Access text in a textbox by name with a string value

Question

I'm a WPF noob, having moved from WinForms and I'm trying to access the text in a textbox by name with a string, basically I need the WPF version of Controls.Find() and I can't seem to find anything that works. Here's my code;

<TextBox x:Name="amplitude0" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="160" Canvas.Top="64" />
<TextBox x:Name="amplitude1" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" VerticalAlignment="Top" Width="100" Canvas.Left="280" Canvas.Top="64" />

...up to amplitude9. and the C#;

object textBox = new TextBox();

        for (int n = 0; n <= 9; n++)
        {
            txtAmplitude = "amplitude" + n;
            textBox = FindName(txtAmplitude);
            amplitude[n] = textBox.text;
        }

I've tried different functions but can't find anything that works, can someone point me in the right direction?

Thanks in advance

What is your error? What doesn't work? Kind of hard to help without more information. — CodeLikeBeaker
– CodeLikeBeaker, Commented Jan 4, 2017 at 21:40
the error is in the "amplitude[n] = textBox.text;" line - "object does not contain a definition for text and no extension method text" — James Morrison
– James Morrison, Commented Jan 4, 2017 at 21:44

Steve · Accepted Answer · 2017-01-04 21:56:27Z

1

Instead of

amplitude[n] = textBox.text;

what you want is amplitude[n] = ((TextBox) textbox).Text;

This is called casting.

But if you are doing this then you probably is not doing it right. I would suggest you to read more about MVVM design pattern since it is very different from Win form. What you are doing right now can be done easily and cleanly with Binding

Edit:

And object textBox = new TextBox(); is not needed. you don't need to initialize a new TextBox. Should be something like

TextBox textbox;
....
textbox = (TextBox) FindName(....);

edited Jan 4, 2017 at 21:56

answered Jan 4, 2017 at 21:45

Steve

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2 Comments

James Morrison Over a year ago

That's got it, thanks for your help! I'll have to read into it more, it's been a while since moving to new technology

S.Will Over a year ago

I'll add on to this answer, instead of casting, the declaration line should be either var textbox = new TextBox()or TextBox textBox = new TextBox(); unless there is some other reason you want the variable to be an object.

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