How to specify a binding path for a params array to a custom indexer?

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I have a singleton localization class with indexer. You can access it like this:

C#

Localize.Current[String key]

I also have a custom Binding class that transforms string into a call to this indexer:

C#

{Translate MyKey}

This will set Mode (OneWay) on my the binding, source to Localize.Current (singleton) and also path to:

C#

[^__b__^$key$]

Where $key$ is evaluated to MyKey. Then it is localized and replaced by a localized value. Now I want to parameterize this binding with additional parameters. So I did this:

C#

Localize.Current[String key, params String[] parameters]
{Translate MyKey, MyParameter1, MyParameter2}

I don't know how to set path in the binding to this. I need a path that contains reference to array something like:

C#

new PropertyPath("[key, $array_placeholder$], values)

Can't finding anything anywhere. Neither in documentation, nor Google. Anyone has experience how to achieve this? What to put instead of $array_placeholder$?

What I have tried:

I've tried:

C#

new PropertyPath("[key, (0)]", values) // where values is String[] from Translate

This doesn't trigger the indexer. It triggers Localize.Current[String key, String parameter] indexer, if I add one, but not an arbitrary amount of arguments.

Posted 15-Feb-21 3:32am

Smart K8

Updated 15-Feb-21 5:33am

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Richard Deeming · Accepted Answer · 2021-02-15T05:33:00

I haven't tried it, but I suspect the binding is ignoring the params modifier on your indexer parameter. It wants a one-to-one mapping from the PathParameters to the indexer parameters - ie: a single string, and a single string array.

Try:

C#

string[] parameters = new string[values.Length - 1];
if (parameters.Length != 0) Array.Copy(values, 1, parameters, 0, parameters.Length);
binding.Path = new PropertyPath("[key, parameters]", values[0], parameters);