/// <summary>
/// Create a complated <see cref="IAsyncOperationWithProgress{TResult, TProgress}"/>.
/// </summary>
/// <param name="results">Results of the operation.</param>
/// <returns>A complated <see cref="IAsyncOperationWithProgress{TResult, TProgress}"/>.</returns>
public static IAsyncOperationWithProgress <T, TProgress> CreateCompleted(T results)
=> AsyncOperationCache <TProgress> .TryGetCacehd(results) ?? CompletedAsyncInfo <T, TProgress> .Create(results);
/// <summary>
/// Create a complated <see cref="IAsyncOperation{TResult}"/>.
/// </summary>
/// <param name="results">Results of the operation.</param>
/// <returns>A complated <see cref="IAsyncOperation{TResult}"/>.</returns>
public static IAsyncOperation <T> CreateCompleted(T results)
=> AsyncOperationCache <VoidProgress> .TryGetCacehd(results) ?? CompletedAsyncInfo <T, VoidProgress> .Create(results);