C# 一个任务失败，而所有任务也失败，并且没有进行任何修改。通过在循环内等待，一些配置将得到更新，而另一些配置则不会更新。这将一次执行一个报告。如果报表引擎一次只能处理一个报表，即使是异步的，那么这可能是正确的选项。OP确实说了我想用WhenAll（而不是一个接

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一个任务失败，而所有任务也失败，并且没有进行任何修改。通过在循环内等待，一些配置将得到更新，而另一些配置则不会更新。这将一次执行一个报告。如果报表引擎一次只能处理一个报表，即使是异步的，那么这可能是正确的选项。OP确实说了

我想用WhenAll（而不是一个接一个）

@PanagiotisKanavos运行所有任务-使用并行执行报告的方法进行了更新每当我在

选择

中看到导致副作用的代码时，我都会感到奇怪。我不介意该函数是否被称为

Iter

函数，如F#s

Seq.Iter

@PanagiotisKanavos-同意副作用。OP提供的

配置的代码更新状态

-因此将符合其要求：）另一个考虑因素是错误将使配置取决于修改失败的配置。一旦你考虑了错误处理，事情就变得有趣多了。第一次出错时停止是否正常？跳过和记录失败？回滚所有内容？

var lastReportAllTasks = new List<Task<Dictionary<string, string>>>();
var configurationTaskRelation = new Dictionary<int, Task<Dictionary<string, string>>>();
foreach (var configuration in MachineConfigurations)
{
    var task = machineService.GetReports(configuration);
    lastReportAllTasks.Add(task);
    configurationTaskRelation.Add(configuration.Id, task);
}

await Task.WhenAll(lastReportAllTasks);
foreach (var configuration in MachineConfigurations)
{
    var lastReportTask = configurationTaskRelation[configuration.Id];
    configuration.LastReport = await lastReportTask;
}

using System.Linq;

var taskResultsWithConfiguration = MachineConfigurations.Select(conf => 
    new { Conf = conf, Task = machineService.GetReports(conf) }).ToList();
await Task.WhenAll(taskResultsWithConfiguration.Select(pair => pair.Task));

foreach (var pair in taskResultsWithConfiguration)
      pair.Conf.LastReport = pair.Task.Result;

var tasks=MachineConfigurations.Select(async conf=>{
                       var report= await machineService.GetReports(conf);
                       return new {conf,report});
var results=await Task.WhenAll(tasks);
foreach(var pair in results)
{
    pair.conf.LastReport=pair.report;
}

foreach(var task in tasks)
{   
    var pair=await task;
    pair.conf.LastReport=pair.report;
}

foreach(var task in tasks)
{   
    try
    {
        var pair=await task;
        pair.conf.LastReport=pair.report;
    }
    catch(Exception exc)
    {
        //Make sure the error is logged
        Log.Error(exc);
        ErrorQueue.Enqueue(new ProcessingError(conf,ex);
    }
}
//Handle errors after the loop

var reportingBlock=new TransformBlock<Ticket,IFlowEnvelope<TicketReport>(reportFunc,dopOptions);
var happyBlock = new ActionBlock<IFlowEnvelope<TicketReport>>(storeToDb);
var errorBlock = new ActionBlock<IFlowEnvelope<TicketReport>>(logError);

reportingBlock.LinkTo(happyBlock,linkOptions,msg=>msg.Success);
reportingBlock.LinkTo(errorBlock,linkOptions,msg=>!msg.Success);

foreach(var ticket in tickets)
{
    reportingBlock.Post(ticket);
}

async Task<IFlowEnvelope<Ticket,TicketReport>> reportFunc(Ticket ticket)
{
    try
    {
        //Do the heavy processing
        return new Success<TicketReport>(report);
    }
    catch(Exception exc)
    {
        //Construct an error message, msg
        return new Failure<TicketReport>(report,msg);
    }
}

foreach (var configuration in MachineConfigurations)
{
    configuration.LastReport = await machineService.GetReports(configuration);
}

Func<Configuration, Task> loadReport = 
    async config => config.LastReport = await machineService.GetReports(config);

await Task.WhenAll(MachineConfigurations.Select(loadReport));

Func<Configuration, Task<Configuration>> getConfigWithReportAsync = 
    async config => 
    {            
        var report = await machineService.GetReports(config);
        return new Configuration
        {
            Id = config.Id,
            LastReport = report
        };
    }

var configsWithUpdatedReports = 
    await Task.WhenAll(MachineConfigurations.Select(getConfigWithReportAsync));