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Posted 14 Mar 2002

An INI file handling class using C#

, 14 Mar 2002
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A C# class that exposes the INI file handling functions from Kernal32.dll
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I created a C# class Ini which exposes 2 functions from KERNEL32.dll. These functions are: WritePrivateProfileString and GetPrivateProfileString

Namespaces you will need: System.Runtime.InteropServices and System.Text

The Class

using System;
using System.Runtime.InteropServices;
using System.Text;

namespace Ini
    /// <summary>
    /// Create a New INI file to store or load data
    /// </summary>
    public class IniFile
        public string path;

        private static extern long WritePrivateProfileString(string section,
            string key,string val,string filePath);
        private static extern int GetPrivateProfileString(string section,
                 string key,string def, StringBuilder retVal,
            int size,string filePath);

        /// <summary>
        /// INIFile Constructor.
        /// </summary>
        /// <PARAM name="INIPath"></PARAM>
        public IniFile(string INIPath)
            path = INIPath;
        /// <summary>
        /// Write Data to the INI File
        /// </summary>
        /// <PARAM name="Section"></PARAM>
        /// Section name
        /// <PARAM name="Key"></PARAM>
        /// Key Name
        /// <PARAM name="Value"></PARAM>
        /// Value Name
        public void IniWriteValue(string Section,string Key,string Value)
        /// <summary>
        /// Read Data Value From the Ini File
        /// </summary>
        /// <PARAM name="Section"></PARAM>
        /// <PARAM name="Key"></PARAM>
        /// <PARAM name="Path"></PARAM>
        /// <returns></returns>
        public string IniReadValue(string Section,string Key)
            StringBuilder temp = new StringBuilder(255);
            int i = GetPrivateProfileString(Section,Key,"",temp, 
                                            255, this.path);
            return temp.ToString();


Using the class

Steps to use the Ini class:

  1. In your project namespace definition add 
    using INI;
  2. Create a INIFile like this
    INIFile ini = new INIFile("C:\\test.ini");
  3. Use IniWriteValue to write a new value to a specific key in a section or use IniReadValue to read a value FROM a key in a specific Section.

That's all. It's very easy in C# to include API functions in your class(es).


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here


About the Author

Web Developer
Canada Canada
No Biography provided

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Comments and Discussions

Questionadd video Pin
Member 1298616412-Feb-17 15:50
memberMember 1298616412-Feb-17 15:50 
QuestionThis is awesome, but how to delete? Pin
Andy Cartwright11-Feb-16 22:58
memberAndy Cartwright11-Feb-16 22:58 
AnswerRe: This is awesome, but how to delete? Pin
Member 122924654-Jun-16 20:00
memberMember 122924654-Jun-16 20:00 
SuggestionBetter Updated Code Pin
LAoke2-Aug-15 7:25
memberLAoke2-Aug-15 7:25 
GeneralRe: Better Updated Code Pin
leftler23-Sep-15 13:00
memberleftler23-Sep-15 13:00 
QuestionThanks Pin
GoodID13-Jul-15 19:34
memberGoodID13-Jul-15 19:34 
QuestionNice Pin
Sivaraman Dhamodharan16-May-15 6:57
memberSivaraman Dhamodharan16-May-15 6:57 
GeneralThanks Pin
Member 113660234-Mar-15 15:36
memberMember 113660234-Mar-15 15:36 
GeneralThanks Pin
meridbt27-Feb-15 0:35
membermeridbt27-Feb-15 0:35 
QuestionTrouble with relative paths Pin
feraudy16-Feb-15 10:58
memberferaudy16-Feb-15 10:58 
GeneralMy vote of 1 Pin
Member 1050939219-Nov-14 13:23
memberMember 1050939219-Nov-14 13:23 
QuestionCann't able to Write values in Ini file Pin
Devendra lodha16-Oct-14 0:36
memberDevendra lodha16-Oct-14 0:36 
AnswerRe: Cann't able to Write values in Ini file Pin
Garth J Lancaster16-Oct-14 0:56
memberGarth J Lancaster16-Oct-14 0:56 
GeneralRe: Cann't able to Write values in Ini file Pin
Devendra lodha16-Oct-14 1:14
memberDevendra lodha16-Oct-14 1:14 
GeneralRe: Cann't able to Write values in Ini file Pin
Garth J Lancaster16-Oct-14 1:42
memberGarth J Lancaster16-Oct-14 1:42 
Questionwhat WritePrivateProfileString returns Pin
Devendra lodha15-Oct-14 22:51
memberDevendra lodha15-Oct-14 22:51 
Questionmy vote i 5 of 5 Pin
TorbjornWave2-Oct-14 1:54
memberTorbjornWave2-Oct-14 1:54 
GeneralMy Vote of 5 Pin
Szymon Roslowski6-Aug-14 6:49
memberSzymon Roslowski6-Aug-14 6:49 
QuestionSimple and great class Pin
Member 1038226927-Apr-14 3:41
memberMember 1038226927-Apr-14 3:41 
SuggestionSuggestion Pin
Nathan Ferreira Dos Santos30-Jan-14 14:41
memberNathan Ferreira Dos Santos30-Jan-14 14:41 
GeneralMy vote of 5 Pin
Elena Futornyak14-Jun-13 2:16
memberElena Futornyak14-Jun-13 2:16 
Questionoverwriting Pin
Member 998609411-Jun-13 17:06
memberMember 998609411-Jun-13 17:06 
GeneralMy vote of 5 Pin
Amogh Natu27-May-13 5:52
professionalAmogh Natu27-May-13 5:52 
GeneralMy vote of 5 Pin
jai_magical16-Apr-13 12:40
memberjai_magical16-Apr-13 12:40 
GeneralMy vote of 5 Pin
Saravanan.rex5-Sep-12 5:00
memberSaravanan.rex5-Sep-12 5:00 
GeneralRe: My vote of 5 Pin
Headzup27-Sep-12 3:16
memberHeadzup27-Sep-12 3:16 
GeneralRe: My vote of 5 Pin
Saravanan.rex27-Sep-12 8:23
memberSaravanan.rex27-Sep-12 8:23 
QuestionFormClosing Pin
paphnuty27-Aug-12 22:38
memberpaphnuty27-Aug-12 22:38 
Questionmy vote of 5 Pin
velt_99124-Apr-12 22:09
membervelt_99124-Apr-12 22:09 
QuestionIf you want to support unicode, use this. Pin
chozekun12-Mar-12 22:11
memberchozekun12-Mar-12 22:11 
GeneralMy vote of 5 Pin
koiser13-Feb-12 4:51
memberkoiser13-Feb-12 4:51 
GeneralMy vote of 5 Pin
sanket_14@rediff.com1-Nov-11 21:40
membersanket_14@rediff.com1-Nov-11 21:40 
GeneralMy vote of 5 Pin
Ali Fakoor21-Oct-11 22:44
memberAli Fakoor21-Oct-11 22:44 
QuestionRead and write ini files in VB.Net Pin
Nasenbaaer5-Oct-11 4:46
memberNasenbaaer5-Oct-11 4:46 
GeneralMy vote of 5 Pin
Nasenbaaer5-Oct-11 4:45
memberNasenbaaer5-Oct-11 4:45 
Questionhave 5 stars Pin
Shivamkalra22-Jun-11 19:57
memberShivamkalra22-Jun-11 19:57 
Question5 star Pin
Shivamkalra22-Jun-11 19:56
memberShivamkalra22-Jun-11 19:56 
RantOK Pin
mebaba13-May-11 0:06
membermebaba13-May-11 0:06 
GeneralMy vote of 5 Pin
Member 4458079 Jose5-May-11 16:35
memberMember 4458079 Jose5-May-11 16:35 
GeneralMy vote of 5 Pin
dv7617-Mar-11 23:20
memberdv7617-Mar-11 23:20 
Generalsuggestion to add some more methods to this class. Pin
hugoandrioli@yahoo.com28-Dec-10 1:15
memberhugoandrioli@yahoo.com28-Dec-10 1:15 
/// <summary>
/// see IniWriteValue, but write an integer
public void IniWriteInt(string section, string key, int value)

String s = Convert.ToString(value);
IniWriteValue(section, key, s);

/// <summary>
/// see IniReadValue, but read as an integer.
public int IniReadInt(string section, string key)
String s= IniReadValue(section,key);
String exceptionMsg = "string could not be converted to an int";
int value;
value = Convert.ToInt32(s);
catch (FormatException ex)
throw new IniFileException(exceptionMsg, ex);
catch (OverflowException ex)
throw new IniFileException(exceptionMsg, ex);
return value;

public class IniFileException : Exception
//TODO put this class in it's own file.

public IniFileException(String message)
: base(message)

public IniFileException(string message, Exception ex)
: base(message, ex)
GeneralRe: suggestion to add some more methods to this class. Pin
md5sum5-Jan-11 10:28
membermd5sum5-Jan-11 10:28 
GeneralRe: suggestion to add some more methods to this class. Pin
(^-^)h~ugo5-Jan-11 12:45
member(^-^)h~ugo5-Jan-11 12:45 
GeneralRe: suggestion to add some more methods to this class. [modified] Pin
md5sum5-Jan-11 13:02
membermd5sum5-Jan-11 13:02 
GeneralRe: suggestion to add some more methods to this class. Pin
tttony076-Mar-11 16:48
membertttony076-Mar-11 16:48 
GeneralRe: suggestion to add some more methods to this class. Pin
Member 922029317-Feb-14 9:55
memberMember 922029317-Feb-14 9:55 
GeneralStrings longer than 254 characters will be truncated. Pin
dgph21-Nov-10 18:34
memberdgph21-Nov-10 18:34 
GeneralRe: Strings longer than 254 characters will be truncated. Pin
f.rivato16-Jan-13 22:35
memberf.rivato16-Jan-13 22:35 
GeneralMy vote of 3 Pin
Daniel Moreland4-Nov-10 13:10
memberDaniel Moreland4-Nov-10 13:10 
GeneralUnable to add multiple record Pin
sammizai5-Oct-10 0:58
membersammizai5-Oct-10 0:58 

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