官方 Neo4J 驱动程序的 Hello World 示例在调用 Session 时出现参考问题

Question

Ok,

I'm in C# using .NET Framework 4.7.2. I'm trying to use the Hello World example https://neo4j.com/developer/dotnet/ . I've installed the driver w/ "PM Install-Package Neo4j.Driver-4.0" and have a reference in the project for version 4.0.78.1.

For the line

using (var session = _driver.Session())

I'm getting

'IDriver' does not contain a definition for 'Session' and no accessible extension method 'Session' accepting a first argument of type 'IDriver' could be found (are you missing a using directive or an assembly reference?)

using Neo4j.Driver;
using System;
using System.Linq;
namespace ConsoleApp5 {
    public class HelloWorldExample : IDisposable
    {
        private readonly IDriver _driver;

        public HelloWorldExample(string uri, string user, string password)
        {
            _driver = GraphDatabase.Driver(uri, AuthTokens.Basic(user, password));
        }

        public void PrintGreeting(string message)
        {
            using (var session = _driver.Session())
            {
                var greeting = session.WriteTransaction(tx =>
                {
                    var result = tx.Run("CREATE (a:Greeting) " +
                                        "SET a.message = $message " +
                                        "RETURN a.message + ', from node ' + id(a)",
                        new { message });
                    return result.Single()[0].As<string>();
                });
                Console.WriteLine(greeting);
            }
        }

        public void Dispose()
        {
            _driver?.Dispose();
        }

        public static void Main()
        {
            using (var greeter = new HelloWorldExample("bolt://localhost:7687", "neo4j", "password"))
            {
                greeter.PrintGreeting("hello, world");
            }
        }
    }    
    }

Clearly I'm missing something simple - but after two hours of searching I'm out of ideas.

Answer 1

For Driver version 4, you need to add Neo4j.Driver.Simple Nuget package to the project as well. Either via graphic interface, or via command line as PM> Install-Package Neo4j.Driver.Simple

According to Neo4j Driver 4.0 docs, Session() is an extension on IDriver interface. And as per Session() doc, it's from:

Assembly: Neo4j.Driver.Simple (in Neo4j.Driver.Simple.dll) Version: 4.0.2