C# 序列化/访问ExtensionDataObject

目前，我有一个示例代码，其中有一个类，如下所示：

public partial class PositionData : object, System.Runtime.Serialization.IExtensibleDataObject
    {
        private System.Runtime.Serialization.ExtensionDataObject extensionDataField;
        private string BCRSideField;
        private string ConveyorField;
        private string LineField;
        private string OriginField;
        private string SubConveyorField;

        public System.Runtime.Serialization.ExtensionDataObject ExtensionData
        {
            get
            {
                return this.extensionDataField;
            }
            set
            {
                this.extensionDataField = value;
            }
        }

        [System.Runtime.Serialization.DataMemberAttribute(IsRequired=true)]
        public string BCRSide
        {
            get
            {
                return this.BCRSideField;
            }
            set
            {
                this.BCRSideField = value;
            }
        }

        [System.Runtime.Serialization.DataMemberAttribute(IsRequired=true)]
        public string Conveyor
        {
            get
            {
                return this.ConveyorField;
            }
            set
            {
                this.ConveyorField = value;
            }
        }

        [System.Runtime.Serialization.DataMemberAttribute(IsRequired=true)]
        public string Line
        {
            get
            {
                return this.LineField;
            }
            set
            {
                this.LineField = value;
            }
        }

        [System.Runtime.Serialization.DataMemberAttribute()]
        public string Origin
        {
            get
            {
                return this.OriginField;
            }
            set
            {
                this.OriginField = value;
            }
        }

        [System.Runtime.Serialization.DataMemberAttribute(IsRequired=true)]
        public string SubConveyor
        {
            get
            {
                return this.SubConveyorField;
            }
            set
            {
                this.SubConveyorField = value;
            }
        }
    }

在运行时，将创建此类型的对象，并填充属性ExtensionDataField。但是我怎样才能访问这个对象的值呢

运行时，扩展数据对象的结构如下所示：

我尝试了以下操作，但没有机会访问值“M6\M6\U SC2\U 1”：

    var props = a.GetType().GetProperties(BindingFlags.NonPublic | BindingFlags.Instance);
    foreach (var prop in props)
    {
       var propertieValue =  prop.GetValue(data.Position.ExtensionData, null);
       var subProps = propertieValue.GetType().GetProperties(BindingFlags.NonPublic | BindingFlags.Instance);
       foreach (var subprop in subProps)
       {
          var subPropertieValue = prop.GetValue(data.Position.ExtensionData, null);
       }
     }

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没有人能回答这个问题？没有人能回答这个问题？