notes:uwp:iasync_interfaces
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notes:uwp:iasync_interfaces [2016/12/29] admin |
notes:uwp:iasync_interfaces [2019/01/06] (current) leszek |
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| The above extension methods are defined in the class //WindowsRuntimeSystemExtensions// located in the //System// namespace. They return a //TaskAwaiter// object which is awaited in the code. Once the asynchronous operation completes, the //TaskAwaiter// object ensures that the code continues executing via the //SynchronizationContext// that is associated with the original thread. Then the thread queries the Task's //Result// property, which returns the result. | The above extension methods are defined in the class //WindowsRuntimeSystemExtensions// located in the //System// namespace. They return a //TaskAwaiter// object which is awaited in the code. Once the asynchronous operation completes, the //TaskAwaiter// object ensures that the code continues executing via the //SynchronizationContext// that is associated with the original thread. Then the thread queries the Task's //Result// property, which returns the result. | ||
| + | |||
| + | The //AsTask// method converts the //Windows.Foundation.IAsyncAction// and //Windows.Foundation.IAsyncOperation<TResult>// objects into .NET //System.Threading.Tasks.Task// (or //System.Threading.Tasks.Task<TResult>//) objects. | ||
| + | To handle cancellation and progress updates, call one of the //AsTask// extension methods. | ||
| + | |||
| + | <code csharp> | ||
| + | public static class WindowsRuntimeSystemExtensions // defined in System | ||
| + | { | ||
| + | public static Task AsTask(this IAsyncAction source, CancellationToken cancellationToken); | ||
| + | public static Task AsTask<TProgress>(this IAsyncActionWithProgress<TProgress> source, CancellationToken cancellationToken, IProgress<TProgress> progress); | ||
| + | public static Task<TResult> AsTask<TResult>(this IAsyncOperation<TResult> source, CancellationToken cancellationToken); | ||
| + | public static Task<TResult> AsTask<TResult, TProgress>(this IAsyncOperationWithProgress<TResult, TProgress> source, CancellationToken cancellationToken, IProgress<TProgress> progress); | ||
| + | |||
| + | public static IAsyncAction AsAsyncAction(this Task source); | ||
| + | public static IAsyncOperation<TResult> AsAsyncOperation<TResult>(this Task<TResult> source); | ||
| + | ... | ||
| + | } | ||
| + | </code> | ||
| Example: Write a line of text to a file: | Example: Write a line of text to a file: | ||
notes/uwp/iasync_interfaces.txt ยท Last modified: 2019/01/06 by leszek
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