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AggregateException.xml
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AggregateException.xml
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<Type Name="AggregateException" FullName="System.AggregateException">
<TypeSignature Language="C#" Value="public class AggregateException : Exception" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit AggregateException extends System.Exception" FrameworkAlternate="dotnet-uwp-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="DocId" Value="T:System.AggregateException" />
<TypeSignature Language="VB.NET" Value="Public Class AggregateException
Inherits Exception" />
<TypeSignature Language="F#" Value="type AggregateException = class
 inherit Exception" />
<TypeSignature Language="C++ CLI" Value="public ref class AggregateException : Exception" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi serializable beforefieldinit AggregateException extends System.Exception" FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<AssemblyInfo>
<AssemblyName>System.Threading.Tasks</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<TypeForwardingChain>
<TypeForwarding From="mscorlib" FromVersion="4.0.0.0" To="System.Threading.Tasks" ToVersion="0.0.0.0" FrameworkAlternate="dotnet-uwp-10.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="System.Threading.Tasks" FromVersion="5.0.0.0" To="System.Runtime" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="System.Threading.Tasks" FromVersion="6.0.0.0" To="System.Runtime" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="System.Threading.Tasks" FromVersion="7.0.0.0" To="System.Runtime" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="System.Threading.Tasks" FromVersion="8.0.0.0" To="System.Runtime" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
<TypeForwarding From="System.Threading.Tasks" FromVersion="9.0.0.0" To="System.Runtime" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
<TypeForwarding From="System.Threading.Tasks" FromVersion="4.1.0.0" To="System.Runtime" ToVersion="4.2.0.0" FrameworkAlternate="netcore-2.0" />
<TypeForwarding From="System.Threading.Tasks" FromVersion="4.1.1.0" To="System.Runtime" ToVersion="4.2.1.0" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0" />
<TypeForwarding From="System.Threading.Tasks" FromVersion="4.1.2.0" To="System.Runtime" ToVersion="4.2.2.0" FrameworkAlternate="netcore-3.1" />
</TypeForwardingChain>
<Base>
<BaseTypeName>System.Exception</BaseTypeName>
</Base>
<Interfaces />
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(0)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.Nullable(0)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(1)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(1)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-4.0">
<AttributeName Language="C#">[System.Diagnostics.DebuggerDisplay("Count = {InnerExceptions.Count}")]</AttributeName>
<AttributeName Language="F#">[<System.Diagnostics.DebuggerDisplay("Count = {InnerExceptions.Count}")>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Serializable]</AttributeName>
<AttributeName Language="F#">[<System.Serializable>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Diagnostics.DebuggerDisplay("Count = {InnerExceptionCount}")]</AttributeName>
<AttributeName Language="F#">[<System.Diagnostics.DebuggerDisplay("Count = {InnerExceptionCount}")>]</AttributeName>
</Attribute>
</Attributes>
<Docs>
<summary>Represents one or more errors that occur during application execution.</summary>
<remarks>
<format type="text/markdown">< and [Parallel LINQ (PLINQ)](/dotnet/standard/parallel-programming/parallel-linq-plinq). For more information, see [Exception Handling](/dotnet/standard/parallel-programming/exception-handling-task-parallel-library) and [How to: Handle Exceptions in a PLINQ Query](/dotnet/standard/parallel-programming/how-to-handle-exceptions-in-a-plinq-query). For additional information, see the [Aggregating Exceptions](https://learn.microsoft.com/archive/msdn-magazine/2009/brownfield/aggregating-exceptions) entry in the .NET Matters blog.
## Examples
The following example catches the <xref:System.AggregateException> exception and calls the <xref:System.AggregateException.Handle%2A> method to handle each exception it contains. Compiling and running the example with the first `task1` variable should result in an <xref:System.AggregateException> object that contains an <xref:System.UnauthorizedAccessException> exception. Commenting out that line, uncommenting the second `task1` variable, and compiling and running the example produces an <xref:System.AggregateException> object that contains an <xref:System.IndexOutOfRangeException> exception.
:::code language="csharp" source="~/snippets/csharp/System/AggregateException/Overview/exception1.cs" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_CLR_System/system.aggregateexception.class/fs/exception1.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.aggregateexception.class/vb/exception1.vb" id="Snippet1":::
]]></format>
</remarks>
<threadsafe>All public and protected members of <see cref="T:System.AggregateException" /> are thread-safe and may be used concurrently from multiple threads.</threadsafe>
</Docs>
<Members>
<MemberGroup MemberName=".ctor">
<AssemblyInfo>
<AssemblyName>System.Threading.Tasks</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.AggregateException" /> class.</summary>
</Docs>
</MemberGroup>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public AggregateException ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor() cil managed" />
<MemberSignature Language="DocId" Value="M:System.AggregateException.#ctor" />
<MemberSignature Language="VB.NET" Value="Public Sub New ()" />
<MemberSignature Language="C++ CLI" Value="public:
 AggregateException();" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.Threading.Tasks</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Parameters />
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.AggregateException" /> class with a system-supplied message that describes the error.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This constructor initializes the <xref:System.Exception.Message%2A> property of the new instance to a system-supplied message that describes the error, such as "System.AggregateException: One or more errors occurred." This message takes into account the current system culture.
The following table shows the initial property values for an instance of <xref:System.AggregateException>.
|Property|Value|
|--------------|-----------|
|<xref:System.Exception.InnerException%2A>|`null`.|
|<xref:System.Exception.Message%2A>|The localized error message string.|
]]></format>
</remarks>
<related type="Article" href="/dotnet/standard/exceptions/">Handling and Throwing Exceptions</related>
</Docs>
</Member>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public AggregateException (System.Collections.Generic.IEnumerable<Exception> innerExceptions);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(class System.Collections.Generic.IEnumerable`1<class System.Exception> innerExceptions) cil managed" />
<MemberSignature Language="DocId" Value="M:System.AggregateException.#ctor(System.Collections.Generic.IEnumerable{System.Exception})" />
<MemberSignature Language="VB.NET" Value="Public Sub New (innerExceptions As IEnumerable(Of Exception))" />
<MemberSignature Language="F#" Value="new AggregateException : seq<Exception> -> AggregateException" Usage="new System.AggregateException innerExceptions" />
<MemberSignature Language="C++ CLI" Value="public:
 AggregateException(System::Collections::Generic::IEnumerable<Exception ^> ^ innerExceptions);" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.Threading.Tasks</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Parameters>
<Parameter Name="innerExceptions" Type="System.Collections.Generic.IEnumerable<System.Exception>" />
</Parameters>
<Docs>
<param name="innerExceptions">The exceptions that are the cause of the current exception.</param>
<summary>Initializes a new instance of the <see cref="T:System.AggregateException" /> class with references to the inner exceptions that are the cause of this exception.</summary>
<remarks>To be added.</remarks>
<exception cref="T:System.ArgumentNullException">The <paramref name="innerExceptions" /> argument is null.</exception>
<exception cref="T:System.ArgumentException">An element of <paramref name="innerExceptions" /> is null.</exception>
</Docs>
</Member>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public AggregateException (params Exception[] innerExceptions);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(class System.Exception[] innerExceptions) cil managed" />
<MemberSignature Language="DocId" Value="M:System.AggregateException.#ctor(System.Exception[])" />
<MemberSignature Language="VB.NET" Value="Public Sub New (ParamArray innerExceptions As Exception())" />
<MemberSignature Language="F#" Value="new AggregateException : Exception[] -> AggregateException" Usage="new System.AggregateException innerExceptions" />
<MemberSignature Language="C++ CLI" Value="public:
 AggregateException(... cli::array <Exception ^> ^ innerExceptions);" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.Threading.Tasks</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
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<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
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<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
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<AssemblyInfo>
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<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Parameters>
<Parameter Name="innerExceptions" Type="System.Exception[]">
<Attributes>
<Attribute>
<AttributeName Language="C#">[System.ParamArray]</AttributeName>
<AttributeName Language="F#">[<System.ParamArray>]</AttributeName>
</Attribute>
</Attributes>
</Parameter>
</Parameters>
<Docs>
<param name="innerExceptions">The exceptions that are the cause of the current exception.</param>
<summary>Initializes a new instance of the <see cref="T:System.AggregateException" /> class with references to the inner exceptions that are the cause of this exception.</summary>
<remarks>To be added.</remarks>
<exception cref="T:System.ArgumentNullException">The <paramref name="innerExceptions" /> argument is null.</exception>
<exception cref="T:System.ArgumentException">An element of <paramref name="innerExceptions" /> is null.</exception>
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<param name="message">The message that describes the exception. The caller of this constructor is required to ensure that this string has been localized for the current system culture.</param>
<summary>Initializes a new instance of the <see cref="T:System.AggregateException" /> class with a specified message that describes the error.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The following table shows the initial property values for an instance of <xref:System.AggregateException>.
|Property|Value|
|--------------|-----------|
|<xref:System.Exception.InnerException%2A>|`null`.|
|<xref:System.Exception.Message%2A>|The error message string specified in `message`.|
]]></format>
</remarks>
<related type="Article" href="/dotnet/standard/exceptions/">Handling and Throwing Exceptions</related>
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<Parameter Name="context" Type="System.Runtime.Serialization.StreamingContext" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
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<Docs>
<param name="info">The object that holds the serialized object data.</param>
<param name="context">The contextual information about the source or destination.</param>
<summary>Initializes a new instance of the <see cref="T:System.AggregateException" /> class with serialized data.</summary>
<remarks>
<format type="text/markdown"><.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">The <paramref name="info" /> argument is null.</exception>
<exception cref="T:System.Runtime.Serialization.SerializationException">The exception could not be deserialized correctly.</exception>
<related type="Article" href="/dotnet/standard/serialization/xml-and-soap-serialization">XML and SOAP Serialization</related>
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<param name="message">The error message that explains the reason for the exception.</param>
<param name="innerExceptions">The exceptions that are the cause of the current exception.</param>
<summary>Initializes a new instance of the <see cref="T:System.AggregateException" /> class with a specified error message and references to the inner exceptions that are the cause of this exception.</summary>
<remarks>To be added.</remarks>
<exception cref="T:System.ArgumentNullException">The <paramref name="innerExceptions" /> argument is null.</exception>
<exception cref="T:System.ArgumentException">An element of <paramref name="innerExceptions" /> is null.</exception>
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<Parameter Name="innerException" Type="System.Exception" />
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<param name="message">The message that describes the exception. The caller of this constructor is required to ensure that this string has been localized for the current system culture.</param>
<param name="innerException">The exception that is the cause of the current exception. If the <paramref name="innerException" /> parameter is not <see langword="null" />, the current exception is raised in a <see langword="catch" /> block that handles the inner exception.</param>
<summary>Initializes a new instance of the <see cref="T:System.AggregateException" /> class with a specified error message and a reference to the inner exception that is the cause of this exception.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
An exception that is thrown as a direct result of a previous exception should include a reference to the previous exception in the <xref:System.Exception.InnerException%2A> property. The <xref:System.Exception.InnerException%2A> property returns the same value that is passed into the constructor, or `null` if the <xref:System.Exception.InnerException%2A> property does not supply the inner exception value to the constructor.
The following table shows the initial property values for an instance of <xref:System.AggregateException>.
|Property|Value|
|--------------|-----------|
|<xref:System.Exception.InnerException%2A>|`null`.|
|<xref:System.Exception.Message%2A>|The error message string specified in `message`.|
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">The <paramref name="innerException" /> argument is null.</exception>
<related type="Article" href="/dotnet/standard/exceptions/">Handling and Throwing Exceptions</related>
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<param name="message">The error message that explains the reason for the exception.</param>
<param name="innerExceptions">The exceptions that are the cause of the current exception.</param>
<summary>Initializes a new instance of the <see cref="T:System.AggregateException" /> class with a specified error message and references to the inner exceptions that are the cause of this exception.</summary>
<remarks>To be added.</remarks>
<exception cref="T:System.ArgumentNullException">The <paramref name="innerExceptions" /> argument is null.</exception>
<exception cref="T:System.ArgumentException">An element of <paramref name="innerExceptions" /> is null.</exception>
</Docs>
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<Member MemberName="Flatten">
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<MemberSignature Language="C++ CLI" Value="public:
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<MemberType>Method</MemberType>
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<ReturnValue>
<ReturnType>System.AggregateException</ReturnType>
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<Parameters />
<Docs>
<summary>Flattens an <see cref="T:System.AggregateException" /> instances into a single, new instance.</summary>
<returns>A new, flattened <see cref="T:System.AggregateException" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
If a task has an attached child task that throws an exception, that exception is wrapped in an <xref:System.AggregateException> exception before it is propagated to the parent task, which wraps that exception in its own <xref:System.AggregateException> exception before it propagates it back to the calling thread. In such cases, the <xref:System.AggregateException.InnerExceptions%2A> property of the <xref:System.AggregateException> exception that is caught by the <xref:System.Threading.Tasks.Task.Wait%2A?displayProperty=nameWithType>, <xref:System.Threading.Tasks.Task.Wait*>, <xref:System.Threading.Tasks.Task.WaitAny%2A?displayProperty=nameWithType> or <xref:System.Threading.Tasks.Task.WaitAll%2A?displayProperty=nameWithType> method contains one or more <xref:System.AggregateException> instances, not the original exceptions that caused the fault. To avoid having to iterate over nested <xref:System.AggregateException> exceptions, you can use the <xref:System.AggregateException.Flatten%2A> method to remove all the nested <xref:System.AggregateException> exceptions, so that the <xref:System.AggregateException.InnerExceptions%2A> property of the returned <xref:System.AggregateException> object contains the original exceptions.
This method recursively flattens all instances of <xref:System.AggregateException> exceptions that are inner exceptions of the current <xref:System.AggregateException> instance. The inner exceptions returned in the new <xref:System.AggregateException> are the union of all the inner exceptions from exception tree rooted at the current <xref:System.AggregateException> instance.
## Examples
In the following example, nested <xref:System.AggregateException> instances are flattened and handled in just one loop.
:::code language="csharp" source="~/snippets/csharp/System/AggregateException/Flatten/flatten2.cs" id="Snippet22":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_Misc/tpl_exceptions/fs/flatten2.fs" id="Snippet22":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Misc/tpl_exceptions/vb/flatten2.vb" id="Snippet22":::
You can also use the <xref:System.AggregateException.Flatten%2A?displayProperty=nameWithType> method to rethrow the inner exceptions from multiple <xref:System.AggregateException> instances thrown by multiple tasks in a single <xref:System.AggregateException> instance, as the following example shows.
:::code language="csharp" source="~/snippets/csharp/System/AggregateException/Flatten/taskexceptions2.cs" id="Snippet13":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_Misc/tpl_exceptions/fs/taskexceptions2.fs" id="Snippet13":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Misc/tpl_exceptions/vb/taskexceptions2.vb" id="Snippet13":::
]]></format>
</remarks>
<related type="Article" href="/dotnet/standard/parallel-programming/exception-handling-task-parallel-library">Exception Handling (Task Parallel Library)</related>
<related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/p/?LinkId=259617">Aggregating Exceptions</related>
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<summary>Returns the <see cref="T:System.Exception"/> that is the root cause of this exception. This exception is either the root exception or the first <see cref="T:System.AggregateException"/> that contains either multiple inner exceptions or no inner exceptions at all.</summary>
<returns>The <see cref="T:System.Exception" /> that is the root cause of this exception.</returns>
<remarks>To be added.</remarks>
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<param name="info">The object that holds the serialized object data.</param>
<param name="context">The contextual information about the source or destination.</param>
<summary>Initializes a new instance of the <see cref="T:System.AggregateException" /> class with serialized data.</summary>
<remarks>
<format type="text/markdown"><.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">The <paramref name="info" /> argument is null.</exception>
<related type="Article" href="/dotnet/standard/serialization/xml-and-soap-serialization">XML and SOAP Serialization</related>
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<Member MemberName="Handle">
<MemberSignature Language="C#" Value="public void Handle (Func<Exception,bool> predicate);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance void Handle(class System.Func`2<class System.Exception, bool> predicate) cil managed" />
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<param name="predicate">The predicate to execute for each exception. The predicate accepts as an argument the <see cref="T:System.Exception" /> to be processed and returns a Boolean to indicate whether the exception was handled.</param>
<summary>Invokes a handler on each <see cref="T:System.Exception" /> contained by this <see cref="T:System.AggregateException" />.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Each invocation of the `predicate` returns true or false to indicate whether the <xref:System.Exception> was handled. After all invocations, if any exceptions went unhandled, all unhandled exceptions will be put into a new <xref:System.AggregateException> which will be thrown. Otherwise, the <xref:System.AggregateException.Handle%2A> method simply returns. If any invocations of the `predicate` throws an exception, it will halt the processing of any more exceptions and immediately propagate the thrown exception as-is.
## Examples
Ordinarily, an exception handler that catches an <xref:System.AggregateException> exception uses a `foreach` loop (in C#) or `For Each` loop (in Visual Basic) to handle each exception in its <xref:System.AggregateException.InnerExceptions%2A> collection. Instead, the following example uses the <xref:System.AggregateException.Handle%2A> method to handle each exception, and only rethrows exceptions that are not `CustomException` instances.
:::code language="csharp" source="~/snippets/csharp/System/AggregateException/Handle/handlemethod2.cs" id="Snippet16":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_Misc/tpl_exceptions/fs/handlemethod2.fs" id="Snippet16":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Misc/tpl_exceptions/vb/handlemethod2.vb" id="Snippet16":::
The following is a more complete example that uses the <xref:System.AggregateException.Handle%2A> method to provide special handling for an <xref:System.UnauthorizedAccessException> when enumerating files.
:::code language="csharp" source="~/snippets/csharp/System/AggregateException/Handle/taskexceptions.cs" id="Snippet12":::
:::code language="fsharp" source="~/snippets/fsharp/VS_Snippets_Misc/tpl_exceptions/fs/taskexceptions.fs" id="Snippet12":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Misc/tpl_exceptions/vb/taskexceptions.vb" id="Snippet12":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">The <paramref name="predicate" /> argument is null.</exception>
<exception cref="T:System.AggregateException">An exception contained by this <see cref="T:System.AggregateException" /> was not handled.</exception>
</Docs>
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<summary>Gets a read-only collection of the <see cref="T:System.Exception" /> instances that caused the current exception.</summary>
<value>A read-only collection of the <see cref="T:System.Exception" /> instances that caused the current exception.</value>
<remarks>To be added.</remarks>
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<summary>Gets a message that describes the exception.</summary>
<value>The message that describes the exception.</value>
<remarks>To be added.</remarks>
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<remarks>To be added.</remarks>
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