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c# - how to pass List<Object> to WCF

I have already configured my Service Reference and set my collection to Generic.List .

When i fill the List<Objects> with a string or int, it works fine. But when I fill it with a List<String>, it gives a runtime-error while trying to serialize parameter

So is there a way to pass a List<Objects> that contains several List<String> to WCF?

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Use the KnownType attribute on your data contract. See Data Contract Known Types.

[KnownType(typeof(List<string>))]
[DataContract]
public class YourClass
{
    [DataMember]
    public List<object> YourList { get; set; }
}

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