Question

使用以下查询，当结果为空时，我得到一个Neo4jclient内部ArgumentException：

graphClient.Cypher
            .Match("(a:Application {Id: {pId}})")
            .WithParams(new { pId = request.Id })
            .With("a")
            .OptionalMatch("(a)-[:Uses]->(db:Database)")
            .ReturnDistinct(db => db.As<DatabaseDto>());

结果是：

Additional information: Neo4j returned a valid response, however Neo4jClient was unable to deserialize into the object structure you supplied.

Include this raw JSON, with any sensitive values replaced with non-sensitive equivalents:


{
  "columns" : [ "db" ],
  "data" : [ [ null ] ]
}


Parameter name: content
  Source=Neo4jClient
  ParamName=content
  StackTrace:
   at Neo4jClient.Serialization.CypherJsonDeserializer`1.Deserialize(String content) in c:\TeamCity\buildAgent\work\5bae2aa9bce99f44\Neo4jClient\Serialization\CypherJsonDeserializer.cs:line 61
   at Neo4jClient.GraphClient.<>c__DisplayClass1e`1.<Neo4jClient.IRawGraphClient.ExecuteGetCypherResultsAsync>b__1d(Task`1 responseTask) in c:\TeamCity\buildAgent\work\5bae2aa9bce99f44\Neo4jClient\GraphClient.cs:line 820
   at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
  InnerException: System.InvalidOperationException
   HResult=-2146233079
   Message=While trying to map some JSON into an object of type ....DatabaseDto, we failed to find an expected property (Id) in the JSON at path data[0][0].

此令牌的JSON块是：

   Source=Neo4jClient
   StackTrace:
        at Neo4jClient.Serialization.CommonDeserializerMethods.Map(DeserializationContext context, Object targetObject, JToken parentJsonToken, IEnumerable`1 typeMappings, Int32 nestingLevel) in c:\TeamCity\buildAgent\work\5bae2aa9bce99f44\Neo4jClient\Serialization\CommonDeserializerMethods.cs:line 321
        at Neo4jClient.Serialization.CommonDeserializerMethods.CreateAndMap(DeserializationContext context, Type type, JToken element, IEnumerable`1 typeMappings, Int32 nestingLevel) in c:\TeamCity\buildAgent\work\5bae2aa9bce99f44\Neo4jClient\Serialization\CommonDeserializerMethods.cs:line 274
        at Neo4jClient.Serialization.CypherJsonDeserializer`1.<>c__DisplayClass1b.<ParseInSingleColumnMode>b__19(JToken row) in c:\TeamCity\buildAgent\work\5bae2aa9bce99f44\Neo4jClient\Serialization\CypherJsonDeserializer.cs:line 175
        at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
        at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
        at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
        at Neo4jClient.Serialization.CypherJsonDeserializer`1.Deserialize(String content) in c:\TeamCity\buildAgent\work\5bae2aa9bce99f44\Neo4jClient\Serialization\CypherJsonDeserializer.cs:line 34
   InnerException: System.InvalidOperationException
        HResult=-2146233079
        Message=Cannot access child value on Newtonsoft.Json.Linq.JValue.
        Source=Newtonsoft.Json
        StackTrace:
             at Newtonsoft.Json.Linq.JToken.get_Item(Object key)
             at Neo4jClient.Serialization.CommonDeserializerMethods.Map(DeserializationContext context, Object targetObject, JToken parentJsonToken, IEnumerable`1 typeMappings, Int32 nestingLevel) in c:\TeamCity\buildAgent\work\5bae2aa9bce99f44\Neo4jClient\Serialization\CommonDeserializerMethods.cs:line 317
        InnerException:

Answer 1

我无法重新创建您在此处遇到的确切异常，但我重新创建了该方案并发现了一个错误。这已在1.0.0.654中修复。

https://github.com/Readify/Neo4jClient/commit/25b8d3701a0745fbb577e81005da8254c0d67f6f

尝试升级。如果有效，请将此答案标记为已接受。如果没有，请执行异常所说的内容并在https://github.com/Readify/Neo4jClient/issues?state=open而不是在StackOverflow上提出问题。

结果为空时ArgumentException

1 个答案: