/// <summary>
/// Create a new instance of the <see cref="T:Microsoft.Practices.EnterpriseLibrary.TransientFaultHandling.RetryPolicy" /> class with the specified retry strategy.
/// </summary>
/// <param name="retryStrategy">The retry strategy.</param>
/// <param name="isTransient">The predicate function to detect whether the specified exception is transient.</param>
/// <typeparam name="TException">The type of the transient exception.</typeparam>
/// <returns>A new instance of the <see cref="T:Microsoft.Practices.EnterpriseLibrary.TransientFaultHandling.RetryPolicy" /> class.</returns>
public static RetryPolicy Catch <TException>(
this RetryStrategy retryStrategy,
Func <TException, bool>?isTransient = null) where TException : Exception =>
CreateRetryPolicy(
retryStrategy.NotNull(),
isTransient is null
? exception => exception is TException
: exception => exception is TException specifiedException && isTransient(specifiedException));
public static async Task <int> SaveChangesAsync(
this DbContext context, Func <IEnumerable <DbEntityEntry>, Task> resolveConflictsAsync, RetryStrategy retryStrategy)
{
context.NotNull(nameof(context));
resolveConflictsAsync.NotNull(nameof(resolveConflictsAsync));
retryStrategy.NotNull(nameof(retryStrategy));
RetryPolicy retryPolicy = new RetryPolicy(
new TransientDetection <DbUpdateConcurrencyException>(), retryStrategy);
retryPolicy.Retrying += (sender, e) =>
resolveConflictsAsync(((DbUpdateConcurrencyException)e.LastException).Entries).Wait();
return(await retryPolicy.ExecuteAsync(async() => await context.SaveChangesAsync()));
}
/// <summary> /// Create a new instance of the <see cref="T:Microsoft.Practices.EnterpriseLibrary.TransientFaultHandling.RetryPolicy" /> class with the specified retry strategy. /// </summary> /// <param name="retryStrategy">The retry strategy.</param> /// <param name="isTransient">The predicate function to detect whether the specified exception is transient.</param> /// <returns>A new instance of the <see cref="T:Microsoft.Practices.EnterpriseLibrary.TransientFaultHandling.RetryPolicy" /> class.</returns> public static RetryPolicy Catch(this RetryStrategy retryStrategy, Func <Exception, bool>?isTransient = null) => CreateRetryPolicy(retryStrategy.NotNull(), isTransient);