【问题标题】:C# JSON String DeserializationC# JSON 字符串反序列化
【发布时间】:2012-10-06 19:16:18
【问题描述】:

我真的很难在 C# 中找到任何 JSON 反序列化示例,其中每个 JSON 项中的第一个属性是不同的 ID。

    {
       "12112083":{
           "Topic_ID":"12112083",
           "Moved_ID":"51",
           "subject":"subject text goes here"      
           },
       "12111966":{
           "Topic_ID":"12111966",
           "Moved_ID":"51",
           "subject":"another subject text"      
           },
       "12106917":{
           "Topic_ID":"12106917",
           "Moved_ID":"0",
           "subject":"test"      
           }
    }

我尝试了几种不同的方法,但均未成功。返回的我无法控制的 JSON 有时是单个项目,有时是一组项目,如上面的示例。理想情况下,如果可能的话,我想反序列化为一个类型化的对象类。

谢谢

谢谢 L.B

我已尝试通过以下字符串提供的代码示例

    '{"12112083":{"Topic_ID":"12112083","Moved_ID":"51","subject":"Due to a computer virus, many of my files are \u005C"Crypted\u005C",espe","Start_date":"10/6/2012 6:54:37 PM","InitialResponseDueDate":"10/6/2012 7:01:37 PM","Locked":"0","QValue":"$10","Status":"1","Author_ID":"71318191","Question_Text":"Due to a computer virus, many of my files are \u005C"Crypted\u005C",especially my pictures.  Now my FinepixA500 camera will not upload photos to my computer (laptop).  Geek Squad could not crack the code and suggested that I contact Toshiba and have them reset the computer to its original manufacturer settings.  If I do that, I will lose all of my data.  The only thing that appears not to be working is \u005C"photo gallery\u005C". (therefore, my camera will not upload photos anymore.....) Any suggestions?","Username":"JACUSTOMER-iei7o0tr-","No_of_Questions":"0","No_of_Accepts":"0","Last_visit":"10/6/2012 7:22:18 PM","Join_Date":"10/6/2012 6:46:29 PM","lastExpert":"","IsPress":"False","hasCustomerOptOuts":"0","RecCount":"0","OptedOut":"","Urgency":"51","AuthorHasSubscription":"False","Relisted":"0","IsAbandoned":"False","categoryName":"Camera and Video","categoryName_Additional":"Laptop","QuestionCommissionHasAdjusted":"False","LockedBy":"-1","IsOnline":"False","QuestionLink":"/video-camera-repair/77lqr-due-computer-virus-files-crypted-espe.html","WaitingForYou":"False","RequestedForYou":"False","IsChatEnabled":"False","ChangedKeyList":"","DeltaType":"A"},"12111966":{"Topic_ID":"12111966","Moved_ID":"51","subject":"office/outlook for mac 2011 keeps hanging upMicrosoft Error","Start_date":"10/6/2012 6:25:06 PM","InitialResponseDueDate":"10/6/2012 7:25:06 PM","Locked":"0","QValue":"$19","Status":"1","Author_ID":"71317792","Question_Text":"office/outlook for mac 2011 keeps hanging upMicrosoft Error Reporting log version: 2.0<br/><br/>Error Signature:<br/>Exception: EXC_CRASH (SIGTRAP)<br/>Date/Time: 2012-10-06 17:59:38 +0000<br/>Application Name: Microsoft Outlook<br/>Application Bundle ID: com.microsoft.Outlook<br/>Application Signature: OPIM<br/>Application Version: 14.2.4.120824<br/>Crashed Module Name: merp<br/>Crashed Module Version: 2.2.4.120824<br/>Crashed Module Offset: 0x00003aa2<br/>Blame Module Name: Microsoft Outlook<br/>Blame Module Version: 14.2.4.120824<br/>Blame Module Offset: 0x003c900c<br/>Application LCID: 1033<br/>Extra app info: Reg=en Loc=0x0409<br/>Crashed thread: 10","Username":"JACUSTOMER-wr0d1qwb-","No_of_Questions":"0","No_of_Accepts":"0","Last_visit":"10/6/2012 6:54:53 PM","Join_Date":"10/6/2012 6:25:00 PM","lastExpert":"","IsPress":"False","hasCustomerOptOuts":"0","RecCount":"0","OptedOut":"","Urgency":"51","AuthorHasSubscription":"False","Relisted":"0","IsAbandoned":"False","categoryName":"Microsoft Office","categoryName_Additional":"","QuestionCommissionHasAdjusted":"False","LockedBy":"-1","IsOnline":"False","QuestionLink":"/microsoft-office/77lni-office-outlook-mac-2011-keeps-hanging-upmicrosoft-error.html","WaitingForYou":"False","RequestedForYou":"False","IsChatEnabled":"True","ChangedKeyList":"","DeltaType":"A"},"12106917":{"Topic_ID":"12106917","Moved_ID":"0","subject":"test","Start_date":"10/5/2012 6:22:42 PM","InitialResponseDueDate":"10/5/2012 6:40:42 PM","Locked":"0","QValue":"$21","Status":"1","Author_ID":"69617617","Question_Text":"test","Username":"JACUSTOMER-dwbsyao6-","No_of_Questions":"4","No_of_Accepts":"1","Last_visit":"10/6/2012 11:12:19 AM","Join_Date":"7/16/2012 12:59:47 PM","lastExpert":"","IsPress":"False","hasCustomerOptOuts":"0","RecCount":"0","OptedOut":"","Urgency":"0","AuthorHasSubscription":"True","Relisted":"0","IsAbandoned":"False","categoryName":"Computer","categoryName_Additional":"","QuestionCommissionHasAdjusted":"True","LockedBy":"-1","IsOnline":"True","QuestionLink":"/computer/77hr9-test.html","WaitingForYou":"False","RequestedForYou":"False","IsChatEnabled":"True","ChangedKeyList":"","DeltaType":"A"}}'

我收到“InvalidCastException”,无法将“System.String”类型的对象转换为“Newtonsoft.Json.Linq.JObject”类型。

我尝试从字符串的开头和结尾删除单引号,但得到相同的消息?

【问题讨论】:

  • pst - 我在上面的问题中添加了实际的 JSON 字符串。原始 JSON 字符串是经过格式化和精简的版本,以总结我的问题。
  • 我删除了我的 -1。但是,请确保包含问题中使用的实际代码 - 这有助于优化/集中问题。
  • 好的,谢谢,我同意你的观点。这是我的第一篇文章,说实话我可能有点匆忙。

标签: c# .net json deserialization


【解决方案1】:

使用Json.Net

(发布的 JSON 无效。以下工作将无效的 \u005C"s 替换为 \u005C。)

string json = @"{""12112083"":{""Topic_ID"":""12112083"",""Moved_ID"":""51"",""subject"":""Due to a computer virus, many of my files are \u005CCrypted\u005C,espe"",""Start_date"":""10/6/2012 6:54:37 PM"",""InitialResponseDueDate"":""10/6/2012 7:01:37 PM"",""Locked"":""0"",""QValue"":""$10"",""Status"":""1"",""Author_ID"":""71318191"",""Question_Text"":""Due to a computer virus, many of my files are \u005CCrypted\u005C,especially my pictures.  Now my FinepixA500 camera will not upload photos to my computer (laptop).  Geek Squad could not crack the code and suggested that I contact Toshiba and have them reset the computer to its original manufacturer settings.  If I do that, I will lose all of my data.  The only thing that appears not to be working is \u005Cphoto gallery\u005C. (therefore, my camera will not upload photos anymore.....) Any suggestions?"",""Username"":""JACUSTOMER-iei7o0tr-"",""No_of_Questions"":""0"",""No_of_Accepts"":""0"",""Last_visit"":""10/6/2012 7:22:18 PM"",""Join_Date"":""10/6/2012 6:46:29 PM"",""lastExpert"":"""",""IsPress"":""False"",""hasCustomerOptOuts"":""0"",""RecCount"":""0"",""OptedOut"":"""",""Urgency"":""51"",""AuthorHasSubscription"":""False"",""Relisted"":""0"",""IsAbandoned"":""False"",""categoryName"":""Camera and Video"",""categoryName_Additional"":""Laptop"",""QuestionCommissionHasAdjusted"":""False"",""LockedBy"":""-1"",""IsOnline"":""False"",""QuestionLink"":""/video-camera-repair/77lqr-due-computer-virus-files-crypted-espe.html"",""WaitingForYou"":""False"",""RequestedForYou"":""False"",""IsChatEnabled"":""False"",""ChangedKeyList"":"""",""DeltaType"":""A""},""12111966"":{""Topic_ID"":""12111966"",""Moved_ID"":""51"",""subject"":""office/outlook for mac 2011 keeps hanging upMicrosoft Error"",""Start_date"":""10/6/2012 6:25:06 PM"",""InitialResponseDueDate"":""10/6/2012 7:25:06 PM"",""Locked"":""0"",""QValue"":""$19"",""Status"":""1"",""Author_ID"":""71317792"",""Question_Text"":""office/outlook for mac 2011 keeps hanging upMicrosoft Error Reporting log version: 2.0<br/><br/>Error Signature:<br/>Exception: EXC_CRASH (SIGTRAP)<br/>Date/Time: 2012-10-06 17:59:38 +0000<br/>Application Name: Microsoft Outlook<br/>Application Bundle ID: com.microsoft.Outlook<br/>Application Signature: OPIM<br/>Application Version: 14.2.4.120824<br/>Crashed Module Name: merp<br/>Crashed Module Version: 2.2.4.120824<br/>Crashed Module Offset: 0x00003aa2<br/>Blame Module Name: Microsoft Outlook<br/>Blame Module Version: 14.2.4.120824<br/>Blame Module Offset: 0x003c900c<br/>Application LCID: 1033<br/>Extra app info: Reg=en Loc=0x0409<br/>Crashed thread: 10"",""Username"":""JACUSTOMER-wr0d1qwb-"",""No_of_Questions"":""0"",""No_of_Accepts"":""0"",""Last_visit"":""10/6/2012 6:54:53 PM"",""Join_Date"":""10/6/2012 6:25:00 PM"",""lastExpert"":"""",""IsPress"":""False"",""hasCustomerOptOuts"":""0"",""RecCount"":""0"",""OptedOut"":"""",""Urgency"":""51"",""AuthorHasSubscription"":""False"",""Relisted"":""0"",""IsAbandoned"":""False"",""categoryName"":""Microsoft Office"",""categoryName_Additional"":"""",""QuestionCommissionHasAdjusted"":""False"",""LockedBy"":""-1"",""IsOnline"":""False"",""QuestionLink"":""/microsoft-office/77lni-office-outlook-mac-2011-keeps-hanging-upmicrosoft-error.html"",""WaitingForYou"":""False"",""RequestedForYou"":""False"",""IsChatEnabled"":""True"",""ChangedKeyList"":"""",""DeltaType"":""A""},""12106917"":{""Topic_ID"":""12106917"",""Moved_ID"":""0"",""subject"":""test"",""Start_date"":""10/5/2012 6:22:42 PM"",""InitialResponseDueDate"":""10/5/2012 6:40:42 PM"",""Locked"":""0"",""QValue"":""$21"",""Status"":""1"",""Author_ID"":""69617617"",""Question_Text"":""test"",""Username"":""JACUSTOMER-dwbsyao6-"",""No_of_Questions"":""4"",""No_of_Accepts"":""1"",""Last_visit"":""10/6/2012 11:12:19 AM"",""Join_Date"":""7/16/2012 12:59:47 PM"",""lastExpert"":"""",""IsPress"":""False"",""hasCustomerOptOuts"":""0"",""RecCount"":""0"",""OptedOut"":"""",""Urgency"":""0"",""AuthorHasSubscription"":""True"",""Relisted"":""0"",""IsAbandoned"":""False"",""categoryName"":""Computer"",""categoryName_Additional"":"""",""QuestionCommissionHasAdjusted"":""True"",""LockedBy"":""-1"",""IsOnline"":""True"",""QuestionLink"":""/computer/77hr9-test.html"",""WaitingForYou"":""False"",""RequestedForYou"":""False"",""IsChatEnabled"":""True"",""ChangedKeyList"":"""",""DeltaType"":""A""}}";

var jobj = (JObject)JsonConvert.DeserializeObject(json);
var items = jobj.Children()
    .Cast<JProperty>()
    .Select(j=>new
    {
        ID=j.Name,
        Topic = (string)j.Value["Topic_ID"],
        Moved = (string)j.Value["Moved_ID"],
        Subject = (string)j.Value["subject"],
    })
    .ToList();

【讨论】:

  • 感谢 L.B,我已经更详细地编辑了问题以及在尝试上面的代码示例后收到的异常
  • @user1462387 如果你修复了你的json(它是无效的)你会看到上面的coce没有任何异常。
  • 谢谢,我刚刚注意到 JSON 中反斜杠的“\u005C”unicode 字符可能会导致问题。我无法控制提供给我的 JSON,所以我需要以某种方式替换它
  • @user1462387 问题不是\u005C 字符,而是您的json 中的\u005C"
  • @L.B:无法访问它所说的子值,异常。您的解决方案不起作用
【解决方案2】:

使用 System.Web,我有一个小方法似乎适用于每个使用 JSON 进行数据存储的项目:

private T UnpackJson<T>(object data)
{
    var serializer = new JavaScriptSerializer();
    string rawJSON = serializer.Serialize(data);

    var result = serializer.Deserialize<T>(rawJSON);
    return result;
}

...其中 T 是某种类型,其元素与您要反序列化的架构匹配。对于顶部给出的 blob,我建议如下:

// Using my above method...
var x = UnpackJson<Foo[]>(blob);

public class Foo
{
    public string ID;
    public Bar SubItem;
}

public class Bar
{
    public int Topic_ID;
    public int Subject_ID;
    public string subject; 
}

...请注意,您的变量名称应完全与 JSON blob 中的属性名称匹配!我当然希望这行得通(请注意,虽然我使用该方法并且确定它会将 blob 反序列化为类,但此实现未经测试。)

【讨论】:

    【解决方案3】:

    使用 JSON.NET - .NET 的免费 JSON 解析器/序列化器。

    【讨论】:

    • 请在给出的具体结构中包含一个相关的用法示例。
    • 谢谢,我实际上使用的是 JSON.NET,但它是我正在努力反序列化的 JSON 结构
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