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Suppose I have an input stream coming in that is a sequence of objects, like so:

{ "value" : 1}
{ "valueFromOtherType" : 2}
{ "value" : 3}
{ "value" : 4}

How can I deserialize these objects in C#? Using System.Text.Json is preferred, Newtonsoft is fine. It would be straightforward if the data was wrapped in brackets, I could just deserialize into an array. But I don't have control on the incoming data stream.

Using System.Text.Json I could use JsonSerializer.DeserializeAsync, but only after I create my only stream class to wrap the existing data stream with brackets as it comes in. It'd still be a bit undesirable because I have to wait for the entire (synthetic) array to be read before I can look at the first element.

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    Using Json.net you can do this using a JsonTextReader with the SupportMultipleContent flag set to true. See stackoverflow.com/q/38429059/10263. Note the example in the linked question uses a StringReader, but you can substitute a StreamReader instead. Commented Jul 16, 2021 at 22:49
  • Thank you, my googling never would have crossed with that SO title. I would accept it as an answer, but consider value in having this form of the question be googleable and also would like to see if there is a System.Text.Json solution. Commented Jul 16, 2021 at 22:56
  • If you were just looking for a Newtonsoft-only answer I would consider it a duplicate, but since you are really looking for a System.Text.Json solution, I will not vote to close in case someone has a solution for that (I do not). Commented Jul 16, 2021 at 23:03
  • For System.Text.Json perhaps this answer by Nathan to Line delimited json serializing and de-serializing does what you need. That question also has an answer for Json.NET so it might be a true duplicate. Commented Jul 17, 2021 at 0:58
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