How to make an array in C# for a GUI?

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I have this array in C# for a GUI, however is not displaying all the numbers, just the last one. Any ideas, please? Thanks

private void button4_Click(object sender, EventArgs e)
{
double[] BMI = {18.5,24.9,25,29.9,30};

for (int i = 0; i < BMI.Length; i++)
{
label10.Text = ($"{BMI[i]}");
}
}

What I have tried:

I have tried label10.Text = i.String and label10.Text = BMI.String

Posted 21-Jul-21 14:24pm

Diasalva5

Updated 22-Jul-21 6:47am

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Dave Kreskowiak · Accepted Answer · 2021-07-21T16:32:00

It's only showing the last value because that's exactly what you told it to do. When you set the Text property of a control, you are telling it to replace the previous value with a new value, NOT append to the end of the text.

The TextBox will NOT update as you set new values. Since your code to change the Text property is running on the UI thread, the UI will not update (repaint) until the code goes back to idle, waiting for the user to click on something.

If you want to show each value in the loop, you have to move the method code to a background thread. You can use a BackgroundWorker[^] to do that.

OriginalGriff · Accepted Answer · 2021-07-21T18:34:00

As Dave says, a textbox only has one Text property, and if you overwrite it, you lose teh previous content.

If you want to display all the numbers in a single text box, then you either need to add a separator such as a comma or use a multiline textbox.
The separator is pretty simple:

C#

MyTextBox.Text = string.Join(", ", BMI);

But rather than use a multiline textbox, I'd suggest you use a data control such as a DataGridView which can display data in a tabular form.

Diasalva5 · Accepted Answer · 2021-07-22T06:47:00

Solution 4

I did as advised by OriginalGriff and it worked as expected,Thanks.

private void button4_Click(object sender, EventArgs e)
{
double[] BMI = {18.5,24.9,25,29.9,30};

for (int i = 0; i < BMI.Length; i++)
{

label10.Text = string.Join(" , ", BMI);
}
}

Posted 22-Jul-21 6:47am

Diasalva5

Comments

OriginalGriff 22-Jul-21 13:26pm

No, you don't need the loop at all ...

Diasalva5 22-Jul-21 18:24pm

Hello, OriginalGriff!
So, the loop is not needed?
Thanks

How to make an array in C# for a GUI?

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