使用c#中的Neo4jClient在Neo4j中创建节点之间的关系

我使用。net Neo4jClient (http://hg.readify.net/neo4jclient/wiki/Home)与Neo4j一起工作。在我的代码中，节点是机场，关系是航班。

如果我想同时创建节点和关系，我可以使用以下代码:

public class Airport
{
    public string iata { get; set; }
    public string name { get; set; }
}
public class flys_toRelationship : Relationship, IRelationshipAllowingSourceNode<Airport>, IRelationshipAllowingTargetNode<Airport>
{
    public static readonly string TypeKey = "flys_to";
    // Assign Flight Properties
    public string flightNumber { get; set; }
    public flys_toRelationship(NodeReference targetNode)
        : base(targetNode)
    { }
    public override string RelationshipTypeKey
    {
        get { return TypeKey; }
    }
}

主要

// Create a New Graph Object
var client = new GraphClient(new Uri("http://localhost:7474/db/data"));
client.Connect();
// Create New Nodes
var lax = client.Create(new Airport() { iata = "lax", name = "Los Angeles International Airport" });
var jfk = client.Create(new Airport() { iata = "jfk", name = "John F. Kennedy International Airport" });
var sfo = client.Create(new Airport() { iata = "sfo", name = "San Francisco International Airport" });
// Create New Relationships
client.CreateRelationship(lax, new flys_toRelationship(jfk) { flightNumber = "1" });
client.CreateRelationship(lax, new flys_toRelationship(sfo) { flightNumber = "2" });
client.CreateRelationship(sfo, new flys_toRelationship(jfk) { flightNumber = "3" });

但是，当我想向已经存在的节点添加关系时，问题就出现了。假设我有一个仅由两个节点(机场)组成的图，比如SNA和EWR，我想添加一个从SNA到EWR的关系(航班)。我尝试了以下操作，但失败了:

// Create a New Graph Object
var client = new GraphClient(new Uri("http://localhost:7474/db/data"));
client.Connect();
Node<Airport> departure = client.QueryIndex<Airport>("node_auto_index", IndexFor.Node, "iata:sna").First();
Node<Airport> arrival = client.QueryIndex<Airport>("node_auto_index", IndexFor.Node, "iata:ewr").First();
//Response.Write(departure.Data.iata); <-- this works fine, btw: it prints "sna"
// Create New Relationships
client.CreateRelationship(departure, new flys_toRelationship(arrival) { flightNumber = "4" });

我收到的两个错误如下:

1)参数1:不能从"Neo4jClient"转换。节点'到'Neo4jClient '。NodeReference '

方法"Neo4jClient. graphclient . createrrelationship (Neo4jClient. graphclient . createrrelationship)"的类型参数。noderreference, TRelationship)'不能从用法中推断出来。尝试显式指定类型参数。

错误引用的方法在以下类中:http://hg.readify.net/neo4jclient/src/2c5446c17a65d6e5accd420a2dff0089799cbe16/Neo4jClient/GraphClient.cs?at=default

任何想法?

client.CreateRelationship(departure.Reference, new flys_toRelationship(arrival.Reference) { flightNumber = "4" });