C#: How to deserialize json string to get the same result as webmethod parameter?

Question

now I have some data as below:

{"parameters":{"fields":["a","b","c"]}

and I use ajax to send the request to .net WebMethod like below:

$.ajax({
    url: 'Query/Query.asmx/test2?nocache=1',
                    dataType: "json",
                    data: JSON.stringify(data),
                    type: 'POST',
                    contentType: "application/json; charset=utf-8",

})

and the WebMethod I used in query.asmx is:

[WebMethod]
public string test2(Dictionary<string, object> parameters)
{
    return "ok";
}

we can see that the parameters["fields"] is of type System.Object[]

But now I have a requirement to compress the data and decompress it in backend, and the data becomes a string(after decompressed). Now I want to deserialize it to exact the same type as before.

after decompression, the data becomes a JSON string:

"{\"parameters\":{\"fields\":[\"a\",\"b\",\"c\"]}}"

Now I want to use JavaScriptSerializer to deserialize it to the same type. But What I can get is parameters["fields"] of type System.Collections.ArrayList and not the type System.Object[] I require.

the code is like below

public class TestDataObject
{
    public Dictionary<string, object> parameters { get; set; }
}

-

var serializer = new JavaScriptSerializer();
var a = serializer.Deserialize<TestDataObject>(d);

So the question is: is there a way for me to deserialize it to exactly the same type? I can't use another library since I have got some javascriptSerializer converters implemented for some customized types.

Darjan Bogdan · Accepted Answer · 2018-04-13 06:18:34Z

1

You can change type of value in dictionary to object[] instead of object:

public class TestDataObject
{
    public Dictionary<string, object[]> parameters { get; set; }
}

string json = "{\"parameters\":{\"fields\":[\"a\",\"b\",\"c\"]}}";
var serializer = new JavaScriptSerializer();
var a = serializer.Deserialize<TestDataObject>(json);
a.parameters["fields"].GetType() == typeof(object[]); //equals True

answered Apr 13, 2018 at 6:18

Darjan Bogdan

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2 Comments

Rongrong Luo Over a year ago

thank you for your answer. but in the real case, it has more than one level, I just can't give all nested elements types. sorry I didn't make it clear

Rongrong Luo Over a year ago

and in 'parameters' there are more than this array-like type. It has some other primitive types and nested object.

Stephen Kennedy · Accepted Answer · 2018-04-16 15:58:11Z

1

In JavascriptSerializer, there is a method ConvertToType which can be used to convert an object to a class instance. After DeserializeObject() is called, the result type is exactly what I want. So, the code can be:

    var b = serializer.DeserializeObject(d);
    var c = serializer.ConvertToType(b, typeof(TestDataObject));

edited Apr 16, 2018 at 15:58

Stephen Kennedy

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answered Apr 16, 2018 at 1:25

Rongrong Luo

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