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Task<TResult> Class

Represents an asynchronous operation that can return a value.

System.Object
  System.Threading.Tasks.Task
    System.Threading.Tasks.Task<TResult>

Namespace:  System.Threading.Tasks
Assembly:  mscorlib (in mscorlib.dll)

[DebuggerDisplayAttribute("Id = {Id}, Status = {Status}, Method = {DebuggerDisplayMethodDescription}, Result = {DebuggerDisplayResultDescription}")]
public class Task<TResult> : Task

Type Parameters

TResult

The type of the result produced by this Task<TResult>.

The Task<TResult> type exposes the following members.

  NameDescription
Public methodTask<TResult>(Func<TResult>)Initializes a new Task<TResult> with the specified function.
Public methodTask<TResult>(Func<TResult>, CancellationToken)Initializes a new Task<TResult> with the specified function.
Public methodTask<TResult>(Func<TResult>, TaskCreationOptions)Initializes a new Task<TResult> with the specified function and creation options.
Public methodTask<TResult>(Func<Object, TResult>, Object)Initializes a new Task<TResult> with the specified function and state.
Public methodTask<TResult>(Func<TResult>, CancellationToken, TaskCreationOptions)Initializes a new Task<TResult> with the specified function and creation options.
Public methodTask<TResult>(Func<Object, TResult>, Object, CancellationToken)Initializes a new Task<TResult> with the specified action, state, and options.
Public methodTask<TResult>(Func<Object, TResult>, Object, TaskCreationOptions)Initializes a new Task<TResult> with the specified action, state, and options.
Public methodTask<TResult>(Func<Object, TResult>, Object, CancellationToken, TaskCreationOptions)Initializes a new Task<TResult> with the specified action, state, and options.
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  NameDescription
Public propertyAsyncStateGets the state object supplied when the Task was created, or null if none was supplied. (Inherited from Task.)
Public propertyCreationOptionsGets the TaskCreationOptions used to create this task. (Inherited from Task.)
Public propertyExceptionGets the AggregateException that caused the Task to end prematurely. If the Task completed successfully or has not yet thrown any exceptions, this will return null. (Inherited from Task.)
Public propertyStatic memberFactoryProvides access to factory methods for creating Task<TResult> instances.
Public propertyIdGets a unique ID for this Task instance. (Inherited from Task.)
Public propertyIsCanceledGets whether this Task instance has completed execution due to being canceled. (Inherited from Task.)
Public propertyIsCompletedGets whether this Task has completed. (Inherited from Task.)
Public propertyIsFaultedGets whether the Task completed due to an unhandled exception. (Inherited from Task.)
Public propertyResultGets the result value of this Task<TResult>.
Public propertyStatusGets the TaskStatus of this Task. (Inherited from Task.)
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  NameDescription
Public methodContinueWith(Action<Task>)Creates a continuation that executes asynchronously when the target Task completes. (Inherited from Task.)
Public methodContinueWith(Action<Task<TResult>>)Creates a continuation that executes asynchronously when the target Task<TResult> completes.
Public methodContinueWith(Action<Task>, CancellationToken)Creates a continuation that executes asynchronously when the target Task completes. (Inherited from Task.)
Public methodContinueWith(Action<Task>, TaskContinuationOptions)Creates a continuation that executes according to the specified TaskContinuationOptions. (Inherited from Task.)
Public methodContinueWith(Action<Task>, TaskScheduler)Creates a continuation that executes asynchronously when the target Task completes. (Inherited from Task.)
Public methodContinueWith(Action<Task<TResult>>, CancellationToken)Creates a continuation that executes asynchronously when the target Task<TResult> completes.
Public methodContinueWith(Action<Task<TResult>>, TaskContinuationOptions)Creates a continuation that executes according the condition specified in continuationOptions.
Public methodContinueWith(Action<Task<TResult>>, TaskScheduler)Creates a continuation that executes asynchronously when the target Task<TResult> completes.
Public methodContinueWith(Action<Task>, CancellationToken, TaskContinuationOptions, TaskScheduler)Creates a continuation that executes according to the specified TaskContinuationOptions. (Inherited from Task.)
Public methodContinueWith(Action<Task<TResult>>, CancellationToken, TaskContinuationOptions, TaskScheduler)Creates a continuation that executes according the condition specified in continuationOptions.
Public methodContinueWith<TResult>(Func<Task, TResult>)Creates a continuation that executes asynchronously when the target Task completes. (Inherited from Task.)
Public methodContinueWith<TNewResult>(Func<Task<TResult>, TNewResult>)Creates a continuation that executes asynchronously when the target Task<TResult> completes.
Public methodContinueWith<TResult>(Func<Task, TResult>, CancellationToken)Creates a continuation that executes asynchronously when the target Task completes. (Inherited from Task.)
Public methodContinueWith<TResult>(Func<Task, TResult>, TaskContinuationOptions)Creates a continuation that executes according to the condition specified in continuationOptions. (Inherited from Task.)
Public methodContinueWith<TResult>(Func<Task, TResult>, TaskScheduler)Creates a continuation that executes asynchronously when the target Task completes. (Inherited from Task.)
Public methodContinueWith<TNewResult>(Func<Task<TResult>, TNewResult>, CancellationToken)Creates a continuation that executes asynchronously when the target Task<TResult> completes.
Public methodContinueWith<TNewResult>(Func<Task<TResult>, TNewResult>, TaskContinuationOptions)Creates a continuation that executes according the condition specified in continuationOptions.
Public methodContinueWith<TNewResult>(Func<Task<TResult>, TNewResult>, TaskScheduler)Creates a continuation that executes asynchronously when the target Task<TResult> completes.
Public methodContinueWith<TResult>(Func<Task, TResult>, CancellationToken, TaskContinuationOptions, TaskScheduler)Creates a continuation that executes according to the condition specified in continuationOptions. (Inherited from Task.)
Public methodContinueWith<TNewResult>(Func<Task<TResult>, TNewResult>, CancellationToken, TaskContinuationOptions, TaskScheduler)Creates a continuation that executes according the condition specified in continuationOptions.
Public methodDispose()Releases all resources used by the current instance of the Task class. (Inherited from Task.)
Protected methodDispose(Boolean)Disposes the Task, releasing all of its unmanaged resources. (Inherited from Task.)
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodRunSynchronously()Runs the Task synchronously on the current TaskScheduler. (Inherited from Task.)
Public methodRunSynchronously(TaskScheduler)Runs the Task synchronously on the TaskScheduler provided. (Inherited from Task.)
Public methodStart()Starts the Task, scheduling it for execution to the current TaskScheduler. (Inherited from Task.)
Public methodStart(TaskScheduler)Starts the Task, scheduling it for execution to the specified TaskScheduler. (Inherited from Task.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodWait()Waits for the Task to complete execution. (Inherited from Task.)
Public methodWait(CancellationToken)Waits for the Task to complete execution. (Inherited from Task.)
Public methodWait(Int32)Waits for the Task to complete execution. (Inherited from Task.)
Public methodWait(TimeSpan)Waits for the Task to complete execution. (Inherited from Task.)
Public methodWait(Int32, CancellationToken)Waits for the Task to complete execution. (Inherited from Task.)
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  NameDescription
Explicit interface implemetationPrivate propertyIAsyncResult.AsyncWaitHandleGets a WaitHandle that can be used to wait for the task to complete. (Inherited from Task.)
Explicit interface implemetationPrivate propertyIAsyncResult.CompletedSynchronouslyGets an indication of whether the operation completed synchronously. (Inherited from Task.)
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Task<TResult> instances may be created in a variety of ways. The most common approach is by using the task's Factory property to retrieve a TaskFactory<TResult> instance that can be used to create tasks for several purposes. For example, to create a Task<TResult> that runs a function, the factory's StartNew method may be used:

// C# 
var t = Task<int>.Factory.StartNew(() => GenerateResult());

' Visual Basic
Dim t = Task(Of Integer).Factory.StartNew(Function() GenerateResult()) 

For more complete examples, see Task Parallelism (Task Parallel Library).

The Task<TResult> class also provides constructors that initialize the task but that do not schedule it for execution. For performance reasons, the StartNew method should be the preferred mechanism for creating and scheduling computational tasks, but for scenarios where creation and scheduling must be separated, the constructors may be used, and the task's Start method may then be used to schedule the task for execution at a later time.

Silverlight

Supported in: 5

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

All members of Task<TResult>, except for Dispose, are thread-safe and may be used from multiple threads concurrently.

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