Question

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Passing arguments to event handler

I’m trying to handle an event raised from a MenuItem.Click. The catch is, I need some way to pass some custom arguments with it (specifically, two integers representing row and column).

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    ...
    MenuItem froNewChild = new MenuItem();
    froNewChild.Header = "Insert new box";
    froNewChild.Click += new RoutedEventHandler(froNewChild_Click);
    // froNewChild.Click += new RoutedEventHandler(froNewChild_Click, column, row);
    FlowRectangleOptions.Items.Add(froNewChild);
    ...
}

private void froNewChild_Click(object sender, RoutedEventArgs e) //+column & row
{
    FlowDocument.allColumns[column-1].AddFlowRectangle(column, row);
    FlowDocument.ReRenderAll(canvas1);
}

This answer Passing arguments to an event handler would seem to do what I want, but doesn’t work as-is because sender is already defined in this scope. Sadly I don’t know enough yet to work around that problem – advice greatly appreciated!

Answer 1

Assumming “column” and “row” are created in your loaded method, you could just use a Lambda event handler so you can pass the variables in.

    void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {
        //Assumming "column" and "row" are in this block somewhere.
        ...
        MenuItem froNewChild = new MenuItem();
        froNewChild.Header = "Insert new box";
        froNewChild.Click += (s, eArgs) =>
        {
            FlowDocument.allColumns[column - 1].AddFlowRectangle(column, row);
            FlowDocument.ReRenderAll(canvas1);
        };
        FlowRectangleOptions.Items.Add(froNewChild);
        ...
    }