Bind an object with array variable

Question

I know there are 100 questions about it, but I have not found an answer to this specific case.

I have an object that looks like this:

public string LogMessage { get; set; }
public DateTime Time { get; set; }        
public string[] Params { get; set; }

and I want to bind this object to datagrid (each object will be a row and each variable will be cell)

I tried to bind like this:

DataGridTextColumn Log = new DataGridTextColumn();
DataGridTextColumn Time = new DataGridTextColumn();
DataGridTextColumn Params = new DataGridTextColumn();
win.Table.Columns.Add(Time);
win.Table.Columns.Add(Log);
win.Table.Columns.Add(Params);
Time.Binding = new Binding("Time");
Log.Binding = new Binding("LogMessage");
Params.Binding = new Binding("Params");

But the result of the Params column is of course:"String[] Array".

I need to know if there is some option to manipulate the data after the bind. Something like:

new Binding("Params").ToJson();

Thanks!

remove all that code and create a proper ViewModel for this. then just bind the UI normally (via XAML) and not using procedural code. — Fede
– Fede, Commented Dec 17, 2013 at 15:47
I know this is the right way, but realy? there is no other options? — Yaron
– Yaron, Commented Dec 17, 2013 at 15:54
Because it's a small program and not really importance one.. so not optimal but easy solution would be enough — Yaron
– Yaron, Commented Dec 17, 2013 at 16:07
In a ListView GridView you could bind the array to a ComboBox or List. Or create a property that just returns the array as a single concatenated text. — paparazzo
– paparazzo, Commented Dec 17, 2013 at 17:02

McGarnagle · Accepted Answer · 2013-12-17 17:26:10Z

There are probably several ways to do this. If you're able to change the class, then you could simply add a new property and bind to that:

public string[] ParamsString
{ 
    get { return string.Join(", ", Params); }
}

Alternatively, if you can't change the class, then you could create an IValueConverter that converts the array into the value you want. For example:

public class ArrayToStringConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        string[] input = value as string[];
        if (input != null && input.Length > 0)
            return string.Join(", ", input);
        return "";
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

Now you can add the converter to the binding like this:

Params.Binding = new Binding("Params") { Converter = new ArrayToStringConverter() };

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