WPF C# adding event handler programmatically

Question

In my code I create an array of TextBoxes :

namespace TCalc
{
    public partial class MainWindow : Window
    {
        public TextBox[] pubAltArray;

        public MainWindow()
        {
            InitializeComponent();

            pubAltArray = new TextBox[10];

Then I create the TextBoxes programmatically using the following code :

private void generatePublishedTxtBox()
{
    for (int i = 0; i < 10; i++)
    {
        TextBox pubAlt = new TextBox();
        grid_profile.Children.Add(pubAlt);
        pubAlt.SetValue(Grid.RowProperty, 1);
        ...
        pubAltArray[i] = pubAlt;
    }
}

Than I have some routine I want to run when the content of each TextBox changes :

private void doTheStuff(object sender, TextChangedEventArgs e)
{
...
}

So I tried to add event handler during the definition of new TextBox however without success :

pubAlt.TextChanged += new System.EventHandler(doTheStuff());

or

pubAlt.TextChanged += RoutedEventHandler(calculateCorAlts());

Any hint for me?

this is a basic understanding about c# other than anything else. I can imagine that you'll have a hard time experiencing WPF (unless you are some XAML designer but now want to learn C#). — Hopeless
– Hopeless, Commented Oct 7, 2015 at 23:58
Carefully inspect what the debugger says and google it before ask here. — dytori
– dytori, Commented Oct 8, 2015 at 6:35

K Mehta · Accepted Answer · 2015-10-08 00:08:07Z

2

Try:

pubAlt.TextChanged += new TextChangedEventHandler(doTheStuff);

or:

pubAlt.TextChanged += doTheStuff;

Both lines do the same thing. The second one is just shorthand for the first line since it makes code easier to read.

edited Oct 8, 2015 at 0:08

answered Oct 8, 2015 at 0:02

K Mehta

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4 Comments

lukas.kurka Over a year ago

That is actually what I have there, made and error when trying to simplify the code for the question. Anyway I receive an error CS0123 C# No overload for 'doTheStuff' matches delegate 'TextChangedEventHandler'. Thanks

K Mehta Over a year ago

your doTheStuff method must have the following signature: void doTheStuff(object sender, System.Windows.Controls.TextChangedEventArgs e). Make sure that the namespace you're using for TextChangedEventArgs is correct.

lukas.kurka Over a year ago

This actually did the stuff! Could you please explain why do I need to add the System.Windows.Controls in such case?

K Mehta Over a year ago

You should read up on namespaces. There is plenty of information available on the web. That'll answer your question.

123 456 789 0 · Accepted Answer · 2015-10-08 17:08:37Z

0

You are invoking the method using (). Change your code to be like this:

pubAlt.TextChanged += new System.EventHandler((s,e) => doTheStuff());
pubAlt.TextChanged += RoutedEventHandler((s,e) =>calculateCorAlts());

Your method are not matching what it was asking for.

edited Oct 8, 2015 at 17:08

answered Oct 8, 2015 at 0:24

123 456 789 0

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2 Comments

lukas.kurka Over a year ago

That is actually what I have there, made and error when trying to simplify the code for the question. Anyway I receive an error CS0123 C# No overload for 'doTheStuff' matches delegate 'TextChangedEventHandler' Thanks

123 456 789 0 Over a year ago

I updated the code. I assume you had your parameter the same as the event handler.

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