How to serialize/deserialize List<Tuple<long, string, int>> using JavaScriptSerializer

Question

I have serialized a List<Tuple<long, string, int>> obj using JavaScriptSerializer.

JavaScriptSerializer js = new JavaScriptSerializer();
return js.Serialize(dataToSerialize as IEnumerable);

and I got the string:

[{"Item1":0,"Item2":"UserModifiedId","Item3":1},{"Item1":-1,"Item2":"","Item3":0},{"Item1":-1,"Item2":"","Item3":0}]

When I try to deserialize it using:

JavaScriptSerializer js = new JavaScriptSerializer();
return js.Deserialize<List<T>>(strObject);

I get the following ex:

No parameterless constructor defined for type of 'System.Tuple`3[[System.Int64, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]'.```

Can anyone help me with this Issue (to keep using JavaScriptSerializer)?

Don't use JavaScriptSerializer. It's obsolete. Even ASP.NET Web API and all ASP.NET Core versions up to 2.2 use Json.NET. It's the defacto standard JSON library in .NET. Beyond that, you need to specify the type during deserialization — Panagiotis Kanavos
– Panagiotis Kanavos, Commented Dec 16, 2019 at 10:40

Kai Hartmann · Accepted Answer · 2019-12-16 10:37:59Z

0

The JavaScriptSerializer needs a parameterless constructor to create the objects during deserialization.

Because the class Tuple has none, the deserialization fails.

If you don't bother you can use the NuGet package Newtonsoft.Json, which doesn't have his problem:

var strObject= JsonConvert.SerializeObject(dataToSerialize);

var tupleList = JsonConvert.DeserializeObject<List<Tuple<long, string, int>>>(strObject);

answered Dec 16, 2019 at 10:37

Kai Hartmann

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3 Comments

Albanian Al Over a year ago

Yes, I didn't want to use Newtonsoft.Json

Kai Hartmann Over a year ago

Then you might have to look into DataContractJsonSerializer, as I am afraid JavaScriptSerializer won't work in this case.

Albanian Al Over a year ago

Thnx for the answer

S. Phillips · Accepted Answer · 2019-12-16 10:32:28Z

0

Try specifying the exact type when deserializing

JavaScriptSerializer js = new JavaScriptSerializer();
return js.Deserialize<List<Tuple<long, string, int>>>(strObject);

answered Dec 16, 2019 at 10:32

S. Phillips

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2 Comments

Kai Hartmann Over a year ago

This still suffers from the same problem.

Albanian Al Over a year ago

I tried that, I got the same exception. (Thnx for the answer)

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