create a tagged union in csharp

main.cs
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Explicit)]
public struct TaggedUnion
{
    [FieldOffset(0)] public int tag; // Discriminator field
    [FieldOffset(4)] public int intValue;
    [FieldOffset(4)] public string stringValue;
    [FieldOffset(4)] public float floatValue;

    // Define an enum to represent the different types of values a tagged union can hold
    enum TaggedUnionType { Int, String, Float };

    // Constructor that takes an int value
    public TaggedUnion(int intValue)
    {
        tag = (int)TaggedUnionType.Int;
        this.intValue = intValue;
    }

    // Constructor that takes a string value
    public TaggedUnion(string stringValue)
    {
        tag = (int)TaggedUnionType.String;
        this.stringValue = stringValue;
    }

    // Constructor that takes a float value
    public TaggedUnion(float floatValue)
    {
        tag = (int)TaggedUnionType.Float;
        this.floatValue = floatValue;
    }

    // Helper method to access the value of the tagged union based on its type
    public object GetValue()
    {
        switch ((TaggedUnionType)tag)
        {
            case TaggedUnionType.Int:
                return intValue;
            case TaggedUnionType.String:
                return stringValue;
            case TaggedUnionType.Float:
                return floatValue;
            default:
                throw new InvalidOperationException("Invalid tag value");
        }
    }
}
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