{
get { return m_innerExceptions; }
}
#if !FEATURE_CORECLR
///
/// Invokes a handler on each contained by this .
///
/// The predicate to execute for each exception. The predicate accepts as an
/// argument the to be processed and returns a Boolean to indicate
/// whether the exception was handled.
///
/// Each invocation of the returns true or false to indicate whether the
/// was handled. After all invocations, if any exceptions went
/// unhandled, all unhandled exceptions will be put into a new
/// which will be thrown. Otherwise, the method simply returns. If any
/// invocations of the throws an exception, it will halt the processing
/// of any more exceptions and immediately propagate the thrown exception as-is.
///
/// An exception contained by this was not handled.
/// The argument is
/// null.
public void Handle(Func predicate)
{
if (predicate == null)
{
throw new ArgumentNullException("predicate");
}
List unhandledExceptions = null;
for (int i = 0; i < m_innerExceptions.Count; i++)
{
// If the exception was not handled, lazily allocate a list of unhandled
// exceptions (to be rethrown later) and add it.
if (!predicate(m_innerExceptions[i]))
{
if (unhandledExceptions == null)
{
unhandledExceptions = new List();
}
unhandledExceptions.Add(m_innerExceptions[i]);
}
}
// If there are unhandled exceptions remaining, throw them.
if (unhandledExceptions != null)
{
throw new AggregateException(Message, unhandledExceptions);
}
}
#endif //!FEATURE_CORECLR
///
/// Flattens an instances into a single, new instance.
///
/// A new, flattened .
///
/// If any inner exceptions are themselves instances of
/// , this method will recursively flatten all of them. The
/// inner exceptions returned in the new
/// will be the union of all of the the inner exceptions from exception tree rooted at the provided
/// instance.
///
public AggregateException Flatten()
{
// Initialize a collection to contain the flattened exceptions.
List flattenedExceptions = new List();
// Create a list to remember all aggregates to be flattened, this will be accessed like a FIFO queue
List exceptionsToFlatten = new List();
exceptionsToFlatten.Add(this);
int nDequeueIndex = 0;
// Continue removing and recursively flattening exceptions, until there are no more.
while (exceptionsToFlatten.Count > nDequeueIndex)
{
// dequeue one from exceptionsToFlatten
IList currentInnerExceptions = exceptionsToFlatten[nDequeueIndex++].InnerExceptions;
for (int i = 0; i < currentInnerExceptions.Count; i++)
{
Exception currentInnerException = currentInnerExceptions[i];
if (currentInnerException == null)
{
continue;
}
AggregateException currentInnerAsAggregate = currentInnerException as AggregateException;
// If this exception is an aggregate, keep it around for later. Otherwise,
// simply add it to the list of flattened exceptions to be returned.
if (currentInnerAsAggregate != null)
{
exceptionsToFlatten.Add(currentInnerAsAggregate);
}
else
{
flattenedExceptions.Add(currentInnerException);
}
}
}
return new AggregateException(Message, flattenedExceptions);
}
///
/// Creates and returns a string representation of the current .
///
/// A string representation of the current exception.
public override string ToString()
{
string text = base.ToString();
for (int i = 0; i < m_innerExceptions.Count; i++)
{
text = String.Format(
CultureInfo.InvariantCulture,
Environment.GetResourceString("AggregateException_ToString"),
text, Environment.NewLine, i, m_innerExceptions[i].ToString(), "<---", Environment.NewLine);
}
return text;
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
// =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
//
// AggregateException.cs
//
// [....]
//
// Public type to communicate multiple failures to an end-user.
//
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.Serialization;
using System.Security;
using System.Threading;
namespace System
{
/// Represents one or more errors that occur during application execution.
///
/// is used to consolidate multiple failures into a single, throwable
/// exception object.
///
[Serializable]
[DebuggerDisplay("Count = {InnerExceptions.Count}")]
public class AggregateException : Exception
{
private ReadOnlyCollection m_innerExceptions; // Complete set of exceptions.
///
/// Initializes a new instance of the class.
///
public AggregateException()
: base(Environment.GetResourceString("AggregateException_ctor_DefaultMessage"))
{
m_innerExceptions = new ReadOnlyCollection(new Exception[0]);
}
///
/// Initializes a new instance of the class with
/// a specified error message.
///
/// The error message that explains the reason for the exception.
public AggregateException(string message)
: base(message)
{
m_innerExceptions = new ReadOnlyCollection(new Exception[0]);
}
///
/// Initializes a new instance of the class with a specified error
/// message and a reference to the inner exception that is the cause of this exception.
///
/// The error message that explains the reason for the exception.
/// The exception that is the cause of the current exception.
/// The argument
/// is null.
public AggregateException(string message, Exception innerException)
: base(message, innerException)
{
if (innerException == null)
{
throw new ArgumentNullException("innerException");
}
m_innerExceptions = new ReadOnlyCollection(new Exception[] { innerException });
}
///
/// Initializes a new instance of the class with
/// references to the inner exceptions that are the cause of this exception.
///
/// The exceptions that are the cause of the current exception.
/// The argument
/// is null.
/// An element of is
/// null.
public AggregateException(IEnumerable innerExceptions) :
this(Environment.GetResourceString("AggregateException_ctor_DefaultMessage"), innerExceptions)
{
}
///
/// Initializes a new instance of the class with
/// references to the inner exceptions that are the cause of this exception.
///
/// The exceptions that are the cause of the current exception.
/// The argument
/// is null.
/// An element of is
/// null.
public AggregateException(params Exception[] innerExceptions) :
this(Environment.GetResourceString("AggregateException_ctor_DefaultMessage"), innerExceptions)
{
}
///
/// Initializes a new instance of the class with a specified error
/// message and references to the inner exceptions that are the cause of this exception.
///
/// The error message that explains the reason for the exception.
/// The exceptions that are the cause of the current exception.
/// The argument
/// is null.
/// An element of is
/// null.
public AggregateException(string message, IEnumerable innerExceptions)
: this(message, innerExceptions == null ? (List)null : new List(innerExceptions))
{
}
///
/// Initializes a new instance of the class with a specified error
/// message and references to the inner exceptions that are the cause of this exception.
///
/// The error message that explains the reason for the exception.
/// The exceptions that are the cause of the current exception.
/// The argument
/// is null.
/// An element of is
/// null.
public AggregateException(string message, params Exception[] innerExceptions) :
this(message, (IList)innerExceptions)
{
}
///
/// Allocates a new aggregate exception with the specified message and list of inner exceptions.
///
/// The error message that explains the reason for the exception.
/// The exceptions that are the cause of the current exception.
/// The argument
/// is null.
/// An element of is
/// null.
private AggregateException(string message, IList innerExceptions)
: base(message, innerExceptions != null && innerExceptions.Count > 0 ? innerExceptions[0] : null)
{
if (innerExceptions == null)
{
throw new ArgumentNullException("innerExceptions");
}
// Copy exceptions to our internal array and validate them. We must copy them,
// because we're going to put them into a ReadOnlyCollection which simply reuses
// the list passed in to it. We don't want callers subsequently mutating.
Exception[] exceptionsCopy = new Exception[innerExceptions.Count];
for (int i = 0; i < exceptionsCopy.Length; i++)
{
exceptionsCopy[i] = innerExceptions[i];
if (exceptionsCopy[i] == null)
{
throw new ArgumentException(Environment.GetResourceString("AggregateException_ctor_InnerExceptionNull"));
}
}
m_innerExceptions = new ReadOnlyCollection(exceptionsCopy);
}
///
/// Initializes a new instance of the class with serialized data.
///
/// The that holds
/// the serialized object data about the exception being thrown.
/// The that
/// contains contextual information about the source or destination.
/// The argument is null.
/// The exception could not be deserialized correctly.
[SecurityCritical]
protected AggregateException(SerializationInfo info, StreamingContext context) :
base(info, context)
{
if (info == null)
{
throw new ArgumentNullException("info");
}
Exception[] innerExceptions = info.GetValue("InnerExceptions", typeof(Exception[])) as Exception[];
if (innerExceptions == null)
{
throw new SerializationException(Environment.GetResourceString("AggregateException_DeserializationFailure"));
}
m_innerExceptions = new ReadOnlyCollection(innerExceptions);
}
///
/// Sets the with information about
/// the exception.
///
/// The that holds
/// the serialized object data about the exception being thrown.
/// The that
/// contains contextual information about the source or destination.
/// The argument is null.
[SecurityCritical]
public override void GetObjectData(SerializationInfo info, StreamingContext context)
{
if (info == null)
{
throw new ArgumentNullException("info");
}
base.GetObjectData(info, context);
Exception[] innerExceptions = new Exception[m_innerExceptions.Count];
m_innerExceptions.CopyTo(innerExceptions, 0);
info.AddValue("InnerExceptions", innerExceptions, typeof(Exception[]));
}
///
/// Returns the that is the root cause of this exception.
///
public override Exception GetBaseException()
{
// Returns the first inner AggregateException that contains more or less than one inner exception
// Recursively traverse the inner exceptions as long as the inner exception of type AggregateException and has only one inner exception
Exception back = this;
AggregateException backAsAggregate = this;
while (backAsAggregate != null && backAsAggregate.InnerExceptions.Count == 1)
{
back = back.InnerException;
backAsAggregate = back as AggregateException;
}
return back;
}
///
/// Gets a read-only collection of the instances that caused the
/// current exception.
///
public ReadOnlyCollection InnerExceptions
{
get { return m_innerExceptions; }
}
#if !FEATURE_CORECLR
///
/// Invokes a handler on each contained by this .
///
/// The predicate to execute for each exception. The predicate accepts as an
/// argument the to be processed and returns a Boolean to indicate
/// whether the exception was handled.
///
/// Each invocation of the returns true or false to indicate whether the
/// was handled. After all invocations, if any exceptions went
/// unhandled, all unhandled exceptions will be put into a new
/// which will be thrown. Otherwise, the method simply returns. If any
/// invocations of the throws an exception, it will halt the processing
/// of any more exceptions and immediately propagate the thrown exception as-is.
///
/// An exception contained by this was not handled.
/// The argument is
/// null.
public void Handle(Func predicate)
{
if (predicate == null)
{
throw new ArgumentNullException("predicate");
}
List unhandledExceptions = null;
for (int i = 0; i < m_innerExceptions.Count; i++)
{
// If the exception was not handled, lazily allocate a list of unhandled
// exceptions (to be rethrown later) and add it.
if (!predicate(m_innerExceptions[i]))
{
if (unhandledExceptions == null)
{
unhandledExceptions = new List();
}
unhandledExceptions.Add(m_innerExceptions[i]);
}
}
// If there are unhandled exceptions remaining, throw them.
if (unhandledExceptions != null)
{
throw new AggregateException(Message, unhandledExceptions);
}
}
#endif //!FEATURE_CORECLR
///
/// Flattens an instances into a single, new instance.
///
/// A new, flattened .
///
/// If any inner exceptions are themselves instances of
/// , this method will recursively flatten all of them. The
/// inner exceptions returned in the new
/// will be the union of all of the the inner exceptions from exception tree rooted at the provided
/// instance.
///
public AggregateException Flatten()
{
// Initialize a collection to contain the flattened exceptions.
List flattenedExceptions = new List();
// Create a list to remember all aggregates to be flattened, this will be accessed like a FIFO queue
List exceptionsToFlatten = new List();
exceptionsToFlatten.Add(this);
int nDequeueIndex = 0;
// Continue removing and recursively flattening exceptions, until there are no more.
while (exceptionsToFlatten.Count > nDequeueIndex)
{
// dequeue one from exceptionsToFlatten
IList currentInnerExceptions = exceptionsToFlatten[nDequeueIndex++].InnerExceptions;
for (int i = 0; i < currentInnerExceptions.Count; i++)
{
Exception currentInnerException = currentInnerExceptions[i];
if (currentInnerException == null)
{
continue;
}
AggregateException currentInnerAsAggregate = currentInnerException as AggregateException;
// If this exception is an aggregate, keep it around for later. Otherwise,
// simply add it to the list of flattened exceptions to be returned.
if (currentInnerAsAggregate != null)
{
exceptionsToFlatten.Add(currentInnerAsAggregate);
}
else
{
flattenedExceptions.Add(currentInnerException);
}
}
}
return new AggregateException(Message, flattenedExceptions);
}
///
/// Creates and returns a string representation of the current .
///
/// A string representation of the current exception.
public override string ToString()
{
string text = base.ToString();
for (int i = 0; i < m_innerExceptions.Count; i++)
{
text = String.Format(
CultureInfo.InvariantCulture,
Environment.GetResourceString("AggregateException_ToString"),
text, Environment.NewLine, i, m_innerExceptions[i].ToString(), "<---", Environment.NewLine);
}
return text;
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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