如何在C＃中将json转换为类对象 [英] How to convert json in to class object in C#

问题描述

RetrieveData.dll中出现'System.InvalidCastException'类型的异常，但未在用户代码中处理



附加信息：无法转换类型为'的对象System.Collections.Generic.Dictionary`2 [System.String，System.Object]'输入'RetrieveData.Models.FlightDetails'。



我是什么尝试过：



尝试将json数据转换为类对象上面的飞行细节i发布错误请帮助 -

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XmlDocument doc = new XmlDocument（）;

doc.LoadXml（dep）;

string jsonText = JsonConvert .SerializeXmlNode（doc）;



// DataTable tester =（DataTable）JsonConvert.DeserializeObject（jsonText，（typeof（DataTable）））;

var table = JsonConvert.DeserializeAnonymousType（jsonText，new {Makes = default（DataTable）}）。Makes;

JavaScriptSerializer json_serializer = new JavaS criptSerializer（）;

FlightDetails routes_list =（FlightDetails）json_serializer.DeserializeObject（jsonText）;

解决方案

首先查看json包含的内容。这可能有所帮助： json2csharp - 从json生成c＃类 [ ^ ] - 它从JSON字符串生成C＃clases，然后您可以使用（或比较）应用程序中的类。



我？我使用Newtonsoft，在那里创建实例并填充它们很简单：

 MyClass mc = Newtonsoft.Json.JsonConvert.DeserializeObject< MyClass>（jsonString）; 

其中MyClass可以是任何东西：List< T>，一个单独的类实例，无论你JSON包含什么。

我有一篇文章，我根据这里的问题放在一起。它涵盖了您需要的所有内容：在C＃中使用JSON& VB [ ^ ]

An exception of type 'System.InvalidCastException' occurred in RetrieveData.dll but was not handled in user code

Additional information: Unable to cast object of type 'System.Collections.Generic.Dictionary`2[System.String,System.Object]' to type 'RetrieveData.Models.FlightDetails'.

What I have tried:

try to Convert json Data to Class Object Flight Details above i Post the Error Please help-


XmlDocument doc = new XmlDocument();
doc.LoadXml(dep);
string jsonText = JsonConvert.SerializeXmlNode(doc);

// DataTable tester = (DataTable)JsonConvert.DeserializeObject(jsonText, (typeof(DataTable)));
var table = JsonConvert.DeserializeAnonymousType(jsonText, new { Makes = default(DataTable) }).Makes;
JavaScriptSerializer json_serializer = new JavaScriptSerializer();
FlightDetails routes_list = (FlightDetails)json_serializer.DeserializeObject(jsonText);

解决方案

Start by looking at what the json contains. This may help: json2csharp - generate c# classes from json[^] - it generates C# clases from a JSON string that you can then use (or compare with) the classes in your app.

Me? I use Newtonsoft, where creating the instances and filling them is simple:

MyClass mc = Newtonsoft.Json.JsonConvert.DeserializeObject<MyClass>(jsonString);

where MyClass can be anything: List<T>, a single class instance, whatever you JSON contains.

I have an article that I put together based on questions here. It covers all that you need: Working with JSON in C# & VB[^]

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