CODEWITHSUNDEEP
c#jsonserialization
Alexander
Alexander

Reputation: 20234

Deserialize into an object that extends List<T>

Using 

var serializer = new System.Web.Script.Serialization.JavaScriptSerializer();

the following deserializes my JSON array correctly:

public List<PrintJobTranslation> Translations

and the following doesn't:

public PrintJobTranslations Translations

with

public class PrintJobTranslations : List<PrintJobTranslation>
{
    public string GetTranslation(string Key, string defaultValue)
    {
        var translation = this.FirstOrDefault(x => x.Key == Key);
        if (translation == null) return defaultValue;
        return translation.Translation;
    }
}

It throws the error:

System.Collections.Generic.Dictionary`2[System.String,System.Object] ist kein Wert des Typs Print.printJob.PrintJobTranslation und kann in dieser generischen Sammlung nicht verwendet werden. Parametername: value

I did not find an exact translation, but should be something like this in English:

System.Collections.Generic.Dictionary`2[System.String,System.Object] is not a value of type Print.printJob.PrintJobTranslation and cannot be used in the generic collection. Parameter name: value

How can I get the JSON to deserialize correctly?

Upvotes: 0

Views: 476

Answers (1)

Marc Gravell
Marc Gravell

Reputation: 1063724

One way to side step this completely would be to not do that - your method looks fine as an "extension method", so it'll work like an instance method, but without actually having to subclass anything:

public static class PrintJobTranslationExtensions
{
    public static string GetTranslation(
        this List<PrintJobTranslation> list, string Key, string defaultValue)
    {
        var translation = list.FirstOrDefault(x => x.Key == Key);
        if (translation == null) return defaultValue;
        return translation.Translation;
    }
}

and just use List<PrintJobTranslation> in your code.

Upvotes: 2

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