Operator '+' cannot be applied to operands of type 'string[]' and 'int'

Question

1.00/5 (2 votes)

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C#

protected void ddlCircle_SelectedIndexChanged(object sender, EventArgs e)
   {
     ArrayList list = new ArrayList();

     ShadingAnalysisDataSetTableAdapters.tbl_CadEngineersTeamTableAdapter cd;
     cd = new ShadingAnalysisDataSetTableAdapters.tbl_CadEngineersTeamTableAdapter();
     DataTable dt = new DataTable();
     dt = cd.GetAvailableData(ddlCircle.SelectedValue);

     int x;
     x = dt.Rows.Count;

       String [] a;
       String [] b = { "Team" };
       for (int i = 1; i <= x; i++)
       {
           a = b + i; // error popup here
       }
  }

Posted 23-Oct-14 20:22pm

Member 11042100

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Comments

Sinisa Hajnal 24-Oct-14 2:29am

So, what is the question? You could do this: String a = "test"; int i = 1; a + i.ToString = "test1", but you're trying to add string arrays. What do you expect as the result of your operation?

Your b is single element array...why not have String b = "Team"?

Maciej Los 24-Oct-14 2:33am

Why do you use arrays of string? Use:

String a = String.Empty();
String b= String.Empty();

.
And inside the loop: a += b + i.ToString();

2 solutions

Solution 3

Try:
That is some very odd code: it's not obvious exactly what you expect to get out of it - but there are more errors in there than you have seen so far!
First off, a is an array of strings - except you haven't allocated any space to hold the data.
Second, why is b and array of strings if you are only putting one element in there, and use the same element each time? Why not just a string?
Third, what do you expect the code

C#

a = b + i;

To actually do? Particularly in a loop?
Since you don't change b inside the loop, the whole loop can be replaced with a single statement using x since a would always contain the same value after it finishes anyway.
And a is an array (with no data), b is an array (with one element) and i is an integer - so I can't see anything particularly useful going into a anyway.

Think about what you are trying to achieve, rather than what you have written so far: because I think you have lost track of that - I suspect you meant to use dt in there somewhere to use the data you retrieved in the earlier code!

Posted 23-Oct-14 20:38pm

OriginalGriff

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Sinisa Hajnal · Accepted Answer · 2014-10-23T20:34:00

The intent here seems to generate the array of x teams with names Teamx. Please change your naming to better reflect the intent of the variable.

Do this:

C#

ArrayList teamList = new ArrayList;

for (int i = 1; i <= x; i++)
        {
            teamList.Add(String.Format("Team{0}", i)); 
        }

And if you really need string array then use

C#

String [] teams;
teams = teamList.ToArray(typeof( string ));