gistfile1.cs

/// <summary>
/// Escapes an LDAP filter value.
/// </summary>
/// <param name="filter">Unescaped filter value.</param>
/// <param name="allowWildcard">If true, * will not be escaped.</param>
/// <returns><paramref name="filter"/> with all occurances of (, ), \, NUL and / (and eventually *) replaced.</returns>
/// <remarks>See http://msdn.microsoft.com/en-us/library/windows/desktop/aa746475(v=vs.85).aspx</remarks>
public static string EscapeFilterString( string filter, bool allowWildcard = false ) {
    string result = string.Empty;
    foreach( char c in filter ) {
        switch( c ) {
            case '*':
                if( allowWildcard ) {
                    result += "*";
                } else {
                    result += @"\2a";
                }
                break;
            case '(':
                result += @"\28";
                break;
            case ')':
                result += @"\29";
                break;
            case '\\':
                result += @"\5c";
                break;
            case '\0':
                result += @"\00";
                break;
            case '/':
                result += @"\2f";
                break;
            default:
                result += c;
                break;
        }
    }

    return result;
}