小编JL-*_*epT的帖子

我通过运行以下方法尝试获取结果集时收到错误/异常:

public IEnumerable<NeoProduct> GetAllProductsUnderCategory(int categoryId)
                 {
             var query = neo.Cypher.Match("(c:Category{CategoryId:{id}})<-[*](p:Product)")
    .WithParam("id", categoryId)
    .Return(p => p.As<NeoProduct>()).Results;
            }

正如您所看到的,它是一个返回NeoProducts列表的非常简单的方法.NeoProduct是一个简单的POCO,具有以下属性:

public int CategoryId { get; set; }
    public string CategoryName { get; set; }
    public int ParentCategoryId { get; set; }

堆栈跟踪是:

   [OverflowException: Value was either too large or too small for an Int64.]
       System.Number.ParseInt64(String value, NumberStyles options, NumberFormatInfo numfmt) +14278344
       System.String.System.IConvertible.ToInt64(IFormatProvider provider) +55
       System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider) +14285879
       Neo4jClient.Serialization.CommonDeserializerMethods.CoerceValue(DeserializationContext context, PropertyInfo propertyInfo, JToken value, IEnumerable`1 typeMappings, Int32 nestingLevel) in D:\temp\tmpC806\Neo4jClient\Serialization\CommonDeserializerMethods.cs:101 …

我编写了一个小方法,其唯一目的是检查给定类的属性是否为null.如果属性为null,则创建它的新实例.我实际上已经设置了一个值,我被卡住了:

  public static void CheckIfPropertyIsNull<TEntity>(SomeBusinessEntity someBusinessEntity) where TEntity : new()
    {
        var properties = typeof(SomeBusinessEntity).GetProperties();

        foreach (PropertyInfo propertyInfo in properties)
        {
            Type currentType = propertyInfo.PropertyType;
            if (currentType == typeof(TEntity))
            {
                var propertyData = propertyInfo.GetValue(someBusinessEntity, null);
                if (propertyData == null)

                {
                    object instance = Activator.CreateInstance(typeof(TEntity));

                    // And then?
                    //propertyInfo.SetValue(null, instance);

                    return;
                }
            }
        }
    }

我尝试使用SetValue()方法,但没有运气.