How to use Default parameter values in Lua

[gamefang]

Hi Tony,

I have registered some Cs functions to Lua, with some parameters like:

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// csharp: Func(string a, int b=0)
Lua.RegisterFunction(nameof(Func), this, SymbolExtensions.GetMethodInfo(() => Func(string.Empty, 0)));

Now I use this in Dialogue Database like so:

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// lua
Func("blah")	// TargetParameterCountException: Number of parameters specified does not match the expected number.
Func("blah", 0)	// it's ok, but too long

Can I just omit some parameters to make that easier?(omitted parameters can be placed at the end)

[Tony Li]

Hi,

No, Lua syntax doesn't allow optional parameters. Register two C# separate methods with Lua. Example:

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Lua.RegisterFunction(nameof(Func), this, SymbolExtensions.GetMethodInfo(() => Func(string.Empty, 0)));
Lua.RegisterFunction(nameof(Func2), this, SymbolExtensions.GetMethodInfo(() => Func(string.Empty)));
...
void Func2(string s)
{
    Func(s, 0);
}

[gamefang]

It's a good idea, thanks a lot!

[Tony Li]

Glad to help!