public void WriteEnumerableIndex(long idx, BinaryWriter writer)
{
if (EnumerableIndexBytes == 1)
{
writer.WriteByteValue((byte)idx);
}
else if (EnumerableIndexBytes == 2)
{
writer.WriteUInt16Value((ushort)idx);
}
else if (EnumerableIndexBytes == 4)
{
writer.WriteUInt32Value((UInt32)idx);
}
else if (EnumerableIndexBytes == 8)
{
writer.WriteUInt64Value((ulong)idx);
}
else
{
ThrowHelper.ThrowBinaryException();
}
}