chore: import upstream snapshot with attribution

dotnet/samples/Demos/AotCompatibility/KernelFunctionSamples.cs

@@ -0,0 +1,47 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.Text.Json;
+using Microsoft.Extensions.Configuration;
+using Microsoft.SemanticKernel;
+using SemanticKernel.AotCompatibility.JsonSerializerContexts;
+using SemanticKernel.AotCompatibility.Plugins;
+
+namespace SemanticKernel.AotCompatibility;
+
+/// <summary>
+/// This class contains samples of how to create and invoke kernel functions in AOT applications.
+/// </summary>
+internal static class KernelFunctionSamples
+{
+    /// <summary>
+    /// Creates a kernel function from a lambda and invokes it.
+    /// </summary>
+    /// <remarks>
+    /// Other overloads of KernelFunctionFactory.CreateFromMethod can also be used to create functions,
+    /// as well as the Kernel.CreateFunctionFromMethod extension methods.
+    /// </remarks>
+    public static async Task CreateFunctionFromLambda(IConfigurationRoot _)
+    {
+        Kernel kernel = new();
+
+        // Create JsonSerializerOptions with custom JsonSerializerContexts for the Location and Weather types that are used in the lambda below.
+        // This is necessary for JsonSerializer to infer the type information for these types in AOT applications.  
+        JsonSerializerOptions options = new();
+        options.TypeInfoResolverChain.Add(WeatherJsonSerializerContext.Default);
+        options.TypeInfoResolverChain.Add(LocationJsonSerializerContext.Default);
+
+        // Create a kernel function.
+        KernelFunction function = KernelFunctionFactory.CreateFromMethod(
+            method: (Location location) => location.City == "Boston" ? new Weather { Temperature = 61, Condition = "rainy" } : throw new NotImplementedException(),
+            jsonSerializerOptions: options);
+
+        // Invoke the function
+        KernelArguments arguments = new() { ["location"] = new Location("USA", "Boston") };
+
+        FunctionResult functionResult = await function.InvokeAsync(kernel, arguments);
+
+        // Display the result
+        Weather weather = functionResult.GetValue<Weather>()!;
+        Console.WriteLine($"Temperature: {weather.Temperature}, Condition: {weather.Condition}");
+    }
+}