Here is a C# function to parse JSON into an object without using the JsonReader class:

```c#
public static object ParseJsonToObject(string jsonString)
{
    object result = null;

    try
    {
        // Create a JSON document from the JSON string.
        JsonDocument document = JsonDocument.Parse(jsonString);

        // Deserialize the JSON document into an object.
        result = document.ToObject();
    }
    catch (Exception e)
    {
        // Handle any errors that occur during deserialization.
        Console.WriteLine(e.Message);
    }

    return result;
}
```

This function uses the JsonDocument class to represent the JSON data. The JsonDocument class has a ToObject() method that can be used to deserialize the JSON data into an object.

The function first creates a JSON document from the JSON string. Then, it deserializes the JSON document into an object.

If an error occurs during deserialization, the function catches the exception and prints the error message to the console.
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