EncoderReplacementFallback.cs

namespace System.Text
{
    [Serializable]
    [__DynamicallyInvokable]
    public sealed class EncoderReplacementFallback : EncoderFallback
    {
        private string strDefault;

        [__DynamicallyInvokable]
        public string DefaultString
        {
            [__DynamicallyInvokable]
            get
            {
                return strDefault;
            }
        }

        [__DynamicallyInvokable]
        public override int MaxCharCount
        {
            [__DynamicallyInvokable]
            get
            {
                return strDefault.Length;
            }
        }

        [__DynamicallyInvokable]
        public EncoderReplacementFallback()
            : this("?")
        {
        }

        [__DynamicallyInvokable]
        public EncoderReplacementFallback(string replacement)
        {
            if (replacement == null)
            {
                throw new ArgumentNullException("replacement");
            }
            bool flag = false;
            for (int i = 0; i < replacement.Length; i++)
            {
                if (char.IsSurrogate(replacement, i))
                {
                    if (char.IsHighSurrogate(replacement, i))
                    {
                        if (flag)
                        {
                            break;
                        }
                        flag = true;
                        continue;
                    }
                    if (!flag)
                    {
                        flag = true;
                        break;
                    }
                    flag = false;
                }
                else if (flag)
                {
                    break;
                }
            }
            if (flag)
            {
                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidCharSequenceNoIndex", "replacement"));
            }
            strDefault = replacement;
        }

        [__DynamicallyInvokable]
        public override EncoderFallbackBuffer CreateFallbackBuffer()
        {
            return new EncoderReplacementFallbackBuffer(this);
        }

        [__DynamicallyInvokable]
        public override bool Equals(object value)
        {
            EncoderReplacementFallback encoderReplacementFallback = value as EncoderReplacementFallback;
            if (encoderReplacementFallback != null)
            {
                return strDefault == encoderReplacementFallback.strDefault;
            }
            return false;
        }

        [__DynamicallyInvokable]
        public override int GetHashCode()
        {
            return strDefault.GetHashCode();
        }
    }
}