System.Xml.XmlBinaryReader.TryGetBase64ContentLength C# (CSharp) Méthode

        public override bool TryGetBase64ContentLength(out int length)
        {
            length = 0;
            if (!_buffered)
                return false;
            if (_arrayState != ArrayState.None)
                return false;
            int totalLength;
            if (!this.Node.Value.TryGetByteArrayLength(out totalLength))
                return false;
            int offset = BufferReader.Offset;
            try
            {
                bool done = false;
                while (!done && !BufferReader.EndOfFile)
                {
                    XmlBinaryNodeType nodeType = GetNodeType();
                    SkipNodeType();
                    int actual;
                    switch (nodeType)
                    {
                        case XmlBinaryNodeType.Bytes8TextWithEndElement:
                            actual = BufferReader.ReadUInt8();
                            done = true;
                            break;
                        case XmlBinaryNodeType.Bytes16TextWithEndElement:
                            actual = BufferReader.ReadUInt16();
                            done = true;
                            break;
                        case XmlBinaryNodeType.Bytes32TextWithEndElement:
                            actual = BufferReader.ReadUInt31();
                            done = true;
                            break;
                        case XmlBinaryNodeType.EndElement:
                            actual = 0;
                            done = true;
                            break;
                        case XmlBinaryNodeType.Bytes8Text:
                            actual = BufferReader.ReadUInt8();
                            break;
                        case XmlBinaryNodeType.Bytes16Text:
                            actual = BufferReader.ReadUInt16();
                            break;
                        case XmlBinaryNodeType.Bytes32Text:
                            actual = BufferReader.ReadUInt31();
                            break;
                        default:
                            // Non-optimal or unexpected node - fallback
                            return false;
                    }
                    BufferReader.Advance(actual);
                    if (totalLength > int.MaxValue - actual)
                        return false;
                    totalLength += actual;
                }
                length = totalLength;
                return true;
            }
            finally
            {
                BufferReader.Offset = offset;
            }
        }