NET: How to disable think mode when calling the ollama model

Microsoft.SemanticKernel:

public static async Task Main()
{
    Console.OutputEncoding = System.Text.Encoding.UTF8;
    var builder = Kernel.CreateBuilder();
    var modelId = "gemma4:e4b-it-q4_K_M";
    var endpoint = new Uri("http://localhost:11434");

    builder.Services.AddOllamaChatCompletion(modelId, endpoint);
    var kernel = builder.Build();
    var chatCompletionService = kernel.GetRequiredService<IChatCompletionService>();

    string prompt = "c#写一个计算当前月天数的方法";
    var executionSettings = new OllamaPromptExecutionSettings
    {
        FunctionChoiceBehavior = FunctionChoiceBehavior.Auto(autoInvoke: false),
    };
    var response = await chatCompletionService.GetChatMessageContentAsync(prompt, kernel: kernel, executionSettings: executionSettings);
    Console.Write(response.Content);
}

How to disable think mode when calling the ollama model?

It is recommended to add a method like chatOptions.AddOllamaOption(OllamaOption.Think, false);
Microsoft.Extensions.AI:

public async static Task Main()
{
    OllamaApiClient ollamaClient = new OllamaApiClient(new Uri("http://localhost:11434/"), "gemma4:e4b-it-q4_K_M");

    // 3. 调用 Ollama API
    var client = new Microsoft.Extensions.AI.ChatClientBuilder(ollamaClient)
        .UseFunctionInvocation()
        .Build();

    ChatOptions chatOptions = new()
    {
        Tools = [AIFunctionFactory.Create(QueryDateTime), AIFunctionFactory.Create(SaveFile), AIFunctionFactory.Create(ReadFile)],
    };
    chatOptions.AddOllamaOption(OllamaOption.Think, false);//Disable think
    await foreach (var res in client.GetStreamingResponseAsync("c#写一个计算当前月天数的方法", chatOptions))//，
    {
        Console.Write(res.Text);
    }
}

Start with the Ollama chat-completion integration used by Microsoft.SemanticKernel and the OllamaPromptExecutionSettings shown in the report. Compare its options with the Microsoft.Extensions.AI example, then verify that callers can set the Ollama think option to false and that the model request disables thinking.