数据类型及其与 Cypher 类型的映射

var result = await driver.ExecutableQuery("MERGE (p:Person:Troublemaker {name: $name, age: $age}) RETURN p")
    .WithParameters(new { name = "Carla", age = 59 })
    .WithConfig(new QueryConfig(database: "<database-name>"))
    .ExecuteAsync();

var node = result.Result[0].Get<INode>("p");
Console.WriteLine("Labels: {0}", string.Join(", ", node.Labels));
Console.WriteLine("Properties: {0}", string.Join(", ", node.Properties));
Console.WriteLine("Name property: {0}", node.Get<string>("name"));
/*
Labels: Person, Troublemaker
Properties: [name, Carla], [age, 59]
Name property: Carla
*/

var result = await driver.ExecutableQuery(@"
    MERGE (p:Person {name: $name})
    MERGE (friend:Person {name: $friendName})
    MERGE (p)-[r:KNOWS {status: $status, since: date()}]->(friend)
    RETURN r AS friendship
    ")
    .WithParameters(new { name = "Alice", friendName = "Bob", status = "BFF" })
    .WithConfig(new QueryConfig(database: "<database-name>"))
    .ExecuteAsync();

var relationship = result.Result[0].Get<IRelationship>("friendship");
Console.WriteLine($"Type: {relationship.Type}");
Console.WriteLine("Properties: {0}", string.Join(", ", relationship.Properties));
Console.WriteLine("Status property: {0}", relationship.Get<string>("status"));
/*
Type: KNOWS
Properties: [since, 2024-12-22], [status, BFF]
Status property: BFF
*/

using Neo4j.Driver;

const string dbUri = "<database-uri>";
const string dbUser = "<username>";
const string dbPassword = "<password>";

await using var driver = GraphDatabase.Driver(dbUri, AuthTokens.Basic(dbUser, dbPassword));
await driver.VerifyConnectivityAsync();

// Create some :Person nodes linked by :KNOWS relationships
await addFriend(driver, "Alice", "BFF", "Bob");
await addFriend(driver, "Bob", "Fiends", "Sofia");
await addFriend(driver, "Sofia", "Acquaintances", "Alice");

// Follow :KNOWS relationships outgoing from Alice three times, return as path
var result = await driver.ExecutableQuery(@"
    MATCH path=(:Person {name: $name})-[:KNOWS*3]->(:Person)
    RETURN path AS friendshipChain
    ")
    .WithParameters(new { name = "Alice" })
    .WithConfig(new QueryConfig(database: "<database-name>"))
    .ExecuteAsync();

// Extract path from result
var path = result.Result[0].Get<IPath>("friendshipChain");

Console.WriteLine("-- Path breakdown --");
for (var i=0; i<path.Relationships.Count; i++) {
    Console.WriteLine("{0} knows {1} ({2}).",
        path.Nodes[i].Get<string>("name"),
        path.Nodes[i+1].Get<string>("name"),
        path.Relationships[i].Get<string>("status")
    );
}
/*
-- Path breakdown --
Alice knows Bob (BFF).
Bob knows Sofia (Fiends).
Sofia knows Sofia (Acquaintances).
*/

async Task addFriend(IDriver driver, string name, string status, string friendName) {
    await driver.ExecutableQuery(@"
        MERGE (p:Person {name: $name})
        MERGE (friend:Person {name: $friendName})
        MERGE (p)-[r:KNOWS {status: $status, since: date()}]->(friend)
        ")
        .WithParameters(new { name = name, status = status, friendName = friendName })
        .WithConfig(new QueryConfig(database: "<database-name>"))
        .ExecuteAsync();
}