1

So, I wanna know how to write the entire content of an array to a textbox by using a foreach loop in C#. My code currently looks like this:

I generate a series of random numbers which are stored in the array:

int[] iData;

Now I want to write the stored data in this array to a textbox by using the foreach loop like this:

        foreach (int myInt in iData)
        {
            txtListing.Text = myInt.ToString();
        }

This will only write the last generated number in the array to the textbox, but my question is how do I write all of them to the tekstbox.

I only know, how to do this with a listbox and a forLoop. But is there any way this can be done with a textbox and a foreach loop?

Improve this question

7 Answers 7

Reset to default
5

Try using the AppendText method instead:

foreach (int myInt in iData)
{
    txtListing.AppendText(myInt.ToString());
}

Another option is to join the elements together as a string:

textListing.Text = string.Join(string.Empty, iData);

...or if you want another delimiter:

textListing.Text = string.Join(", ", iData);
Improve this answer
Sign up to request clarification or add additional context in comments.

Comments

2

You need to append the strings successively.

foreach (int myInt in iData)
        {
            txtListing.Text += myInt.ToString();
        }
Improve this answer

1 Comment

Because .NET (and, indeed Java) strings are immutable, every time you perform a string concatenation, you create a new string instance to put the concatenated string into. In a loop this means allocating dozens of temporary string variables which the garbage collector then has to dispose of. Use a StringBuilder instead.
2

The low tech approach: 

        foreach (int myInt in iData)
        {
            txtListing.Text = txtListing.Text + "; " + myInt.ToString();
        }
Improve this answer

Comments

2

This is writing the content of each item in turn to the text property, which is leaving the last entry in place as there's no further changes.

You're probably best off using String.Join to concatenate all the values together and write to the Text property.

i.e.

String.Join(", ", iData.Select(x => x.ToString()));

As Fredrik pointed out, 

String.Join(", ", iData);

Is neater.

Improve this answer

1 Comment

string.Join takes an object[] and takes care of the conversion, calling LINQ methods is a bit overkill for the task.
0

Try:

foreach (int myInt in iData)
{
    txtListing.Text += myInt.ToString();
}

This should append each value to the .Text property, rather than overwrite it.

Improve this answer

1 Comment

@Massif: True, there are much better ways to do this. Sometimes I find myself thinking those are questions for another day, though. Maybe I'm just too much of a cynic :)
0

1) Set 

 txtListting.MultiLine = true

2) Change code:

 txtListing.Text += myInt.ToString() + "\n";
Improve this answer

Comments

0

First remove null values of the array using linq:

Array = Array.where(x => !string.isNullOrEmpty(x)).ToArray();

Convert to string:

String result = string.join("",Array);

Write to textbox:

Textbox.text=result.tostring();

Didn´t use foreach but may solve your problem

Improve this answer

Comments

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.