Question

我正在为Avro使用.Net库我有C＃的下一课

namespace Test.Avro.Model
{
    [DataContract(Name = "SensorDataValue", Namespace = "Sensors")]
    public class TestNm
    {
        [DataMember(Name = "name")]
        public string name { get; set; }

        [DataMember(Name = "surname", IsRequired = true)] //test to see if IsRequired works
        public string surname { get; set; }

        [DataMember(Name = "country", IsRequired = false)]  //test to see if IsRequired works
        public string country { get; set; }   

    }
}

当我使用SequentialWriter将类编写为avro文件时使用对象容器文件和使用反射（http://azure.microsoft.com/en-us/documentation/articles/hdinsight-dotnet-avro-serialization/的序列化）保留在序列化中时，我在avro文件中获得以下json

Objavro.codecdeflateavro.schemaÆ{
  "type": "record",
  "name": "Sensors.SensorDataValue",
  "fields": [
    {
      "name": "name",
      "type": "string"
    },
    {
      "name": "surname",
      "type": "string"
    },
    {
      "name": "country",
      "type": "string"
    }
  ]
} ...

我想拥有的是

Objavro.codecdeflateavro.schemaÆ{
  "type": "record",
  "name": "Sensors.SensorDataValue",
  "fields": [
    {
      "name": "name",
      "type": "string"
    },
    {
      "name": "surname",
      "type": [
               "string",
                "null"
              ]
    },
    {
      "name": "country",
      "type": [
               "string",
                "null"
              ]
    }
  ]
}...

非常感谢你的帮助。 PS：我能找到的唯一相关信息是https://hadoopsdk.codeplex.com/workitem/53

Answer 1

您可以通过添加属性[NullableSchema]（在Avro库中定义）使属性可为空。 Avro库会忽略IsRequired中的DataMember值。

Avro .Net Serializer忽略属性

1 个答案: