绑定应用程序/ json到POCO对象在asp.net mvc，序列化异常 [英] Binding application/json to POCO object in asp.net mvc, Serialization exception

问题描述

我将json从我的看法传递给我的控制器执行操作的操作。要将发送的json转换为POCO，我使用此操作过滤器：

  public class ObjectFilter：ActionFilterAttribute {
 public Type RootType {get;组; } 
 
 public override void OnActionExecuting（ActionExecutingContext filterContext）{
 IList< ErrorInfo> errors = new List< ErrorInfo>（）; 
 try {
 object o = new DataContractJsonSerializer（RootType）.ReadObject（filterContext.HttpContext.Request.InputStream）; 
 filterContext.ActionParameters [postdata] = o; 
} 
 catch（SerializationException ex）{
 errors.Add（new ErrorInfo（null，ex.Message））; 
} 
 finally {
 filterContext.ActionParameters [errors] = errors.AsEnumerable（）; 
} 
  

}

它使用DataContractJsonSerializer将JSON映射到我的对象。我的动作然后如此装饰：

  [ObjectFilter（RootType = typeof（MyObject））] 
 public JsonResult updateproduct （MyObject postdata，IEnumerable< ErrorInfo>错误）{
 //检查集合中是否有错误！ 
} 
  

所以推测，这里发生了什么，如果序列化有问题将JSON转换为对象的类型（如果字符串不能被解析为十进制类型或类似于例如），则会将错误添加到集合中，然后将该错误传递给视图。然后，可以检查这个集合是否有错误并向客户端报告。

问题是我似乎找不到 领域引起了这个问题。理想情况下，我想回覆这个观点，并说这个字段有问题。 SerializationException类似乎没有提供这种灵活性。

集体SO hivemind如何考虑解决这个问题？

解决方案

这样做如何： Json。 Net
它读取一个JSON字符串，然后将其反序列化到给定的POCO对象。

  string jsonResult = GetJsonStringFromSomeService（）; 
 MyPocoObject myobject = JsonConvert.DeserializeObject&MyPocoObject>（jsonResult）; 
 Console.Write（Damn that easy）; 
  

但是，为了确定错误发生的位置，我不太确定。

I'm passing json back up from my view to my controller actions to perform operations. To convert the json being sent in, to a POCO I'm using this Action Filter:

public class ObjectFilter : ActionFilterAttribute {
public Type RootType { get; set; }

public override void OnActionExecuting(ActionExecutingContext filterContext) {
IList<ErrorInfo> errors = new List<ErrorInfo>();
try {
    object o = new DataContractJsonSerializer(RootType).ReadObject(filterContext.HttpContext.Request.InputStream);
    filterContext.ActionParameters["postdata"] = o;
    }
catch (SerializationException ex) {
    errors.Add(new ErrorInfo(null, ex.Message));
}
finally {
    filterContext.ActionParameters["errors"] = errors.AsEnumerable();
}

}

It's using the DataContractJsonSerializer to map the JSON, over to my object. My Action is then decorated like so:

[ObjectFilter(RootType = typeof(MyObject))]
public JsonResult updateproduct(MyObject postdata, IEnumerable<ErrorInfo> errors) {
    // check if errors has any in the collection!
}

So to surmise, what is going on here, if there is a problem serializing the JSON to the type of object (if a string cannot be parsed as a decimal type or similar for eg), it adds the error to a collection and then passes that error up to the view. It can then check if this collection has an errors and report back to the client.

The issue is that I cannot seem to find out which field has caused the problem. Ideally I'd like to pass back to the view and say "THIS FIELD" had a problem. The SerializationException class does not seem to offer this sort of flexibility.

How would the collective SO hivemind consider tackling this problem?

解决方案

How about this: Json.Net It reads a JSON string and then Deserialises it to the given POCO object.

string jsonResult = GetJsonStringFromSomeService();
MyPocoObject myobject = JsonConvert.DeserializeObject<MyPocoObject>(jsonResult);
Console.Write("Damn that is easy");

But for the determing where errors occur, I am not too sure.

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