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How do you TRIM n characters from a string from the right.

Posted on 2010-08-24
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Last Modified: 2013-12-17
I should trim last name of a employee to 18 characters even though if I get a 30 character last name from the database.
What is the best way to do that ? any help would be greatly appreciated.

Thanks
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Question by:prashant-Vanam
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Expert Comment

by:wellhole
ID: 33512257
lastname = lastname.substring(0, 18) // cut name starting from 0 for 18 characters
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LVL 14

Expert Comment

by:systan
ID: 33512312
Should this be;
text = text.substring(19, 30);
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Expert Comment

by:systan
ID: 33512356
Oh, I have it wrong, wellhole got it.
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LVL 14

Expert Comment

by:systan
ID: 33512389
He got it but with wrong comment, that's why I reverse it, but I got it wrong it code instead.

>>// cut name starting from 0 for 18 characters
// cut name starting from 19 to the last characters, instead.
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Author Comment

by:prashant-Vanam
ID: 33512399
str = str.Substring(0, 18);
str=str.Remove(18);

which one is better to use Substring or Remove
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Expert Comment

by:systan
ID: 33512528
str=str.Remove(18);

substring uses remove
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Author Comment

by:prashant-Vanam
ID: 33512827
Substring and remove throws exception if the length of the string is less than 18 characters.
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Author Comment

by:prashant-Vanam
ID: 33512867
This is my code ...I'm wring to a fixed length text file and I need to make sure that the length of the string doesnt break the pattern of fixed length text file. That means the length of the lastname should never be more than 18 characters. If it is more than 18 characters in the DB then I should truncate it to 18 characters.
using (var sw = new StreamWriter(txtFile))
            {
                foreach (Employee employee in lstEmployees)
                    sw.WriteLine(String.Format("{0}{1}{2}{3}{4}{5}{6}{7}{8}{9}{10}{11}{12}{13}{14}{15}{16}{17}{18}",
                                               employee.Ssn.Substring(0,9).PadRight(9),
                                               employee.EmployeeLastName.Substring(0,18).PadRight(18),
                                               employee.EmployeeFirstName.Remove(12).PadRight(11),
                                               employee.EmployeeMiddleName.Remove(1).PadRight(2),
                                               employee.EmployeeAddress1.Remove(46).PadRight(46),
                                               employee.EmployeeCity.Remove(16).PadRight(16),
                                               employee.EmployeeState.Remove(2).PadRight(2),
                                               employee.EmployeeZipCode.Remove(5).PadRight(5),
                                               employee.EmployeeZipCode4.Remove(21).PadRight(21),
                                               (string.IsNullOrEmpty(employee.HireDate) ? string.Empty : String.Format("{0:yyyyMMdd}", Convert.ToDateTime(employee.HireDate))).Remove(8).PadRight(8),
                                               (string.IsNullOrEmpty(employee.BirthDate) ? string.Empty : String.Format("{0:yyyyMMdd}", Convert.ToDateTime(employee.BirthDate))).Remove(8).PadRight(9),
                                                employee.CompanyName.Remove(30).PadRight(30),
                                                employee.CompanyAddress1.Remove(46).PadRight(46),
                                                employee.CompanyCity.Remove(16).PadRight(16),
                                                employee.CompanyState.Remove(2).PadRight(2),
                                                employee.CompanyZipCode.Remove(5).PadRight(5),
                                                employee.CompanyZipCode4.Remove(21).PadRight(21),
                                                employee.FederalId.Remove(52).PadRight(52),
                                                State.PlaceHolder.Remove(1).PadRight(1)));

            }

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Author Comment

by:prashant-Vanam
ID: 33512998
I will do this in the worst case........please let me know if anyone has any better solution.

Thanks
using (var sw = new StreamWriter(txtFile))
            {
                foreach (Employee employee in lstEmployees)
                    sw.WriteLine(String.Format("{0}{1}{2}{3}{4}{5}{6}{7}{8}{9}{10}{11}{12}{13}{14}{15}{16}{17}{18}",
                        (employee.Ssn.Length > 9 ? employee.Ssn.Substring(0, 9).PadRight(9) : employee.Ssn.PadRight(9)),
                        (employee.EmployeeLastName.Length > 18 ? employee.EmployeeLastName.Substring(0, 18).PadRight(18) : employee.EmployeeLastName.PadRight(18)),
                            }
}

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Accepted Solution

by:
wellhole earned 500 total points
ID: 33513442
That's actually among the best ways to do it. You can remove the PadRight from the Substring.PadRight because you're already guaranteed 18 length.
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