// Sort fields by field offsets.
public int CompareTo(object other)
{
FieldInfoEx otherF = other as FieldInfoEx;
if (otherF == null)
return -1;
return Offset.CompareTo(otherF.Offset);
}
internal BinaryOrderedUdtNormalizer(Type t, bool isTopLevelUdt)
{
_skipNormalize = false;
if (_skipNormalize)
{
// if skipping normalization, dont write the null
// byte header for IsNull
_isTopLevelUdt = true;
}
_isTopLevelUdt = true;
// get all the fields
FieldInfo[] fields = GetFields(t);
FieldsToNormalize = new FieldInfoEx[fields.Length];
int i = 0;
foreach (FieldInfo fi in fields)
{
int offset = Marshal.OffsetOf(fi.DeclaringType, fi.Name).ToInt32();
FieldsToNormalize[i++] = new FieldInfoEx(fi, offset, GetNormalizer(fi.FieldType));
}
//sort by offset
Array.Sort(FieldsToNormalize);
//if this is not a top-level udt, do setup for null values.
//null values need to compare less than all other values,
//so prefix a null byte indicator.
if (!_isTopLevelUdt)
{
//get the null value for this type, special case for sql types, which
//have a null field
if (typeof(INullable).IsAssignableFrom(t))
{
PropertyInfo pi = t.GetProperty("Null",
BindingFlags.Public | BindingFlags.Static);
if (pi == null || pi.PropertyType != t)
{
FieldInfo fi = t.GetField("Null", BindingFlags.Public | BindingFlags.Static);
if (fi == null || fi.FieldType != t)
{
throw new Exception("could not find Null field/property in nullable type " + t);
}
else
{
NullInstance = fi.GetValue(null);
}
}
else
{
NullInstance = pi.GetValue(null, null);
}
//create the padding buffer
_padBuffer = new byte[Size - 1];
}
}
}
// Sort fields by field offsets.
public int CompareTo(object other)
{
FieldInfoEx otherF = other as FieldInfoEx;
if (otherF == null)
{
return(-1);
}
return(this.offset.CompareTo(otherF.offset));
}