Serializing mixed type Collections

[Deleted user]

Hi there,

I was expecting mixed type Collections to work, yet I am getting the following exception when I try

var list = new object[] { "hello", 4.854, "dio" };
CborArray test = CborArray.FromCollection(list);

System.InvalidCastException
  HResult=0x80004002
  Message=Unable to cast object of type 'Dahomey.Cbor.Serialization.Converters.StringConverter' to type 'Dahomey.Cbor.Serialization.Converters.IObjectConverter'.
  Source=Dahomey.Cbor
  StackTrace:
   at Dahomey.Cbor.Serialization.Converters.ObjectConverter`1.Write(CborWriter& writer, T value, LengthMode lengthMode) in D:\Dahomey.Cbor\Dahomey.Cbor\src\Dahomey.Cbor\Serialization\Converters\ObjectConverter.cs:line 252
   at Dahomey.Cbor.Serialization.Converters.CborConverterBase`1.Write(CborWriter& writer, T value) in D:\Dahomey.Cbor\Dahomey.Cbor\src\Dahomey.Cbor\Serialization\Converters\CborConverter.cs:line 32
   at Dahomey.Cbor.Serialization.Converters.ArrayConverter`1.WriteArrayItem(CborWriter& writer, WriterContext& context) in D:\Dahomey.Cbor\Dahomey.Cbor\src\Dahomey.Cbor\Serialization\Converters\ArrayConverter.cs:line 104
   at Dahomey.Cbor.Serialization.CborWriter.WriteArray[TC](ICborArrayWriter`1 arrayWriter, TC& context) in D:\Dahomey.Cbor\Dahomey.Cbor\src\Dahomey.Cbor\Serialization\CborWriter.cs:line 260
   at Dahomey.Cbor.Serialization.Converters.ArrayConverter`1.Write(CborWriter& writer, TI[] value, LengthMode lengthMode) in D:\Dahomey.Cbor\Dahomey.Cbor\src\Dahomey.Cbor\Serialization\Converters\ArrayConverter.cs:line 68
   at Dahomey.Cbor.Serialization.Converters.CborConverterBase`1.Write(CborWriter& writer, T value) in D:\Dahomey.Cbor\Dahomey.Cbor\src\Dahomey.Cbor\Serialization\Converters\CborConverter.cs:line 32
   at Dahomey.Cbor.ObjectModel.CborArray.FromCollection[T](T collection, CborOptions options) in D:\Dahomey.Cbor\Dahomey.Cbor\src\Dahomey.Cbor\ObjectModel\CborArray.cs:line 188
   at CosmosPal.Program.DeserializeFromFileStream() in D:\repos\powershell\vs2019\CosmosPal\CosmosPal\Program.cs:line 67
   at CosmosPal.Program.Main(String[] args) in D:\repos\powershell\vs2019\CosmosPal\CosmosPal\Program.cs:line 125

Am I missing something here? I thought mixed type arrays are part of the CBOR standard, no?

Thanks so much,
N.

[mcatanzariti]

Hi,

Mixed type arrays are supported but CborArray.FromCollection is maint to be used for uniform collections of the same type.
In your specific case, you could use implicit conversion to CborValue mixed with the CborArray constructor from a CborValue array:

CborArray test = new CborArray("hello", 4.854, "dio");

Hope it helps!

[mcatanzariti]

@ardeego

Finally I found a way to support your example:

var list = new object[] { "hello", 4.854, "dio" };
CborArray test = CborArray.FromCollection(list);

in the following commit: f05f1e6