.Net: Add JsonElement String to Primitive Implicit Conversion Support (SLM Function Calling)

dotnet/samples/Demos/OllamaFunctionCalling/Program.cs

@@ -21,12 +21,14 @@
 var chatCompletionService = kernel.GetRequiredService<IChatCompletionService>();
 var settings = new OllamaPromptExecutionSettings { FunctionChoiceBehavior = FunctionChoiceBehavior.Auto() };
 
-Console.WriteLine("Ask questions or give instructions to the copilot such as:\n" +
-                    "- Change the alarm to 8\n" +
-                    "- What is the current alarm set?\n" +
-                    "- Is the light on?\n" +
-                    "- Turn the light off please.\n" +
-                    "- Set an alarm for 6:00 am.\n");
+Console.WriteLine("""
+    Ask questions or give instructions to the copilot such as:
+    - Change the alarm to 8
+    - What is the current alarm set?
+    - Is the light on?
+    - Turn the light off please.
+    - Set an alarm for 6:00 am.
+    """);
 
 Console.Write("> ");
 

dotnet/src/SemanticKernel.Core/Functions/KernelFunctionFromMethod.cs

@@ -690,6 +690,22 @@ private static (Func<KernelFunction, Kernel, KernelArguments, CancellationToken,
 
         var converter = GetConverter(type);
 
+        var jsonStringParsers = new Dictionary<Type, Func<string, object>>(12)
+        {
+            { typeof(bool), s => bool.Parse(s) },
+            { typeof(int), s => int.Parse(s) },
+            { typeof(uint), s => uint.Parse(s) },
+            { typeof(long), s => long.Parse(s) },
+            { typeof(ulong), s => ulong.Parse(s) },
+            { typeof(float), s => float.Parse(s) },
+            { typeof(double), s => double.Parse(s) },
+            { typeof(decimal), s => decimal.Parse(s) },
+            { typeof(short), s => short.Parse(s) },
+            { typeof(ushort), s => ushort.Parse(s) },
+            { typeof(byte), s => byte.Parse(s) },
+            { typeof(sbyte), s => sbyte.Parse(s) }
+        };
+
         object? parameterFunc(KernelFunction _, Kernel kernel, KernelArguments arguments, CancellationToken __)
         {
             // 1. Use the value of the variable if it exists.
@@ -710,26 +726,34 @@ private static (Func<KernelFunction, Kernel, KernelArguments, CancellationToken,
 
             object? Process(object? value)
             {
-                if (!type.IsAssignableFrom(value?.GetType()))
+                if (type.IsAssignableFrom(value?.GetType()))
                 {
-                    if (converter is not null)
+                    return value;
+                }
+
+                if (converter is not null && value is not JsonElement or JsonDocument or JsonNode)
+                {
+                    try
                     {
-                        try
-                        {
-                            return converter(value, kernel.Culture);
-                        }
-                        catch (Exception e) when (!e.IsCriticalException())
-                        {
-                            throw new ArgumentOutOfRangeException(name, value, e.Message);
-                        }
+                        return converter(value, kernel.Culture);
                     }
-
-                    if (value is not null && TryToDeserializeValue(value, type, jsonSerializerOptions, out var deserializedValue))
+                    catch (Exception e) when (!e.IsCriticalException())
                     {
-                        return deserializedValue;
+                        throw new ArgumentOutOfRangeException(name, value, e.Message);
                     }
                 }
 
+                if (value is JsonElement element && element.ValueKind == JsonValueKind.String
+                    && jsonStringParsers.TryGetValue(type, out var jsonStringParser))
+                {
+                    return jsonStringParser(element.GetString()!);
+                }
+
+                if (value is not null && TryToDeserializeValue(value, type, jsonSerializerOptions, out var deserializedValue))
+                {
+                    return deserializedValue;
+                }
+
                 return value;
             }
         }

dotnet/src/SemanticKernel.UnitTests/Functions/KernelFunctionFromMethodTests1.cs

@@ -883,6 +883,66 @@ public async Task ItSupportsArgumentsImplicitConversionAsync()
         await function.InvokeAsync(this._kernel, arguments);
     }
 
+    [Fact]
+    public async Task ItSupportsJsonElementArgumentsImplicitConversionAsync()
+    {
+        //Arrange
+        var arguments = new KernelArguments()
+        {
+            ["l"] = JsonSerializer.Deserialize<JsonElement>((long)1),                 //Passed to parameter of type long
+            ["i"] = JsonSerializer.Deserialize<JsonElement>((byte)1),                //Passed to parameter of type int
+            ["d"] = JsonSerializer.Deserialize<JsonElement>((float)1.0),             //Passed to parameter of type double
+            ["f"] = JsonSerializer.Deserialize<JsonElement>((uint)1.0),              //Passed to parameter of type float
+            ["g"] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize(new Guid("35626209-b0ab-458c-bfc4-43e6c7bd13dc"))),   //Passed to parameter of type string
+            ["dof"] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize(DayOfWeek.Thursday)),   //Passed to parameter of type int
+            ["b"] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize("true")),   //Passed to parameter of type bool
+        };
+
+        var function = KernelFunctionFactory.CreateFromMethod((long l, int i, double d, float f, string g, int dof, bool b) =>
+        {
+            Assert.Equal(1, l);
+            Assert.Equal(1, i);
+            Assert.Equal(1.0, d);
+            Assert.Equal("35626209-b0ab-458c-bfc4-43e6c7bd13dc", g);
+            Assert.Equal(4, dof);
+            Assert.True(b);
+        },
+        functionName: "Test");
+
+        await function.InvokeAsync(this._kernel, arguments);
+        await function.AsAIFunction().InvokeAsync(arguments);
+    }
+
+    [Fact]
+    public async Task ItSupportsStringJsonElementArgumentsImplicitConversionAsync()
+    {
+        //Arrange
+        var arguments = new KernelArguments()
+        {
+            ["l"] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize("1")),                 //Passed to parameter of type long
+            ["i"] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize("1")),                //Passed to parameter of type int
+            ["d"] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize("1.0")),             //Passed to parameter of type double
+            ["f"] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize("1.0")),              //Passed to parameter of type float
+            ["g"] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize("35626209-b0ab-458c-bfc4-43e6c7bd13dc")),   //Passed to parameter of type Guid
+            ["dof"] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize("4")),   //Passed to parameter of type int
+            ["b"] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize("false")),   //Passed to parameter of type bool
+        };
+
+        var function = KernelFunctionFactory.CreateFromMethod((long l, int i, double d, float f, Guid g, int dof, bool b) =>
+        {
+            Assert.Equal(1, l);
+            Assert.Equal(1, i);
+            Assert.Equal(1.0, d);
+            Assert.Equal(new Guid("35626209-b0ab-458c-bfc4-43e6c7bd13dc"), g);
+            Assert.Equal(4, dof);
+            Assert.False(b);
+        },
+        functionName: "Test");
+
+        await function.InvokeAsync(this._kernel, arguments);
+        await function.AsAIFunction().InvokeAsync(arguments);
+    }
+
     [Fact]
     public async Task ItSupportsParametersWithDefaultValuesAsync()
     {