How do I use a foreach loop that output is in particular form.

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I am trying to fetch some ids in to the string in form as follows:

'1','2','3'

I used the following way but its not giving the appropriate result.

C#

foreach (DataRow drCont in dt.Rows)
       {
           sOptInContactsIDs = "'" + sOptInContactsIDs + "'"+  drCont["ContactID"] + "',";
       }

       sOptInContactsIDs = sOptInContactsIDs.Replace("'',", "");
       int icount = sOptInContactsIDs.Length;
       sOptInContactsIDs = sOptInContactsIDs.Remove(icount - 1);

I am missing some logic.....Plz help me on this.
Thanks.

Posted 8-Sep-14 23:23pm

lovejeet0707

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vr reddy 9-Sep-14 5:39am

please send me your result

2 solutions

Solution 3

Hello,
In C# .I will Suggest You To Use String.To Count the length Simply Use Spilt Function.
Declare

C#

string sOptInContactsIDs   = string.Empty; ;

First Check whether that Column Has value or not.

C#

     foreach (DataRow drCont in dt.Rows)
       {
             if(drCont["ContactID"]!=DBNull.Value)
                 {
                      if(sOptInContactsIDs ==  string.Empty)
                          sOptInContactsIDs = "'"+ drCont["ContactID"] +"'";
                       else
                           sOptInContactsIDs = sOptInContactsIDs +","  +"'"+ drCont["ContactID"] +"'";
                  }
   }//Close of for each loop
//For Spilting It 
         int icount = sOptInContactsIDs.Split(',');

Intially When First Row is Fetched & Value Is 1
then
sOptInContactsIDs="'"+1+"'"= '1'
For Second time assume value is 2
sOptInContactsIDs = '1'+","+"'"+2+"'"='1','2'

If you are aware of string.Format Use that One For Better Exection.
If Possible Use For Loop Instead of ForEach.

I have Used that Code in My Project . i have collected all Ids in Array. Then Using For Loop I have collected the value in string and inserted comma after that.

Hope It Helps You.

Happy Coding :-)

Posted 8-Sep-14 23:59pm

Neetin_1809

Updated 9-Sep-14 0:16am

v3

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OriginalGriff · Accepted Answer · 2014-09-08T23:30:00

Solution 1

Try this:

C#

string sep = "";
StringBuilder sb = new StringBuilder();
foreach (DataRow drCont in dt.Rows)
   {
   sb.AppendFormat("{0}'{1}'", sep, drCont["ContactID"]);
   sep = ",";
   }
sOptInContactsIDs = sb.ToString();

Posted 8-Sep-14 23:30pm

OriginalGriff

Comments

lovejeet0707 9-Sep-14 5:39am

Perfect...........Spot On...!!
Thanks Sir :)

OriginalGriff 9-Sep-14 5:49am

You're welcome!

Neetin_1809 9-Sep-14 6:25am

Sir ,
Clear & Easy To UnderStand Code . mY vOTE oF 5