Pass Array as parameter in constructor in xaml

Hi.
I'm trying to pass an Array as an argument to a constructor in xaml, like this:

I'm filling the PartNumberDataList and PartNumberDataListID - arrays with values in the xaml.cs-file.

The constructor i'm calling is in another xaml-file:

public ListViewSearching(String sqlFunction="", string EntrySearchPlaceholder="", ObservableCollection<KeyValuePair<string, string>>[] SearchList = null,
            ObservableCollection<KeyValuePair<string, string>>[] SearchIDlist = null)
        {
            InitializeComponent();
            SqlFunction = sqlFunction;
            SearchDataList = (ObservableCollection<KeyValuePair<string, string>>) SearchList[0];
            SearchDataIDlist = (ObservableCollection<KeyValuePair<string, string>>)SearchIDlist[0];  
            EntrySearch.Placeholder = EntrySearchPlaceholder;
            FillSearchList();
        }

This will not run.
If I remove the arrays (from both xaml-file and constructor), it works fine. So the problem lies in the arrays.
Does anybody know, how to fix it?

Friendly Regards
nbs