System.Security.SecurityElement.Escape C# (CSharp) Method

        public static string Escape(string str)
        {
            if (str == null)
                return null;

            StringBuilder sb = null;

            int strLen = str.Length;
            int index; // Pointer into the string that indicates the location of the current '&' character
            int newIndex = 0; // Pointer into the string that indicates the start index of the "remaining" string (that still needs to be processed).

            while (true)
            {
                index = str.IndexOfAny(s_escapeChars, newIndex);

                if (index == -1)
                {
                    if (sb == null)
                        return str;
                    else
                    {
                        sb.Append(str, newIndex, strLen - newIndex);
                        return sb.ToString();
                    }
                }
                else
                {
                    if (sb == null)
                        sb = new StringBuilder();

                    sb.Append(str, newIndex, index - newIndex);
                    sb.Append(GetEscapeSequence(str[index]));

                    newIndex = (index + 1);
                }
            }

            // no normal exit is possible
        }

        public override SecurityElement ToXml()
        {
            SecurityElement esd = CodeAccessPermission.CreatePermissionElement(this, "System.Security.Permissions.EnvironmentPermission");

            if (!IsUnrestricted())
            {
                if (this.m_read != null && !this.m_read.IsEmpty())
                {
                    esd.AddAttribute("Read", SecurityElement.Escape(m_read.ToString()));
                }
                if (this.m_write != null && !this.m_write.IsEmpty())
                {
                    esd.AddAttribute("Write", SecurityElement.Escape(m_write.ToString()));
                }
            }
            else
            {
                esd.AddAttribute("Unrestricted", "true");
            }
            return(esd);
        }