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

问题描述

我传递回JSON从我的观点我的控制器动作来执行操作。要转换在发送的JSON，到POCO我用这个动作过滤器：

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();
}

}

这是使用DataContractJsonSerializer映射的JSON，到我的对象。我的行动是再点缀，像这样：

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!
}

所以要猜测，什么是怎么回事，如果有序列化JSON到对象的类型（如字符串不能被解析为十进制类型或如类似的）一个问题，它增加了错误的集合然后再将这个错误直到视图。然后，它可以检查，如果此集合有一个错误，并报告给客户端。

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.

问题是，我似乎无法找出的这字段造成的问题。理想情况下，我想回传给视图，并说：这个领域出现了问题。该SerializationException类似乎没有提供这种灵活性。

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.

如何将集体SO HiveMind的考虑解决这个问题？

How would the collective SO hivemind consider tackling this problem?

推荐答案

这个怎么样： Json.Net
它读取一个JSON字符串，然后将其Deserialises给定的POCO对象。

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");

但对于那些出现错误的determing，我也不太清楚。

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

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