读写Ini文件

public class IniFile
{
private System.Collections.SortedList m_SectionList = new System.Collections.SortedList();

public IniFile()
{
}

public IniFile(string fileName)
{
m_FileName = fileName;

if( System.IO.File.Exists(fileName) )
{
LoadFrom(this.FileName);
}
}

private string m_FileName;
public string FileName
{
get
{
return m_FileName;
}
set
{
m_FileName = value;
}
}

public void LoadFrom(string fileName)
{
string s1, s2, key, v;
int index;
string section = string.Empty;
System.IO.StreamReader reader = new System.IO.StreamReader(fileName, System.Text.ASCIIEncoding.Default);
try
{
System.Collections.SortedList thisSection = null;

m_SectionList.Clear();

while(reader.Peek() >= 0)
{
s1 = reader.ReadLine();
s2 = s1.Trim();
if( s2.Length < 2)
{
continue;
}

if( s2[0] == '[' && s2[s2.Length -1]==']')
{
//new section
s1 = s2.Substring(1, s2.Length -2).Trim();
if( s1.Length == 0 )
{
continue;
}

section = s1;

thisSection = m_SectionList[section] as System.Collections.SortedList;
if( thisSection == null )
{
thisSection = new System.Collections.SortedList();
m_SectionList.Add(section, thisSection);
}

continue;
}
else
{
//old section
if( section == string.Empty)
{
continue;
}

index = s1.IndexOf("=");
if( index < 0 )
{
//no key or value
continue;
}

key = s1.Substring(0, index).Trim();
v = s1.Substring(index+1, s1.Length - index - 1);

if( key.Length == 0 || v.Length == 0 )
{
continue;
}

if( thisSection[key] == null )
{
thisSection.Add(key, v);
}
else
{
thisSection[key] = v;
}
}
}
}
finally
{
reader.Close();
}
}

public void SaveTo(string fileName)
{
System.Collections.SortedList thisSection;
string section, key, v;
string sectionFmt = "[{0}]/r/n";
string keyFmt = "{0}={1}/r/n";

System.IO.FileStream stream = new System.IO.FileStream(fileName, System.IO.FileMode.Create, System.IO.FileAccess.Write);
try
{
System.IO.StreamWriter writer = new System.IO.StreamWriter(stream, System.Text.ASCIIEncoding.Default);
try
{
for(int i=0; i<m_SectionList.Count; i++)
{
section = (string) m_SectionList.GetKey(i);
writer.Write( string.Format(sectionFmt, section) );

thisSection = m_SectionList.GetByIndex(i) as System.Collections.SortedList;
for(int j=0; j<thisSection.Count; j++)
{
key = (string) thisSection.GetKey(j);
v = (string) thisSection.GetByIndex(j);
writer.Write( string.Format(keyFmt, key, v) );
}
}
}
finally
{
writer.Close();
}
}
finally
{
stream.Close();
}
}

public void Updates()
{
this.SaveTo(this.FileName);
}

public string ReadString(string section, string key)
{
System.Collections.SortedList thisSection = m_SectionList[section] as System.Collections.SortedList;
if( thisSection == null )
{
return string.Empty;
}
else
{
object obj = thisSection[key];
if( obj == null )
{
return string.Empty;
}
else
{
return (string) obj;
}
}
}

public void WriteString(string section, string key, string value)
{
section = section.Trim();
key = key.Trim();
if( section == string.Empty || key == string.Empty )
{
return;
}

System.Collections.SortedList thisSection = m_SectionList[section] as System.Collections.SortedList;
if( thisSection == null )
{
thisSection = new System.Collections.SortedList();
m_SectionList.Add(section, thisSection);
}

object obj = thisSection[key];
if( obj == null )
{
thisSection.Add(key, value);
}
else
{
thisSection[key] = value;
}
}

public void EraseSection(string section)
{
m_SectionList.Remove(section);
}

public void DeleteKey(string section, string key)
{
System.Collections.SortedList thisSection = m_SectionList[section] as System.Collections.SortedList;
if( thisSection == null )
{
return;
}

thisSection.Remove(key);
}
}