How to access field from a deserialized list

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Posted on by RadekM

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How can we get the value from deserialized list in X ?

Like below in C# i could do this but how can I access the any value in x ? It don't even shows me fields of my list to get access.

Code below gives me an error "The array indexing syntax can only be applied to X array types. Use the SetValue and GetValue methods on managed array types."

            defaultException defaultException = JsonConvert::DeserializeObject(response);
            Global::Info(strFmt("exception: %1", defaultException.exception.exceptionDetailList[0].exceptionCode));


public class defaultException
    {
        public KSeF_Exception exception { get; set; }
    }

    public class KSeF_Exception
    {
        public string serviceCtx { get; set; }
        public string serviceCode { get; set; }
        public string serviceName { get; set; }
        public string timestamp { get; set;}
        public string referenceNumber { get; set; }
        public List exceptionDetailList { get; set; }
    }
    public class exceptionDetailList
    {
        public int exceptionCode { get; set; }
        public string exceptionDescription { get; set; }
    }

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Martin Dráb 239,399 Most Valuable Professional on at

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The error message already told you how you can access a single element - by calling GetValue() method.

But you usually want to get all elements. If that's the case, you can use an enumerator:

var enumerator = theList.GetEnumerator(); while (enumerator.MoveNext()) { exceptionDetailList = enumerator.Current; }

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RadekM 174 on at

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So I need this enumerator anyway... Yet I just realized that I can't even deserialize it.

defaultException defaultException = JsonConvert::DeserializeObject(response);

Unable to cast object of type 'Newtonsoft.Json.Linq.JObject' to type 'EDI_KSeF.defaultException'.

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Martin Dráb 239,399 Most Valuable Professional on at

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That's because you're calling the non-generic method (DeserializeObject()), which knows nothing about your custom type. The actual method that your C# code is calling is DeserializeObject<defaultException>(), not DeserializeObject(). C# compiler is able to infer the type and you don't have to specify it, but X++ compiler has no such a feature.

The easist solution is not calling JsonConvert directly from X++. Instead, create a method in your EDI_KSeF library that accepts a string and return defaultException. Then you'll call the generic method in C# and you won't have to bother with generics in X++.

Other options exist, of course. For example, you could use the overload of DeserializeObject() that accepts a type as the second argument.

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RadekM 174 on at

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Good explanation. I used the overload but im thinking about the first solution.

Return defaultException would be easy but.. what if I have like 40 other similar objects? Can I manage it all simple by passing the type to one method to get them all? Like something like this?

public Type testobject(string response, Type type) { Type mytype = type; mytype = JsonConvert.DeserializeObject(response); return mytype; }

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Martin Dráb 239,399 Most Valuable Professional on at

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Now, this isn't possible. The type parameter (T in DeserializeObject<T>) must be know at compile-time, therefore you can't set it at runtime from a method parameter. You would have to implement it like below, but then you would need to call a generic method from X , which won't work (AFAIK). It's the same thing as calling DeserializeObject<T>() directly.

public T Deserialize(string response) { return JsonConvert.DeserializeObject(response); }

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RadekM 174 on at

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Well I did it like this and it works for me at least for now.

//X authorisationChallengeResponse authorisationChallengeResponse2 = new authorisationChallengeResponse(); authorisationChallengeResponse2 = initSession.deserializeResponse(response, authorisationChallengeResponse.GetType()); public System.Object deserializeResponse(str response, Type type) { System.Object any = new System.Object(); any = helper.JSONdeserializeAny(response, type); return any; }

//C# public object JSONdeserializeAny(string jSONstring, Type type) { return JsonConvert.DeserializeObject(jSONstring, type); }

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Martin Dráb 239,399 Most Valuable Professional on at

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Then you don't need JSONdeserializeAny() method at all, because it does exactly the same thing as DeserializeObject(). Remember, I suggested either creating a custom method and use the generic method there, or calling the overload of DeserializeObject that accepts a Type as the second parameter.

Also note that there is no point in creating a new object at line 7, because it's never used and the value gets overwritten at the next line.

Your code could be reduce to this:

authorisationChallengeResponse authorisationChallengeResponse2 = new authorisationChallengeResponse(); authorisationChallengeResponse2 = JsonConvert.DeserializeObject(response, authorisationChallengeResponse.GetType());

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RadekM 174 on at

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Sadly I still strugle to create this enumerators...

{ ListEnumerator listenumz; List list = new List(Types::String); list = JsonConvert::DeserializeObject(response, batchInitResponse.GetType()); listenumz = list.getEnumerator(); } public class batchInitResponse { public string timestamp { get; set;} public string referenceNumber { get; set; } public packageSignature packageSignature { get; set; } } public class packageSignature { public string packageName { get; set; } public List packagePartSignatureList { get; set; } } public class packagePartSignatureList { public int ordinalNumber { get; set; } public string partFileName { get; set; } public string url { get; set; } public string method { get; set; } public List headerEntryList { get; set; } } public class headerEntryList { public string key { get; set; } public string value { get; set; } }

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RadekM 174 on at

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How can this possibly work? It just loops endlessly while the value is always null. What to do when in a List is another List? Like above packagePartSignatureList has headerEntryList.

batchInitResponse batchInitResponse = new batchInitResponse(); batchInitResponse = JsonConvert::DeserializeObject(batch, batchInitResponse.GetType()); var values = batchInitResponse.packageSignature.packagePartSignatureList; var value = values.GetEnumerator(); while (value.MoveNext()) { Global::Info(strFmt(" %1", value.current)); }

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Martin Dráb 239,399 Most Valuable Professional on at

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Please use copy&paste to share your code - your screenshot shows different code that you shared above. You could pay attention to letter case when dealing with .NET Interop, despite the fact that X as such is case-insensitive.

Will you get the same result with this code?

System.Collections.IEnumerable signatureList = batchInitResponse.packageSignature.packagePartSignatureList; System.Collections.IEnumerator enumerator = signatureList.GetEnumerator(); while (enumerator.MoveNext()) { info(strFmt("%1", enumerator.Current)); }

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