c# - 如何使用 System.Runtime.Serialization.Json 序列化对象列表？

Question

我试图避免使用任何第三方 DLL 将某些数据转换为 JSON。

假设我有课:

public class NodeData {

  public int NodeID { get; set; }
  public int ParentID { get; set; }
  public int Index { get; set; }
  public string FriendlyName { get; set; }

  public NodeData(int nodeID, int parentID, int index, string friendlyName) {
    this.NodeID = nodeID;
    this.ParentID = parentID;
    this.Index = index;
    this.FriendlyName = friendlyName;
  }
}

然后我使用 DataContractJsonSerializer 将构建的 NodeData 对象列表转换为 JSON 字符串，如下所示:

MemoryStream ms = new MemoryStream();
DataContractJsonSerializer ds = new DataContractJsonSerializer(typeof(List<NodeData>));
ds.WriteObject(ms, data);

string jsonString = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();

这将引发 System.Runtime.Serialization.InvalidDataContractException:

Type 'xxx.xxx.NodeData' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. If the type is a collection, consider marking it with the CollectionDataContractAttribute. See the Microsoft .NET Framework documentation for other supported types

如何使用 System.Runtime.Serialization.Json 使我的列表有效以序列化为 JSON？

Answer 1

如错误消息所述，添加 DataContract 和 DataMethod 属性。

[DataContract]  
public class NodeData {
  [DataMember]
  public int NodeID { get; set; }
  [DataMember]
  public int ParentID { get; set; }
  [DataMember]
  public int Index { get; set; }
  [DataMember]
  public string FriendlyName { get; set; }

  public NodeData(int nodeID, int parentID, int index, string friendlyName) {
    this.NodeID = nodeID;
    this.ParentID = parentID;
    this.Index = index;
    this.FriendlyName = friendlyName;
  }
}

这些属性帮助框架知道如何序列化对象。