neo4j查询极其缓慢

Question

我想使用neo4jclient创建一个图形，我有一个包含2种对象的字典（文档，列表），

Dictionary<Document, List<Concept>>

如你所见，每个文件都有一个概念列表，它们之间必须存在关系（文件）＆lt; - [：IN] - （概念）

 public void LoadNode(Dictionary<Document, List<Concept>> dictionary, GraphClient _client)
{
    var d = dictionary.ToList();
    var t = dictionary.Values;

    string merge1 = string.Format
           ("MERGE (source:{0} {{ {1}:row.Key.Id_Doc }})", "Document", "Name");
    string strForEachDoc = " FOREACH( concept in row.Value | ";
    string merge2 = string.Format
            ("MERGE (target:{0} {{ {1} : concept.Name }})", "Concept", "Name");
    string merge3 = string.Format
            (" MERGE (source)-[ r:{0} ]->(target)", "Exist");
     {_client.Cypher
           .WithParam("coll", d)
           .ForEach("(row in {coll} | " +
                merge1 + " " +
                strForEachDoc + " " +
                merge2 + " " +
                merge3 + "))")
        .ExecuteWithoutResults();
        }

}

需要时间，Visual Studio遇到了一个奇怪的错误

  

“Une exceptiondepremièremexde type'System.AggregateException'   s'est produite dans mscorlib.dll“