neo4jclient获取节点标签

Question

How do i get the labels of a node with Neo4jClient library

this is the code i ran and it returned the following error

The return expression that you have provided uses methods other than those defined by ICypherResultItem, Neo4jClient.Cypher.All or Neo4jClient.Cypher.Return. The return expression needs to be something that we can translate to Cypher, then send to the server to be executed. You can't use chains of methods, LINQ-to-objects, or other constructs like these. If you want to run client-side logic to reshape your data in .NET, use a Select call after the query has been executed, like .Return(…).Results.Select(r => …). This technique maintains a clear separation between what is being executed server-side (in Neo4j, via Cypher) versus client-side (back in .NET).

my code

public List<string> getLabels(MyEvent targetEvent)
{
    List<string> result = 
                        this.client.Cypher.Match("(newE:MyEvent)")
                            .Where((MyEvent newE) => newE.myid == targetEvent.myid)
                            .Return(newE=> newE.Labels().ToString())
                            .Results.ToList();
                    return result;
}

Answer 1

The docs section " Get all labels for a specific user " show this code:

graphClient.Cypher
    .Match("(user:User)")
    .Where((User user) => user.Id == 1234)
    .Return(user => user.Labels())
    .Results

Based in the error message in the question, I believe you only need to remove the toString() from the return, like this:

public List<string> getLabels(MyEvent targetEvent)
{
    List<string> result = this.client.Cypher.Match("(newE:MyEvent)")
        .Where((MyEvent newE) => newE.myid == targetEvent.myid)
        .Return( newE=> newE.Labels() )
        .Results.ToList();
        return result;
}