类的代码如下：
using System;
using System.Text;
using System.Runtime.InteropServices;
using System.Globalization;
using System.Collections.Generic; namespace Utilities
{
/// <summary>
/// Provides methods for reading and writing to an INI file.
/// </summary>
public class IniFile
{
/// <summary>
/// The maximum size of a section in an ini file.
/// </summary>
/// <remarks>
/// This property defines the maximum size of the buffers
/// used to retreive data from an ini file. This value is
/// the maximum allowed by the win32 functions
/// GetPrivateProfileSectionNames() or
/// GetPrivateProfileString().
/// </remarks>
public const int MaxSectionSize = 32767; // 32 KB //The path of the file we are operating on.
private string m_path; #region P/Invoke declares /// <summary>
/// A static class that provides the win32 P/Invoke signatures
/// used by this class.
/// </summary>
/// <remarks>
/// Note: In each of the declarations below, we explicitly set CharSet to
/// Auto. By default in C#, CharSet is set to Ansi, which reduces
/// performance on windows 2000 and above due to needing to convert strings
/// from Unicode (the native format for all .Net strings) to Ansi before
/// marshalling. Using Auto lets the marshaller select the Unicode version of
/// these functions when available.
/// </remarks>
[System.Security.SuppressUnmanagedCodeSecurity]
private static class NativeMethods
{
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
public static extern int GetPrivateProfileSectionNames(IntPtr lpszReturnBuffer,
uint nSize,
string lpFileName);[DllImport(
"kernel32.dll", CharSet = CharSet.Auto)]
public static extern uint GetPrivateProfileString(string lpAppName,
string lpKeyName,
string lpDefault,
StringBuilder lpReturnedString,
int nSize,
string lpFileName);[DllImport(
"kernel32.dll", CharSet = CharSet.Auto)]
public static extern uint GetPrivateProfileString(string lpAppName,
string lpKeyName,
string lpDefault,
[In, Out] char[] lpReturnedString,
int nSize,
string lpFileName);[DllImport(
"kernel32.dll", CharSet = CharSet.Auto)]
public static extern int GetPrivateProfileString(string lpAppName,
string lpKeyName,
string lpDefault,
IntPtr lpReturnedString,
uint nSize,
string lpFileName);[DllImport(
"kernel32.dll", CharSet = CharSet.Auto)]
public static extern int GetPrivateProfileInt(string lpAppName,
string lpKeyName,
int lpDefault,
string lpFileName);[DllImport(
"kernel32.dll", CharSet = CharSet.Auto)]
public static extern int GetPrivateProfileSection(string lpAppName,
IntPtr lpReturnedString,
uint nSize,
string lpFileName); //We explicitly enable the SetLastError attribute here because
// WritePrivateProfileString returns errors via SetLastError.
// Failure to set this can result in errors being lost during
// the marshal back to managed code.
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool WritePrivateProfileString(string lpAppName,
string lpKeyName,
string lpString,
string lpFileName);}
#endregion /// <summary>
/// Initializes a new instance of the <see cref="IniFile"/> class.
/// </summary>
/// <param name="path">The ini file to read and write from.</param>
public IniFile(string path)
{
//Convert to the full path. Because of backward compatibility,
// the win32 functions tend to assume the path should be the
// root Windows directory if it is not specified. By calling
// GetFullPath, we make sure we are always passing the full path
// the win32 functions.
m_path = System.IO.Path.GetFullPath(path);
} /// <summary>
/// Gets the full path of ini file this object instance is operating on.
/// </summary>
/// <value>A file path.</value>
public string Path
{
get
{
return m_path;
}
} #region Get Value Methods /// <summary>
/// Gets the value of a setting in an ini file as a <see cref="T:System.String"/>.
/// </summary>
/// <param name="sectionName">The name of the section to read from.</param>
/// <param name="keyName">The name of the key in section to read.</param>
/// <param name="defaultValue">The default value to return if the key
/// cannot be found.</param>
/// <returns>The value of the key, if found. Otherwise, returns
/// <paramref name="defaultValue"/></returns>
/// <remarks>
/// The retreived value must be less than 32KB in length.
/// </remarks>
/// <exception cref="ArgumentNullException">
/// <paramref name="sectionName"/> or <paramref name="keyName"/> are
/// a null reference (Nothing in VB)
/// </exception>
public string GetString(string sectionName,
string keyName,
string defaultValue)
{
if (sectionName == null)
throw new ArgumentNullException("sectionName"); if (keyName == null)
throw new ArgumentNullException("keyName");StringBuilder retval
= new StringBuilder(IniFile.MaxSectionSize);NativeMethods.GetPrivateProfileString(sectionName,
return retval.ToString();
keyName,
defaultValue,
retval,
IniFile.MaxSectionSize,
m_path);
} /// <summary>
/// Gets the value of a setting in an ini file as a <see cref="T:System.Int16"/>.
/// </summary>
/// <param name="sectionName">The name of the section to read from.</param>
/// <param name="keyName">The name of the key in section to read.</param>
/// <param name="defaultValue">The default value to return if the key
/// cannot be found.</param>
/// <returns>The value of the key, if found. Otherwise, returns
/// <paramref name="defaultValue"/>.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="sectionName"/> or <paramref name="keyName"/> are
/// a null reference (Nothing in VB)
/// </exception>
public int GetInt16(string sectionName,
string keyName,
short defaultValue)
{
int retval = GetInt32(sectionName, keyName, defaultValue); return Convert.ToInt16(retval);
} /// <summary>
/// Gets the value of a setting in an ini file as a <see cref="T:System.Int32"/>.
/// </summary>
/// <param name="sectionName">The name of the section to read from.</param>
/// <param name="keyName">The name of the key in section to read.</param>
/// <param name="defaultValue">The default value to return if the key
/// cannot be found.</param>
/// <returns>The value of the key, if found. Otherwise, returns
/// <paramref name="defaultValue"/></returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="sectionName"/> or <paramref name="keyName"/> are
/// a null reference (Nothing in VB)
/// </exception>
public int GetInt32(string sectionName,
string keyName,
int defaultValue)
{
if (sectionName == null)
throw new ArgumentNullException("sectionName"); if (keyName == null)
throw new ArgumentNullException("keyName"); return NativeMethods.GetPrivateProfileInt(sectionName, keyName, defaultValue, m_path);
} /// <summary>
/// Gets the value of a setting in an ini file as a <see cref="T:System.Double"/>.
/// </summary>
/// <param name="sectionName">The name of the section to read from.</param>
/// <param name="keyName">The name of the key in section to read.</param>
/// <param name="defaultValue">The default value to return if the key
/// cannot be found.</param>
/// <returns>The value of the key, if found. Otherwise, returns
/// <paramref name="defaultValue"/></returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="sectionName"/> or <paramref name="keyName"/> are
/// a null reference (Nothing in VB)
/// </exception>
public double GetDouble(string sectionName,
string keyName,
double defaultValue)
{
string retval = GetString(sectionName, keyName, ""); if (retval == null || retval.Length == 0)
{
return defaultValue;
} return Convert.ToDouble(retval, CultureInfo.InvariantCulture);
} #endregion #region GetSectionValues Methods /// <summary>
/// Gets all of the values in a section as a list.
/// </summary>
/// <param name="sectionName">
/// Name of the section to retrieve values from.
/// </param>
/// <returns>
/// A <see cref="List{T}"/> containing <see cref="KeyValuePair{T1, T2}"/> objects
/// that describe this section. Use this verison if a section may contain
/// multiple items with the same key value. If you know that a section
/// cannot contain multiple values with the same key name or you don't
/// care about the duplicates, use the more convenient
/// <see cref="GetSectionValues"/> function.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="sectionName"/> is a null reference (Nothing in VB)
/// </exception>
public List<KeyValuePair<string, string>> GetSectionValuesAsList(string sectionName)
{
List<KeyValuePair<string, string>> retval;
string[] keyValuePairs;
string key, value;
int equalSignPos; if (sectionName == null)
throw new ArgumentNullException("sectionName"); //Allocate a buffer for the returned section names.
IntPtr ptr = Marshal.AllocCoTaskMem(IniFile.MaxSectionSize); try
{
//Get the section key/value pairs into the buffer.
int len = NativeMethods.GetPrivateProfileSection(sectionName,
ptr,
IniFile.MaxSectionSize,
m_path);keyValuePairs
= ConvertNullSeperatedStringToStringArray(ptr, len);
}
finally
{
//Free the buffer
Marshal.FreeCoTaskMem(ptr);
} //Parse keyValue pairs and add them to the list.
retval = new List<KeyValuePair<string, string>>(keyValuePairs.Length); for (int i = 0; i < keyValuePairs.Length; ++i)
{
//Parse the "key=value" string into its constituent parts
equalSignPos = keyValuePairs[i].IndexOf('=');key
= keyValuePairs[i].Substring(0, equalSignPos);value
= keyValuePairs[i].Substring(equalSignPos + 1,
keyValuePairs[i].Length - equalSignPos - 1);retval.Add(
new KeyValuePair<string, string>(key, value) );
} return retval;
} /// <summary>
/// Gets all of the values in a section as a dictionary.
/// </summary>
/// <param name="sectionName">
/// Name of the section to retrieve values from.
/// </param>
/// <returns>
/// A <see cref="Dictionary{T, T}"/> containing the key/value
/// pairs found in this section.
/// </returns>
/// <remarks>
/// If a section contains more than one key with the same name,
/// this function only returns the first instance. If you need to
/// get all key/value pairs within a section even when keys have the
/// same name, use <see cref="GetSectionValuesAsList"/>.
/// </remarks>
/// <exception cref="ArgumentNullException">
/// <paramref name="sectionName"/> is a null reference (Nothing in VB)
/// </exception>
public Dictionary<string, string> GetSectionValues(string sectionName)
{
List<KeyValuePair<string, string>> keyValuePairs;
Dictionary<string, string> retval;keyValuePairs
= GetSectionValuesAsList(sectionName); //Convert list into a dictionary.
retval = new Dictionary<string, string>(keyValuePairs.Count); foreach (KeyValuePair<string, string> keyValuePair in keyValuePairs)
{
//Skip any key we have already seen.
if (!retval.ContainsKey(keyValuePair.Key))
{
retval.Add(keyValuePair.Key, keyValuePair.Value);
}
} return retval;
} #endregion #region Get Key/Section Names /// <summary>
/// Gets the names of all keys under a specific section in the ini file.
/// </summary>
/// <param name="sectionName">
/// The name of the section to read key names from.
/// </param>
/// <returns>An array of key names.</returns>
/// <remarks>
/// The total length of all key names in the section must be
/// less than 32KB in length.
/// </remarks>
/// <exception cref="ArgumentNullException">
/// <paramref name="sectionName"/> is a null reference (Nothing in VB)
/// </exception>
public string[] GetKeyNames(string sectionName)
{
int len;
string[] retval; if (sectionName == null)
throw new ArgumentNullException("sectionName"); //Allocate a buffer for the returned section names.
IntPtr ptr = Marshal.AllocCoTaskMem(IniFile.MaxSectionSize); try
{
//Get the section names into the buffer.
len = NativeMethods.GetPrivateProfileString(sectionName,
null,
null,
ptr,
IniFile.MaxSectionSize,
m_path);retval
= ConvertNullSeperatedStringToStringArray(ptr, len);
}
finally
{
//Free the buffer
Marshal.FreeCoTaskMem(ptr);
} return retval;
} /// <summary>
/// Gets the names of all sections in the ini file.
/// </summary>
/// <returns>An array of section names.</returns>
/// <remarks>
/// The total length of all section names in the section must be
/// less than 32KB in length.
/// </remarks>
public string[] GetSectionNames()
{
string[] retval;
int len; //Allocate a buffer for the returned section names.
IntPtr ptr = Marshal.AllocCoTaskMem(IniFile.MaxSectionSize); try
{
//Get the section names into the buffer.
len = NativeMethods.GetPrivateProfileSectionNames(ptr,
IniFile.MaxSectionSize, m_path);retval
= ConvertNullSeperatedStringToStringArray(ptr, len);
}
finally
{
//Free the buffer
Marshal.FreeCoTaskMem(ptr);
} return retval;
} /// <summary>
/// Converts the null seperated pointer to a string into a string array.
/// </summary>
/// <param name="ptr">A pointer to string data.</param>
/// <param name="valLength">
/// Length of the data pointed to by <paramref name="ptr"/>.
/// </param>
/// <returns>
/// An array of strings; one for each null found in the array of characters pointed
/// at by <paramref name="ptr"/>.
/// </returns>
private static string[] ConvertNullSeperatedStringToStringArray(IntPtr ptr, int valLength)
{
string[] retval; if (valLength == 0)
{
//Return an empty array.
retval = new string[0];
}
else
{
//Convert the buffer into a string. Decrease the length
//by 1 so tha