.Net: Serialize ChatHistory for Google Gemini not working

[sophialagerkranspandey]

Discussed in #11388

^{Originally posted by mlefebvre74-dev April 5, 2025}
Hi Everyone,

I am following the following Example 3 in the GeminiFunctionCalling sample code and am able to get all the calledToolResult information into the ChatHistory using the GeminiChatMessageContent. All working great however, when I try to save the ChatHistory by serializing the session using this approach:

`
// Code from Example 3 in GeminiFunctionCalling sample code omitted (See link below)

       ChatHistory chatHistory;

        var options = new JsonSerializerOptions
        {
            WriteIndented = true,
        };
        var jsonHistory = JsonSerializer.Serialize(chatHistory, options);

   var saveChatHistory = JsonSerializer.Deserialize<ChatHistory>(chatHistoryJson, options);

`

https://github.com/microsoft/semantic-kernel/blob/7d9f834130042f4eb50946dbc94667270157b22a/dotnet/samples/Concepts/FunctionCalling/Gemini_FunctionCalling.cs

Can someone please advise how I can save the Gemini Chat history including calledToolResult so I can use it for further calls to the Gemini LLM.

Thank you!

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