c# 操作ini文件

INI文件是一种按照特点方式排列的文本文件。每一个INI文件构成都非常类似，由若干段落（section）组成，在每个带括号的标题下面，是若干个以单个单词开头的关键词（keyword）和一个等号，等

号右边的就是关键字对应的值（value）。其一般形式如下：

[section1]

keyword1=value1

keyword2=value2

keyword3=value3

[section2]

keyword1=value1

keyword2=value2

class Program

{

[DllImport("kernel32")]

private static extern long WritePrivateProfileString (string section ,string key , string val ,string filepath);

//参数说明：section：INI文件中的段落；key：INI文件中的关键字；val：INI文件中关键字的数值；filePath：INI文件的完整的路径和名称。

[DllImport ("kernel32")]

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

//参数说明：section：INI文件中的段落名称；key：INI文件中的关键字；def：无法读取时候时候的缺省数值；retVal：读取数值；size：数值的大小；filePath：INI文件的完整路径和名称。

public static void Main(string[] args)

{

string section="database";

string key="sql";

//string value="server.;database=pubs;uid=sa;pwd=";

string fileName="d:\\config.ini";

try

{

//写入ini节点

//WritePrivateProfileString(section,key,value,fileName);

//读取ini节点

StringBuilder sb=new StringBuilder(255);

GetPrivateProfileString(section,key,"无法读取",sb,255,fileName);

Console.WriteLine(sb.ToString());

}catch(Exception ex)

{

Console.WriteLine(ex.ToString());

}

Console.Write("Press any key to continue . . . ");

Console.ReadKey(true);

}

}

整理出ini文件操作辅且类

/// <summary>
/// 读写INI文件的类。
/// </summary>
public class INIHelper
{
// 读写INI文件相关。
[DllImport("kernel32.dll", EntryPoint = "WritePrivateProfileString", CharSet = CharSet.Ansi)]
public static extern long WritePrivateProfileString(string section, string key, string val, string filePath);
[DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileString", CharSet = CharSet.Ansi)]
public static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath);

[DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileSectionNames", CharSet = CharSet.Ansi)]
public static extern int GetPrivateProfileSectionNames(IntPtr lpszReturnBuffer, int nSize, string filePath);

[DllImport("KERNEL32.DLL ", EntryPoint = "GetPrivateProfileSection", CharSet = CharSet.Ansi)]
public static extern int GetPrivateProfileSection(string lpAppName, byte[] lpReturnedString, int nSize, string filePath);

/// <summary>
/// 向INI写入数据。
/// </summary>
/// <PARAM name="Section">节点名。</PARAM>
/// <PARAM name="Key">键名。</PARAM>
/// <PARAM name="Value">值名。</PARAM>
public static void Write(string Section, string Key, string Value, string path)
{
WritePrivateProfileString(Section, Key, Value, path);
}

/// <summary>
/// 读取INI数据。
/// </summary>
/// <PARAM name="Section">节点名。</PARAM>
/// <PARAM name="Key">键名。</PARAM>
/// <PARAM name="Path">值名。</PARAM>
/// <returns>相应的值。</returns>
public static string Read(string Section, string Key, string path)
{
StringBuilder temp = new StringBuilder(255);
int i = GetPrivateProfileString(Section, Key, "", temp, 255, path);
return temp.ToString();
}

/// <summary>
/// 读取一个ini里面所有的节
/// </summary>
/// <param name="sections"></param>
/// <param name="path"></param>
/// <returns></returns>
public static int GetAllSectionNames(out string[] sections, string path)
{
int MAX_BUFFER = 32767;
IntPtr pReturnedString = Marshal.AllocCoTaskMem(MAX_BUFFER);
int bytesReturned = GetPrivateProfileSectionNames(pReturnedString, MAX_BUFFER, path);
if (bytesReturned == 0)
{
sections = null;
return -1;
}
string local = Marshal.PtrToStringAnsi(pReturnedString, (int)bytesReturned).ToString();
Marshal.FreeCoTaskMem(pReturnedString);
//use of Substring below removes terminating null for split
sections = local.Substring(0, local.Length - 1).Split('\0');
return 0;
}

/// <summary>
/// 得到某个节点下面所有的key和value组合
/// </summary>
/// <param name="section"></param>
/// <param name="keys"></param>
/// <param name="values"></param>
/// <param name="path"></param>
/// <returns></returns>
public static int GetAllKeyValues(string section, out string[] keys, out string[] values, string path)
{
byte[] b = new byte[65535];

GetPrivateProfileSection(section, b, b.Length, path);
string s = System.Text.Encoding.Default.GetString(b);
string[] tmp = s.Split((char)0);
ArrayList result = new ArrayList();
foreach (string r in tmp)
{
if (r != string.Empty)
result.Add(r);
}
keys = new string[result.Count];
values = new string[result.Count];
for (int i = 0; i < result.Count; i++)
{
string[] item = result[i].ToString().Split(new char[] { '=' });
if (item.Length == 2)
{
keys[i] = item[0].Trim();
values[i] = item[1].Trim();
}
else if (item.Length == 1)
{
keys[i] = item[0].Trim();
values[i] = "";
}
else if (item.Length == 0)
{
keys[i] = "";
values[i] = "";
}
}

return 0;
}

}