Whats wrong with this loop?

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VB

Public Class Form1
    Dim str() As String
    Dim x As Integer
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        For x = 0 To 5
            str(x) = " D"
        Next
    End Sub
End Class

I could have sworn to adding strings to an array in the past through a loop worked and now it just errors out.

Posted 14-Jan-11 3:25am

Herboren

Updated 14-Jan-11 3:55am

Nish Nishant

v2

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3 solutions

Solution 3

String is immutable, use StringBuilder

Copied from documentation:
A string is a sequential collection of Unicode characters, typically used to represent text, while a String is a sequential collection of System.Char objects that represents a string. The value of the String is the content of the sequential collection, and the value is immutable.

A String is called immutable because its value cannot be modified once it has been created. Methods that appear to modify a String actually return a new String containing the modification. If it is necessary to modify the actual contents of a string-like object, use the System.Text.StringBuilder class.

Regards
Espen Harlinn

Posted 14-Jan-11 3:32am

Espen Harlinn

Updated 14-Jan-11 3:35am

v2

Solution 4

Another way to do is:

Dim MyList as new list(of string)

For X = 0 to 5
    MyList.add " D"
Next

'Now you can just use MyList.ToArray()

Good luck! :thumbsup:

Erik.

Posted 17-Jan-11 14:47pm

MCS_Erik

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Abhinav S · Accepted Answer · 2011-01-14T03:31:00

Solution 1

You have not defined the array size.
You have declared an array that is then not initialized thus causing errors.

Use

VB

Dim str(4) As String

and you should be fine.

Posted 14-Jan-11 3:31am

Abhinav S

Comments

Nish Nishant 14-Jan-11 9:55am

Proposed as answer, voted 5.

Prerak Patel 18-Jan-11 4:00am

Shouldn't it be 5?? It's VB.Net.
Dim str(5) As String

Abhinav S 18-Jan-11 23:49pm

Good pint Prerak - but I hope the OP got the general idea.