how to remove last comma from query C#

Question

I am doing something as follows..

querybuilder = ("SELECT Type, Text FROM [Element] WHERE Id IN( ");
foreach (var item in CaseIdList)
{
   querybuilder += item + ",";
}
querybuilder += ")";

at the last insdie the closing bracket I am getting a comma. How to remove that.

Answer 1

use TrimEnd(','); to remove last comma from the string, string.TrimEnd

After the foreach loop use:

querbuilder = querybuilder.TrimEnd(',');

Instead of concatenating string, you may use StringBuilder class.

Answer 2

Firstly, I'd try to avoid including the values themselves directly. Use parameters where possible - it's less simple for IN(x, y, z) style parameters, but you can either use a table-valued parameter or simply dynamically create the parameter list (e.g. to IN(@p0, @p1, @p2))

Secondly, I'd avoid using string concatenation in a loop - use StringBuilder if you really have to loop round.

Thirdly, I'd use string.Join to avoid having to loop at all:

string commaSeparated = string.Join(", ", values);

Answer 3

Instead of the foreach-loop u can use the string.Join method. Take a look at this

Answer 4

You can use String.Join(",", item); This means there is no ugly trimming or splitting that you have to do.

Answer 5

I would use String.Join:

querybuilder = "SELECT Type, Text FROM [Element] WHERE Id IN( " + String.Join(",", CaseIdList.ToArray()) + ")";

I would also look into using Parameters instead of constructing SQL with strong concatenation - string concatenation is vulnerable to SQL injection attacks, and parameters are easy to use.

How you would switch to parameters depends on how you're accessing the database, and which database engine, but a quick google search should help.