Question

I have multiple XAML TextBoxes, each of which manipulate a corresponding value in an array, when the value in the TextBox is changed, using a C# method which dynamically checks which TextBox has called the method.

    <TextBox x:Name="_0_0" TextChanged="_x_y_TextChanged"/>
    <TextBox x:Name="_0_1" TextChanged="_x_y_TextChanged"/>
    <TextBox x:Name="_0_2" TextChanged="_x_y_TextChanged"/>
    // And so on.....

each of which manipulate a corresponding value in an array, when the value in the TextBox is changed, using a C# method which dynamically checks which TextBox has called the method.

    private void _x_y_TextChanged(object sender, TextChangedEventArgs e)
    {
        TextBox current = (TextBox)sender;
        string currentname = current.Name;
        string rowstring = currentname.Substring(1, 1);

        string columnstring = currentname.Substring(3, 1);

        int row = Convert.ToInt32(rowstring);
        int column = Convert.ToInt32(columnstring);

        // I've then detected the name of the textbox which has called it...

So this information can be used to dynamically store information from a TextBox in a corresponding array index – or whatever you want to do with it…

My question however, is:

How can I create a method which uses index locations in my array, to call the relevant TextBox and update its text?

Answer 1

Use FindName(string) to find the text box by name as follows (where container is a control that contains all of the text boxes):

private void UpdateTextBox(int row, int column, string text)
{
    TextBox textBox = container.FindName("_" + row + "_" + column) as TextBox;
    if(textbox != null)
    {
        textbox.Text = text;
    }
}