XPathException.cs

using System.Resources;
using System.Runtime.Serialization;
using System.Security.Permissions;

namespace System.Xml.XPath
{
    [Serializable]
    public class XPathException : SystemException
    {
        private string res;

        private string[] args;

        private string message;

        public override string Message
        {
            get
            {
                if (message != null)
                {
                    return message;
                }
                return base.Message;
            }
        }

        protected XPathException(SerializationInfo info, StreamingContext context)
            : base(info, context)
        {
            res = (string)info.GetValue("res", typeof(string));
            args = (string[])info.GetValue("args", typeof(string[]));
            string text = null;
            SerializationInfoEnumerator enumerator = info.GetEnumerator();
            while (enumerator.MoveNext())
            {
                SerializationEntry current = enumerator.Current;
                if (current.Name == "version")
                {
                    text = (string)current.Value;
                }
            }
            if (text == null)
            {
                message = CreateMessage(res, args);
            }
            else
            {
                message = null;
            }
        }

        [SecurityPermission(SecurityAction.LinkDemand, SerializationFormatter = true)]
        public override void GetObjectData(SerializationInfo info, StreamingContext context)
        {
            base.GetObjectData(info, context);
            info.AddValue("res", res);
            info.AddValue("args", args);
            info.AddValue("version", "2.0");
        }

        public XPathException()
            : this(string.Empty, (Exception)null)
        {
        }

        public XPathException(string message)
            : this(message, (Exception)null)
        {
        }

        public XPathException(string message, Exception innerException)
            : this("Xml_UserException", new string[1]
            {
                message
            }, innerException)
        {
        }

        internal static XPathException Create(string res)
        {
            return new XPathException(res, (string[])null);
        }

        internal static XPathException Create(string res, string arg)
        {
            return new XPathException(res, new string[1]
            {
                arg
            });
        }

        internal static XPathException Create(string res, string arg, string arg2)
        {
            return new XPathException(res, new string[2]
            {
                arg,
                arg2
            });
        }

        internal static XPathException Create(string res, string arg, Exception innerException)
        {
            return new XPathException(res, new string[1]
            {
                arg
            }, innerException);
        }

        private XPathException(string res, string[] args)
            : this(res, args, null)
        {
        }

        private XPathException(string res, string[] args, Exception inner)
            : base(CreateMessage(res, args), inner)
        {
            base.HResult = -2146231997;
            this.res = res;
            this.args = args;
        }

        private static string CreateMessage(string res, string[] args)
        {
            try
            {
                string text = Res.GetString(res, args);
                if (text == null)
                {
                    text = "UNKNOWN(" + res + ")";
                }
                return text;
            }
            catch (MissingManifestResourceException)
            {
                return "UNKNOWN(" + res + ")";
            }
        }
    }
}