How do I assign a foreach iteration variable?

Question

1.00/5 (1 vote)

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Hello,

I have a

C#

foreach

loop running and I want to assign values to the variable but I am unable to. It shows me an error:

cannot assign because it is a foreach iteration variable

The same code in Visual Basic works fine:

VB

For Each spline As String In Regex.Split(replicFile, vbNewLine)
           Label9.Text = spline
           Me.Refresh()
           Do While spline.EndsWith(Chr(10)) Or spline.EndsWith(Chr(13))
               spline = spline.Substring(0, spline.Length - 1)
           Loop
           Do While spline.StartsWith(Chr(10)) Or spline.StartsWith(Chr(13))
               spline = spline.Substring(1, spline.Length - 1)
           Loop

Please help.

Regards
Aman Chaurasia

What I have tried:

C#

foreach (string spline in Regex.Split(replicFile, Environment.NewLine))
			{
				Label9.Text = spline;
				this.Refresh();
				while (spline.EndsWith(('\n').ToString()) || spline.EndsWith(('\r').ToString()))
				{
					spline = spline.Substring(0, spline.Length - 1);
				}
				while (spline.StartsWith(('\n').ToString()) || spline.StartsWith(('\r').ToString()))
				{
					spline = spline.Substring(1, spline.Length - 1);
				}

Posted 27-May-18 19:21pm

Primo Chalice

Updated 31-May-18 8:46am

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Richard Deeming · Answer 1 · 2018-05-31T08:47:00

Use a second variable:

C#

foreach (string s in Regex.Split(replicFile, Environment.NewLine))
{
    string spline = s;
    
    Label9.Text = spline;
    this.Refresh();
    
    while (spline.EndsWith(('\n').ToString()) || spline.EndsWith(('\r').ToString()))
    {
        spline = spline.Substring(0, spline.Length - 1);
    }
    while (spline.StartsWith(('\n').ToString()) || spline.StartsWith(('\r').ToString()))
    {
        spline = spline.Substring(1, spline.Length - 1);
    }

NB: You can replace both of those while loops with a single call to String.Trim[^]:

C#

foreach (string s in Regex.Split(replicFile, Environment.NewLine))
{
    string spline = s;
    
    Label9.Text = spline;
    this.Refresh();
    
    spline = spline.Trim(new[] { '\r', '\n' });

Dirk Bahle · Answer 2 · 2018-05-27T19:56:00

Solution 1

You have to use an equivalent

for (int i=0; i< ;++) {}

or

while

loop if you want to manipulate the collection while you loop over it.

Foreach does not support your use case.

Posted 27-May-18 19:56pm

Dirk Bahle

Comments

Primo Chalice 28-May-18 2:40am

Okay, I will do so. But then how did it work fine in Visual Basic?

Dirk Bahle 28-May-18 7:19am

Not sure why this works in VB.Net - but foreach will work as long as you do not change the collection you are iterating over - so its quit likely that you either do not change the source collection - or if you change it - the change is (implicitely?) applied after the collection is iterated over ...

F-ES Sitecore 1-Jun-18 4:31am

VB.net is a different language, it lets you do things that c# doesn't and vice versa. Asking why vb.net lets you do something and c# doesn't is like asking why French people refer to the things they eat as "aliments" rather than "food".