C# ConsumerBuilder<；忽略，字符串>；Build（）在统一中工作，但；序列不包含匹配元素“；部署到全息透镜时出错

下面的C#代码在Unity编辑器中工作得很好-它设置了卡夫卡，并按预期记录消息

using System;
using System.Linq;
using System.Threading;
using UnityEngine;
using Confluent.Kafka;

public class main : MonoBehaviour
{
    ConsumerBuilder<Ignore, string> cb;
    IConsumer<Ignore, string> c;
    ConsumerConfig conf;
    CancellationTokenSource cts;

    int milliseconds = 10;
    TimeSpan timeout;

    void Start()
    {
        print("main start");
        conf = new ConsumerConfig();
        conf.GroupId = "test-consumer-group";
        conf.BootstrapServers = "localhost:9092";
        conf.AutoOffsetReset = AutoOffsetReset.Earliest;

        cb = new ConsumerBuilder<Ignore, string>(conf);
        if (cb != null)
        {
            print("cb is ok: " + cb.ToString());
            c = cb.Build();
        }

        timeout = new TimeSpan(0, 0, 0, 0, milliseconds);
        c.Subscribe("testTopicName");
        cts = new CancellationTokenSource();

        print("main started");
    }

但是，在我看来，这种情况不适用于我的代码

我上传了Unity项目

以及部署到Hololens的VS构建项目（1.2 GB）

---

非常感谢您的任何想法或帮助

不知道我是否能帮上忙，但看到Unity3d+Kafka太好了！我猜它可能与经纪人无关？你是否有卡夫卡在全息镜头内运行（

localhost:9092

）！？我会订阅只有当消费者是正确创建的，但在您的代码中，您只是日志，如果它是空的。另一件事是，更新在每一帧都被调用，我想说的太多了，而

consumer.consume（）

需要时间来获取记录，我不认为设置零超时是明智之举@Paizo，好主意。1.我不确定Kafka是否可以在Hololens中运行，因为它只是一个Java服务器，但localhost可能需要更改为我的笔记本电脑的IP，我在那里运行Kafka。2.你的意思是如果（c！=null）c.Subscribe（“testTopicName”）应该运行吗？3.我发现10毫秒的超时“暂时有效”，以人的速度。c、 消费（cts）会无限期地阻塞，直到收到一条消息，这让我误以为Unity已经冻结了。不过，我确实需要对10ms进行性能测试。是的，当然，如果c为null，您将在subscribe上获得一个null指针。事实上，我甚至不认为卡夫卡在霍洛伦斯上跑步。我会将

consume

与unity

Update

或

FixedUpdate

分离，您不希望冻结帧以等待记录；将记录保存在列表中，然后可以在fixedupdate中处理这些记录，例如，如果要生成网格。

Exception thrown at 0x776F3072 in MRB100.exe: Microsoft C++ exception: Il2CppExceptionWrapper at memory location 0x01F0BB84.
Exception thrown at 0x776F3072 in MRB100.exe: Microsoft C++ exception: Il2CppExceptionWrapper at memory location 0x01F0E384.
Exception thrown at 0x776F3072 in MRB100.exe: Microsoft C++ exception: Il2CppExceptionWrapper at memory location 0x01F0E384.
InvalidOperationException: Sequence contains no matching element
  at System.Linq.Enumerable.Single[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] predicate) [0x00000] in <00000000000000000000000000000000>:0 
  at Confluent.Kafka.Impl.Librdkafka.SetDelegates (System.Type nativeMethodsClass) [0x00000] in <00000000000000000000000000000000>:0 
  at Confluent.Kafka.Impl.Librdkafka.Initialize (System.String userSpecifiedPath) [0x00000] in <00000000000000000000000000000000>:0 
  at Confluent.Kafka.Consumer`2[TKey,TValue]..ctor (Confluent.Kafka.ConsumerBuilder`2[TKey,TValue] builder) [0x00000] in <00000000000000000000000000000000>:0 
  at Confluent.Kafka.ConsumerBuilder`2[TKey,TValue].Build () [0x00000] in <00000000000000000000000000000000>:0 
  at main.Start () [0x00000] in <00000000000000000000000000000000>:0 

(Filename: currently not available on il2cpp Line: -1)

For example if you use
> var result = myEnumerableCollection.First(x => x.Name == person.Name);

This will throw InvalidOperationException with Sequence contains no matching element.
But if you use
> var result = myEnumerableCollection.FirstOrDefault(x => x.Name == person.Name);
> if(result == null) //did not find in the collection something went wrong or .....

Which will return you a null if its not found then you can check if the result is null and continue on with your work