本文整理汇总了C#中Func.IfNotNull方法的典型用法代码示例。如果您正苦于以下问题：C# Func.IfNotNull方法的具体用法？C# Func.IfNotNull怎么用？C# Func.IfNotNull使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Func的用法示例。
在下文中一共展示了Func.IfNotNull方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: Write
public static long Write(int howMany,
Func<int, IEvent> createEvent = null,
Func<EventStoreDbContext> createEventStore = null)
{
createEvent = createEvent ?? (i => new Order.ItemAdded
{
SequenceNumber = i,
AggregateId = Recipes.Any.Guid(),
Price = 1.99m,
ProductName = Recipes.Any.Paragraph(3),
Quantity = 1
});
Console.WriteLine("writing {0} events", howMany);
long lastEventId = 0;
using (new TransactionScope(TransactionScopeOption.Suppress, TransactionScopeAsyncFlowOption.Enabled))
using (var eventStore = createEventStore.IfNotNull()
.Then(c => c())
.Else(() => new EventStoreDbContext()))
{
Enumerable.Range(1, howMany).ForEach(i =>
{
var e = createEvent(i);
e.IfTypeIs<Event>()
.ThenDo(ev =>
{
if (ev.AggregateId == Guid.Empty)
{
ev.AggregateId = Guid.NewGuid();
}
if (ev.SequenceNumber == 0)
{
ev.SequenceNumber = i;
}
});
var storableEvent = e.ToStorableEvent();
eventStore.Events.Add(storableEvent);
eventStore.SaveChanges();
lastEventId = storableEvent.Id;
Console.WriteLine("wrote event " + lastEventId);
});
}
return lastEventId;
}示例2: Calculate
public static IEnumerable<EventHandlerProgress> Calculate(
Func<DbContext> createDbContext,
Func<EventStoreDbContext> createEventStoreDbContext = null)
{
if (createDbContext == null)
{
throw new ArgumentNullException("createDbContext");
}
int count;
using (new TransactionScope(TransactionScopeOption.Suppress, TransactionScopeAsyncFlowOption.Enabled))
using (var db = createEventStoreDbContext.IfNotNull()
.Then(create => create())
.Else(() => new EventStoreDbContext()))
{
count = db.Events.Count();
}
if (count == 0)
{
return Enumerable.Empty<EventHandlerProgress>();
}
var now = Clock.Now();
var progress = new List<EventHandlerProgress>();
using (new TransactionScope(TransactionScopeOption.Suppress, TransactionScopeAsyncFlowOption.Enabled))
using (var db = createDbContext())
{
var readModelInfos = db.Set<ReadModelInfo>().ToArray();
readModelInfos
.ForEach(i =>
{
var eventsProcessed = i.InitialCatchupEndTime.HasValue
? i.BatchTotalEvents - i.BatchRemainingEvents
: i.InitialCatchupEvents - i.BatchRemainingEvents;
long? timeTakenForProcessedEvents = null;
if (i.BatchStartTime.HasValue && i.InitialCatchupStartTime.HasValue)
{
timeTakenForProcessedEvents = i.InitialCatchupEndTime.HasValue
? (now - i.BatchStartTime).Value.Ticks
: (now - i.InitialCatchupStartTime).Value.Ticks;
}
if (eventsProcessed == 0)
{
return;
}
var eventHandlerProgress = new EventHandlerProgress
{
Name = i.Name,
InitialCatchupEvents = i.InitialCatchupEvents,
TimeTakenForInitialCatchup = i.InitialCatchupStartTime.HasValue
? (i.InitialCatchupEndTime.HasValue ? i.InitialCatchupEndTime : now) - i.InitialCatchupStartTime
: null,
TimeRemainingForCatchup = eventsProcessed != 0 && timeTakenForProcessedEvents.HasValue
? (TimeSpan?) TimeSpan.FromTicks((long) (timeTakenForProcessedEvents*(i.BatchRemainingEvents/(decimal) eventsProcessed)))
: null,
EventsRemaining = i.BatchRemainingEvents,
PercentageCompleted = (1 - ((decimal) i.BatchRemainingEvents/count))*100,
LatencyInMilliseconds = i.LatencyInMilliseconds,
LastUpdated = i.LastUpdated,
CurrentAsOfEventId = i.CurrentAsOfEventId,
FailedOnEventId = i.FailedOnEventId,
Error = i.Error
};
progress.Add(eventHandlerProgress);
});
}
return progress;
}