使用 .NET Core 2.2 网络连接到 Neo4j Aura api

Question

我正在尝试从 .NET core 2.2 web api 连接到 Neo4j Aura 实例。我知道我需要 Neo4j .Net Driver v4.0.0-alpha01，但我似乎无法连接。没有很多例子，因为这个驱动程序是新的，Aura 也是。

我不断收到： Failed after retried for 6 times in 30000 ms. Make sure that your database is online and retry again.

我这样配置驱动程序

public void ConfigureServices(IServiceCollection services)
{
   string uri = "neo4j://1234567.databases.neo4j.io:7687";//not actual subdomain
   string username = "neo4j";
   string password = "seeeeeeecret";//not actual password

   services.AddCors();
   services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
   services.AddSingleton(GraphDatabase.Driver(uri, AuthTokens.Basic(username, password)));
}

在我的测试控制器中运行这个

private async Task<string> Neo4JTestAsync()
        {
            string db = "MyDb";
            string message = "TESTMESSAGE";

            IAsyncSession session = _driver.AsyncSession(o => o.WithDatabase(db));
            try
            {
                var greeting = session.WriteTransactionAsync(async tx =>
                {
                    var result = tx.RunAsync("CREATE (a:Greeting) " +
                                        "SET a.message = $message " +
                                        "RETURN a.message + ', from node ' + id(a)",
                        new { message });
                    var res = await result;
                    return "return something eventually";
                });
                return await greeting;
            }
            catch (Exception e)
            {
                return e.Message; // throws "Failed after retried for 6 times in 30000 ms. Make sure that your database is online and retry again"
            }
            finally
            {
                await session.CloseAsync();
            }
        }

Answer 1

您尝试过在连接字符串中使用 bolt:// 吗？

string uri = "bolt://1234567.databases.neo4j.io:7687";//not actual subdomain

Answer 2

我无法得到你的 exact 错误信息 - 但我很确定这是由于加密 - 1.x 和 4.x 驱动程序是加密的默认位置 - 现在默认关闭。

因此您需要将初始化更改为：

 services.AddSingleton(GraphDatabase.Driver(uri, AuthTokens.Basic(username, password), config => config.WithEncryptionLevel(EncryptionLevel.Encrypted)));

这应该让你继续。另外 - 确保你坚持使用 neo4j:// 协议，因为它会正确地路由你。

使用 .NET Core 2.2 网络连接到 Neo4j Aura api

Connecting to Neo4j Aura with .NET Core 2.2 web api

neo4j

neo4j-aura