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[DotNet variable] StreamContent, probem with serialization

[Used variables]

StreamContent => System.Net.Http.StreamContent

File = > System.IO.File

FileMode => System.IO.FileMode

Hi,

I'm attempting to post a file on a web API.

I try to send the file into a streamcontent like this:

StreamContent := StreamContent.StreamContent(File.Open('PathToMyFile.tar.gz'), FileMode.Open));


Compilation is ok.
When I run the program, NAV says that the server instance is not available anymore. And the event log says that:

Type: System.Runtime.Serialization.SerializationException
Message: <ii>Type 'System.IO.FileStream' with data contract name 'FileStream:schemas.datacontract.org/.../System.IO'
is not expected. Consider using a DataContractResolver if you are using DataContractSerializer or add any types not known 
statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list 
of known types passed to the serializer.</ii>


To do that I'm working with documentation or questions asked about DotNet classes, which I translate to NAV and I think
I'm missing something in the using of StreamContent Class.

Here is an example given on StackOverflow which puts me in this way.

Thanks for your help !

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