找不到方法'Sockets.Plugin.Abstractions.ITcpSocketClient.ConnectAsync'（Neo4j驱动程序）

Question

我正在尝试使用 Neo4j .Net驱动程序与 Xamarin 应用程序中的本地Neo4j数据库进行通信。

这是我的代码：

using Neo4j.Driver.V1; // I have this at the top of the class

//and this in the constructor just to test it
using (var driver = GraphDatabase.Driver("bolt://localhost", AuthTokens.Basic("neo4j", "root")))
using (var session = driver.Session())
{
    session.Run("CREATE (a:User {name:'Arthur'})");
}

它们在网站（https://neo4j.com/developer/language-guides/）上作为示例提供的代码基本相同。

当我尝试运行项目时，我收到以下错误：

System.AggregateException: One or more errors occurred. ---> System.MissingMethodException: Method 'Sockets.Plugin.Abstractions.ITcpSocketClient.ConnectAsync' not found.
  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[TStateMachine] (TStateMachine& stateMachine) [0x00031] in /Users/builder/data/lanes/3426/6c3fee4d/source/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:316
  at Neo4j.Driver.Internal.Connector.SocketClient.Start () [0x00023] in <d05dc2e6bd2a40acab42430b347d4724>:0
  at Neo4j.Driver.Internal.Connector.SocketConnection.<.ctor>b__3_0 () [0x00000] in <d05dc2e6bd2a40acab42430b347d4724>:0
  at System.Threading.Tasks.Task`1[TResult].InnerInvoke () [0x00012] in /Users/builder/data/lanes/3426/6c3fee4d/source/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Future.cs:680
  at System.Threading.Tasks.Task.Execute () [0x00016] in /Users/builder/data/lanes/3426/6c3fee4d/source/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Task.cs:2502
  --- End of inner exception stack trace ---
  at System.Threading.Tasks.Task.ThrowIfExceptional (System.Boolean includeTaskCanceledExceptions) [0x00014] in /Users/builder/data/lanes/3426/6c3fee4d/source/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Task.cs:2157
  at System.Threading.Tasks.Task.Wait (System.Int32 millisecondsTimeout, System.Threading.CancellationToken cancellationToken) [0x00052] in /Users/builder/data/lanes/3426/6c3fee4d/source/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Task.cs:3189
  at System.Threading.Tasks.Task.Wait () [0x00000] in /Users/builder/data/lanes/3426/6c3fee4d/source/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Task.cs:3054
  at Neo4j.Driver.Internal.Connector.SocketConnection..ctor (Neo4j.Driver.Internal.Connector.ISocketClient socketClient, Neo4j.Driver.V1.IAuthToken authToken, Neo4j.Driver.V1.ILogger logger, Neo4j.Driver.Internal.Messaging.IMessageResponseHandler messageResponseHandler) [0x00046] in <d05dc2e6bd2a40acab42430b347d4724>:0
  at Neo4j.Driver.Internal.Connector.SocketConnection..ctor (System.Uri url, Neo4j.Driver.V1.IAuthToken authToken, Neo4j.Driver.V1.Config config) [0x00016] in <d05dc2e6bd2a40acab42430b347d4724>:0
  at Neo4j.Driver.Internal.Session..ctor (System.Uri uri, Neo4j.Driver.V1.IAuthToken authToken, Neo4j.Driver.V1.Config config, Neo4j.Driver.Internal.Connector.IConnection conn, System.Action`1[T] releaseAction) [0x0005c] in <d05dc2e6bd2a40acab42430b347d4724>:0
  at Neo4j.Driver.Internal.SessionPool.<GetSession>b__14_0 () [0x0003b] in <d05dc2e6bd2a40acab42430b347d4724>:0
  at Neo4j.Driver.Internal.LoggerBase.TryExecute[T] (System.Func`1[TResult] func) [0x00000] in <d05dc2e6bd2a40acab42430b347d4724>:0

我尝试查看Neo4j手册（http://neo4j.com/docs/operations-manual/current/）并在线搜索，但找不到解决方案。

Answer 1

如果你看看最新的Neo4J驱动程序： https://www.nuget.org/packages/Neo4j.Driver/1.0.2

您会看到它依赖于rda.SocketsForPCL（＆gt; = 1.2.2）

Neo4J尝试调用的方法在最新的rda.SocketsForPCL中被修改： https://www.nuget.org/packages/rda.SocketsForPCL/2.0.2

开发者的评论是：

  

TcpSocketClient＆＃39; ConnectAsync方法可选择使用   CancellationToken支持客户端调用的取消和   超时等场景。谢谢@SparkStream

您的错误是：

  

方法＆＃39; Sockets.Plugin.Abstractions.ITcpSocketClient.ConnectAsync＆＃39;不   找到。

解决方案是：

选择早期版本的rda.SocketsForPCL（例如1.2.2，这绝对有效），你的问题就会消失。

例如，如果您正在使用NuGet的paket依赖项管理器，则可以将以下内容添加到 paket.dependencies 文件中：

nuget rda.SocketsForPCL ~> 1

祝你好运！