我想，既然有下面的两个函数，也一定有我所说的这种函数？

Question

Public Declare Function GetPrivateProfileString Lib "kernel32" Alias "GetPrivateProfileStringA" _
(ByVal lpApplicationName As String, ByVal lpKeyName As String, ByVal lpDefault As String, _
ByVal lpReturnedString As String, ByVal nSize As Long, ByVal lpFileName As String) As Long

Public Declare Function WritePrivateProfileString Lib "kernel32" Alias "WritePrivateProfileStringA" _
(ByVal lpApplicationName As String, ByVal lpKeyName As String, ByVal lpString As String, _
ByVal lpFileName As String) As Long
Public MainIniFile As String

我用这套函数读写INI文件，可是怎么删除一个项，或者一个值？

挨个将值设为空不好。那样太麻烦。最好可以一次删除一个项以及其下的所有值（例如[Settings]以及它下面的所有值）。还得能单独删除一个值（例如aaa=1这一行）就像DeleteSetting()函数一样，只不过是针对ini文件而已。

Answer 1

代码：using System;using System.Collections.Generic;using System.Text;using System.Runtime.InteropServices;namespace IniFiles{public abstract class CustomIniFile{public CustomIniFile(string AFileName)&nbsp;{FFileName = AFileName;}private string FFileName;public string FileName{get { return FFileName; }}public virtual bool SectionExists(string Section){List<string> vStrings = new List<string>();ReadSections(vStrings);return vStrings.Contains(Section);}public virtual bool ValueExists(string Section, string Ident){List<string> vStrings = new List<string>();ReadSection(Section, vStrings);return vStrings.Contains(Ident);}public abstract string ReadString(string Section, string Ident, string Default);public abstract bool WriteString(string Section, string Ident, string Value);public abstract bool ReadSectionValues(string Section, List<string> Strings);public abstract bool ReadSection(string Section, List<string> Strings);public abstract bool ReadSections(List<string> Strings);public abstract bool EraseSection(string Section);public abstract bool DeleteKey(string Section, string Ident);public abstract bool UpdateFile();}/// <summary>/// 存储本地INI文件的类。/// </summary>public class IniFile : CustomIniFile{[DllImport("kernel32")]private static extern uint GetPrivateProfileString(string lpAppName, // points to section name&nbsp;string lpKeyName, // points to key name&nbsp;string lpDefault, // points to default string&nbsp;byte[] lpReturnedString, // points to destination buffer&nbsp;uint nSize, // size of destination buffer&nbsp;string lpFileName // points to initialization filename&nbsp;);[DllImport("kernel32")]private static extern bool WritePrivateProfileString(string lpAppName, // pointer to section name&nbsp;string lpKeyName, // pointer to key name&nbsp;string lpString, // pointer to string to add&nbsp;string lpFileName // pointer to initialization filename&nbsp;);/// <summary>/// 构造IniFile实例。/// <param name="AFileName">指定文件名</param>/// </summary>public IniFile(string AFileName): base(AFileName){}/// <summary>/// 析够IniFile实例。/// </summary>~IniFile(){UpdateFile();}/// <summary>/// 读取字符串值。/// <param name="Ident">指定变量标识。</param>/// <param name="Section">指定所在区域。</param>/// <param name="Default">指定默认值。</param>/// <returns>返回读取的字符串。如果读取失败则返回该值。</returns>/// </summary>public override string ReadString(string Section, string Ident, string Default){byte[] vBuffer = new byte[2048];uint vCount = GetPrivateProfileString(Section,Ident, Default, vBuffer, (uint)vBuffer.Length, FileName);return Encoding.Default.GetString(vBuffer, 0, (int)vCount);}/// <summary>/// 写入字符串值。/// </summary>/// <param name="Section">指定所在区域。</param>/// <param name="Ident">指定变量标识。</param>/// <param name="Value">所要写入的变量值。</param>/// <returns>返回写入是否成功。</returns>public override bool WriteString(string Section, string Ident, string Value){return WritePrivateProfileString(Section, Ident, Value, FileName);}/// <summary>/// 获得区域的完整文本。(变量名=值格式)。/// </summary>/// <param name="Section">指定区域标识。</param>/// <param name="Strings">输出处理结果。</param>/// <returns>返回读取是否成功。</returns>public override bool ReadSectionValues(string Section, List<string> Strings){List<string> vIdentList = new List<string>();if (!ReadSection(Section, vIdentList)) return false;foreach (string vIdent in vIdentList)Strings.Add(string.Format("{0}={1}", vIdent, ReadString(Section, vIdent, "")));return true;}/// <summary>/// 读取区域变量名列表。/// </summary>/// <param name="Section">指定区域名。</param>/// <param name="Strings">指定输出列表。</param>/// <returns>返回获取是否成功。</returns>public override bool ReadSection(string Section, List<string> Strings){byte[] vBuffer = new byte[16384];uint vLength = GetPrivateProfileString(Section, null, null, vBuffer,(uint)vBuffer.Length, FileName);int j = 0;for (int i = 0; i < vLength; i++)if (vBuffer[i] == 0){Strings.Add(Encoding.Default.GetString(vBuffer, j, i - j));j = i + 1;}return true;}/// <summary>/// 读取区域名列表。/// </summary>/// <param name="Strings">指定输出列表。</param>/// <returns></returns>public override bool ReadSections(List<string> Strings){byte[] vBuffer = new byte[16384];uint vLength = GetPrivateProfileString(null, null, null, vBuffer,&nbsp;(uint)vBuffer.Length, FileName);int j = 0;for (int i = 0; i < vLength; i++)if (vBuffer[i] == 0){Strings.Add(Encoding.Default.GetString(vBuffer, j, i - j));j = i + 1;}return true;}/// <summary>/// 删除指定区域。/// </summary>/// <param name="Section">指定区域名。</param>/// <returns>返回删除是否成功。</returns>public override bool EraseSection(string Section){return WritePrivateProfileString(Section, null, null, FileName);}/// <summary>/// 删除指定变量。/// </summary>/// <param name="Section">变量所在区域。</param>/// <param name="Ident">变量标识。</param>/// <returns>返回删除是否成功。</returns>public override bool DeleteKey(string Section, string Ident){return WritePrivateProfileString(Section, Ident, null, FileName);}/// <summary>/// 更新文件。/// </summary>/// <returns>返回更新是否成功。</returns>public override bool UpdateFile(){return WritePrivateProfileString(null, null, null, FileName);}}}EraseSection() // 删除一个区块DeleteKey() // 删除一个键值

Answer 2

删除节点及节点中所有值Public Sub EraseSection(ByVal Section As String, ByVal FileName As String)WritePrivateProfileString Section, Null, Null, FileNameEnd Sub&nbsp;删除指定值IdentWritePrivateProfileString(Section, Ident, null, FileName);