C# - 从 JSON 反序列化，结果总是一个空对象答案

【问题标题】：C# - deserialization from JSON, result is always an empty objectC# - 从 JSON 反序列化，结果总是一个空对象
【发布时间】：2018-05-28 08:29:18
【问题描述】：

我尝试从 JSON 字符串中读取 c# 中的对象 - 但结果始终是一个空对象，没有任何异常 - 但我没有看到错误

我从网络服务获得的 JSON 字符串是

{  
   "CustomUserFields":{
   },
   "CustomApplicationFields":{    
   },
   "Attachments":[    
   ],
   "Tags":[    
   ],
   "HasModifyEntriesAccess":true,
   "HasViewEntryContentsAccess":true,
   "CommentPrompts":{  
      "AskForCommentOnViewPassword":false,
      "AskForCommentOnViewOffline":false,
      "AskForCommentOnModifyEntries":false,
      "AskForCommentOnMoveEntries":false,
      "AskForCommentOnMoveFolders":false,
      "AskForCommentOnModifyFolders":false
   },
   "Id":"c51ca807-9e01-4652-95d0-645a0914b1ba",
   "Name":"SecondOne",
   "Username":"Second@test.domain",
   "Password":null,
   "Url":"",
   "Notes":"Bla Bla Bla",
   "GroupId":"1182570d-d22d-4f2a-babb-3dab4ff48852",
   "Created":"2018-02-27T14:39:15+01:00",
   "Modified":"2018-02-27T14:39:15+01:00",
   "Expires":null,
   "UsageComment":null
}

我的代码是这样的

DataContractJsonSerializer serF = new DataContractJsonSerializer(typeof(Credential));
Credential cred1 = new Credential();
MemoryStream msF = new MemoryStream(Encoding.UTF8.GetBytes(response2.Content));
cred1 = serF.ReadObject(msF) as Credential;
msF.Close();

[Serializable, XmlRoot("Credential"), DataContract(Name = "Credential")]
public class Credential
{
    [DataMember]
    public Guid id = Guid.Empty;
    [DataMember]
    public Guid groupid = Guid.Empty;
    [DataMember]
    public string name = String.Empty;
}

我从类中删除了一些属性以简化代码阅读 - 但这没有区别

Credential 对象 cred1 始终具有空属性

【问题讨论】：

现在不确定，反序列化是否区分大小写？公元前。你有小写和 JSON 作为 CamelCase 的属性。
您使用了response2，这在您的代码中是不可能看到定义的，但这不应该是一个请求对象吗？
还使用using 块作为流，以确保所有内容都将被关闭/处置，这样如果你不小心就不会引入内存泄漏

标签： c# json deserialization

【解决方案1】：

来自 Json 的 C# 类（通过：http://json2csharp.com/ 自动生成）：

public class CustomUserFields
{
}

public class CustomApplicationFields
{
}

public class CommentPrompts
{
    public bool AskForCommentOnViewPassword { get; set; }
    public bool AskForCommentOnViewOffline { get; set; }
    public bool AskForCommentOnModifyEntries { get; set; }
    public bool AskForCommentOnMoveEntries { get; set; }
    public bool AskForCommentOnMoveFolders { get; set; }
    public bool AskForCommentOnModifyFolders { get; set; }
}

public class RootObject
{
    public CustomUserFields CustomUserFields { get; set; }
    public CustomApplicationFields CustomApplicationFields { get; set; }
    public List<object> Attachments { get; set; }
    public List<object> Tags { get; set; }
    public bool HasModifyEntriesAccess { get; set; }
    public bool HasViewEntryContentsAccess { get; set; }
    public CommentPrompts CommentPrompts { get; set; }
    public string Id { get; set; }
    public string Name { get; set; }
    public string Username { get; set; }
    public object Password { get; set; }
    public string Url { get; set; }
    public string Notes { get; set; }
    public string GroupId { get; set; }
    public DateTime Created { get; set; }
    public DateTime Modified { get; set; }
    public object Expires { get; set; }
    public object UsageComment { get; set; }
}

看看是否区分大小写

【讨论】：