Why Does Json.NET Throw an 'Unexpected Character Encountered' Error During Deserialization?

Deserialization Error: "Unexpected Character Encountered" in Json.NET

When using Json.NET with C#, it is possible to encounter an exception with the message "Unexpected character encountered while parsing value." This error typically occurs because the provided input is not in a valid JSON format.

In the given case, the issue lies in the deserialization step. The code attempts to deserialize a file path into a ViewerStatsFormat object using the following line:

ViewerStatsFormat current = JsonConvert.DeserializeObject<ViewerStatsFormat>(tmpfile);

However, JsonConvert.DeserializeObject expects a JSON string as input, not a file path. The value of tmpfile likely contains a string representing the path to a file on disk, which is not valid JSON.

To resolve this issue, the file should be read into a string and then deserialized using JsonConvert.DeserializeObject:

string fileContents = File.ReadAllText(tmpfile);
ViewerStatsFormat current = JsonConvert.DeserializeObject<ViewerStatsFormat>(fileContents);

Alternatively, the File.ReadAllText() function can be used directly in the deserialization call:

ViewerStatsFormat current = JsonConvert.DeserializeObject<ViewerStatsFormat>(File.ReadAllText(tmpfile));

By ensuring that the input to DeserializeObject is valid JSON, the "Unexpected character encountered" error can be avoided.

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