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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.threading.tasks.task.whenany below:

Task.WhenAny Method (System.Threading.Tasks) | Microsoft Learn

Task.WhenAny Method Definition

Creates a task that will complete when any of the supplied tasks have completed.

Overloads WhenAny(Task, Task)
Source:
Task.cs
Source:
Task.cs
Source:
Task.cs
Source:
Task.cs

Creates a task that will complete when either of the supplied tasks have completed.

public:
 static System::Threading::Tasks::Task<System::Threading::Tasks::Task ^> ^ WhenAny(System::Threading::Tasks::Task ^ task1, System::Threading::Tasks::Task ^ task2);
public static System.Threading.Tasks.Task<System.Threading.Tasks.Task> WhenAny(System.Threading.Tasks.Task task1, System.Threading.Tasks.Task task2);
static member WhenAny : System.Threading.Tasks.Task * System.Threading.Tasks.Task -> System.Threading.Tasks.Task<System.Threading.Tasks.Task>
Public Shared Function WhenAny (task1 As Task, task2 As Task) As Task(Of Task)
Parameters
task1
Task

The first task to wait on for completion.

task2
Task

The second task to wait on for completion.

Returns

A new task that represents the completion of one of the supplied tasks. Its Result is the task that completed first.

Exceptions Remarks

The returned task completes when any of the supplied tasks has completed. The returned task always ends in the RanToCompletion state with its Result set to the first task to complete. This is true even if the first task to complete ended in the Canceled or Faulted state.

WhenAny(Task[])
Source:
Task.cs
Source:
Task.cs
Source:
Task.cs
Source:
Task.cs

Creates a task that will complete when any of the supplied tasks have completed.

public:
 static System::Threading::Tasks::Task<System::Threading::Tasks::Task ^> ^ WhenAny(... cli::array <System::Threading::Tasks::Task ^> ^ tasks);
public static System.Threading.Tasks.Task<System.Threading.Tasks.Task> WhenAny(params System.Threading.Tasks.Task[] tasks);
static member WhenAny : System.Threading.Tasks.Task[] -> System.Threading.Tasks.Task<System.Threading.Tasks.Task>
Public Shared Function WhenAny (ParamArray tasks As Task()) As Task(Of Task)
Parameters
tasks
Task[]

The tasks to wait on for completion.

Returns

A task that represents the completion of one of the supplied tasks. The return task's Result is the task that completed.

Exceptions

The tasks argument was null.

The tasks array contained a null task, or was empty.

Remarks

The returned task will complete when any of the supplied tasks has completed. The returned task will always end in the RanToCompletion state with its Result set to the first task to complete. This is true even if the first task to complete ended in the Canceled or Faulted state.

WhenAny(ReadOnlySpan<Task>)
Source:
Task.cs

Creates a task that will complete when any of the supplied tasks have completed.

public:
 static System::Threading::Tasks::Task<System::Threading::Tasks::Task ^> ^ WhenAny(ReadOnlySpan<System::Threading::Tasks::Task ^> tasks);
public static System.Threading.Tasks.Task<System.Threading.Tasks.Task> WhenAny(scoped ReadOnlySpan<System.Threading.Tasks.Task> tasks);
static member WhenAny : ReadOnlySpan<System.Threading.Tasks.Task> -> System.Threading.Tasks.Task<System.Threading.Tasks.Task>
Public Shared Function WhenAny (tasks As ReadOnlySpan(Of Task)) As Task(Of Task)
Parameters Returns

A task that represents the completion of one of the supplied tasks. The return Task's Result is the task that completed.

Exceptions

The tasks array contains a null task, or is empty.

Remarks

The returned task will complete when any of the supplied tasks has completed. The returned task will always end in the RanToCompletion state with its Result set to the first task to complete. This is true even if the first task to complete ended in the Canceled or Faulted state.

WhenAny(IEnumerable<Task>)
Source:
Task.cs
Source:
Task.cs
Source:
Task.cs
Source:
Task.cs

Creates a task that will complete when any of the supplied tasks have completed.

public:
 static System::Threading::Tasks::Task<System::Threading::Tasks::Task ^> ^ WhenAny(System::Collections::Generic::IEnumerable<System::Threading::Tasks::Task ^> ^ tasks);
public static System.Threading.Tasks.Task<System.Threading.Tasks.Task> WhenAny(System.Collections.Generic.IEnumerable<System.Threading.Tasks.Task> tasks);
static member WhenAny : seq<System.Threading.Tasks.Task> -> System.Threading.Tasks.Task<System.Threading.Tasks.Task>
Public Shared Function WhenAny (tasks As IEnumerable(Of Task)) As Task(Of Task)
Parameters Returns

A task that represents the completion of one of the supplied tasks. The return task's Result is the task that completed.

Exceptions

The tasks argument was null.

The tasks array contained a null task, or was empty.

Remarks

The returned task will complete when any of the supplied tasks has completed. The returned task will always end in the RanToCompletion state with its Result set to the first task to complete. This is true even if the first task to complete ended in the Canceled or Faulted state.

WhenAny<TResult>(IEnumerable<Task<TResult>>)
Source:
Task.cs
Source:
Task.cs
Source:
Task.cs
Source:
Task.cs

Creates a task that will complete when any of the supplied tasks have completed.

public:
generic <typename TResult>
 static System::Threading::Tasks::Task<System::Threading::Tasks::Task<TResult> ^> ^ WhenAny(System::Collections::Generic::IEnumerable<System::Threading::Tasks::Task<TResult> ^> ^ tasks);
public static System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> WhenAny<TResult>(System.Collections.Generic.IEnumerable<System.Threading.Tasks.Task<TResult>> tasks);
static member WhenAny : seq<System.Threading.Tasks.Task<'Result>> -> System.Threading.Tasks.Task<System.Threading.Tasks.Task<'Result>>
Public Shared Function WhenAny(Of TResult) (tasks As IEnumerable(Of Task(Of TResult))) As Task(Of Task(Of TResult))
Type Parameters
TResult

The type of the completed task.

Parameters Returns

A task that represents the completion of one of the supplied tasks. The return task's Result is the task that completed.

Exceptions

The tasks argument was null.

The tasks array contained a null task, or was empty.

Remarks

The returned task will complete when any of the supplied tasks has completed. The returned task will always end in the RanToCompletion state with its Result set to the first task to complete. This is true even if the first task to complete ended in the Canceled or Faulted state.

WhenAny<TResult>(ReadOnlySpan<Task<TResult>>)
Source:
Task.cs

Creates a task that will complete when any of the supplied tasks have completed.

public:
generic <typename TResult>
 static System::Threading::Tasks::Task<System::Threading::Tasks::Task<TResult> ^> ^ WhenAny(ReadOnlySpan<System::Threading::Tasks::Task<TResult> ^> tasks);
public static System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> WhenAny<TResult>(scoped ReadOnlySpan<System.Threading.Tasks.Task<TResult>> tasks);
static member WhenAny : ReadOnlySpan<System.Threading.Tasks.Task<'Result>> -> System.Threading.Tasks.Task<System.Threading.Tasks.Task<'Result>>
Public Shared Function WhenAny(Of TResult) (tasks As ReadOnlySpan(Of Task(Of TResult))) As Task(Of Task(Of TResult))
Type Parameters
TResult

The type of the result returned by the tasks.

Parameters Returns

A task that represents the completion of one of the supplied tasks. The return Task's Result is the task that completed.

Exceptions

The tasks array contains a null task, or is empty.

Remarks

The returned task will complete when any of the supplied tasks has completed. The returned task will always end in the RanToCompletion state with its Result set to the first task to complete. This is true even if the first task to complete ended in the Canceled or Faulted state.

WhenAny<TResult>(Task<TResult>[])
Source:
Task.cs
Source:
Task.cs
Source:
Task.cs
Source:
Task.cs

Creates a task that will complete when any of the supplied tasks have completed.

public:
generic <typename TResult>
 static System::Threading::Tasks::Task<System::Threading::Tasks::Task<TResult> ^> ^ WhenAny(... cli::array <System::Threading::Tasks::Task<TResult> ^> ^ tasks);
public static System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> WhenAny<TResult>(params System.Threading.Tasks.Task<TResult>[] tasks);
static member WhenAny : System.Threading.Tasks.Task<'Result>[] -> System.Threading.Tasks.Task<System.Threading.Tasks.Task<'Result>>
Public Shared Function WhenAny(Of TResult) (ParamArray tasks As Task(Of TResult)()) As Task(Of Task(Of TResult))
Type Parameters
TResult

The type of the completed task.

Parameters
tasks
Task<TResult>[]

The tasks to wait on for completion.

Returns

A task that represents the completion of one of the supplied tasks. The return task's Result is the task that completed.

Exceptions

The tasks argument was null.

The tasks array contained a null task, or was empty.

Remarks

The returned task will complete when any of the supplied tasks has completed. The returned task will always end in the RanToCompletion state with its Result set to the first task to complete. This is true even if the first task to complete ended in the Canceled or Faulted state.

WhenAny<TResult>(Task<TResult>, Task<TResult>)
Source:
Task.cs
Source:
Task.cs
Source:
Task.cs
Source:
Task.cs

Creates a task that will complete when either of the supplied tasks have completed.

public:
generic <typename TResult>
 static System::Threading::Tasks::Task<System::Threading::Tasks::Task<TResult> ^> ^ WhenAny(System::Threading::Tasks::Task<TResult> ^ task1, System::Threading::Tasks::Task<TResult> ^ task2);
public static System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> WhenAny<TResult>(System.Threading.Tasks.Task<TResult> task1, System.Threading.Tasks.Task<TResult> task2);
static member WhenAny : System.Threading.Tasks.Task<'Result> * System.Threading.Tasks.Task<'Result> -> System.Threading.Tasks.Task<System.Threading.Tasks.Task<'Result>>
Public Shared Function WhenAny(Of TResult) (task1 As Task(Of TResult), task2 As Task(Of TResult)) As Task(Of Task(Of TResult))
Type Parameters
TResult

The type of the result of the returned task.

Parameters Returns

A task that represents the completion of one of the supplied tasks. The returned task's TResult is the task that completed first.

Exceptions Remarks

The returned task completes when any of the supplied tasks has completed. The returned task always ends in the RanToCompletion state with its Result set to the first task to complete. This is true even if the first task to complete ended in the Canceled or Faulted state.

Tip

In every overload of Task.WhenAny(), when the method returns the first completed task, the other tasks will continue running until completion, even if any of them completed in the Canceled or Faulted state. If that behavior is undesirable, you can cancel all the remaining tasks once the first task completes.

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