public bool CanCreate(IRow prevRow, IEnumerable <string> prevUniqueKeys)
{
if (UniqueKeys.Count() == 0 && IsRootRow)
{
return(true);
}
foreach (var column in UniqueKeys)
{
if (this[column] == DBNull.Value)
{
return(false);
}
}
if (prevRow == null)
{
return(true);
}
if (UniqueKeys.Count() == 0)
{
return(true);
}
foreach (var column in prevUniqueKeys.Merge(UniqueKeys))
{
if (this[column] == DBNull.Value && prevRow[column] == DBNull.Value)
{
continue;
}
if (this[column] == DBNull.Value && prevRow[column] != DBNull.Value)
{
return(true);
}
if (this[column] != DBNull.Value && prevRow[column] == DBNull.Value)
{
return(true);
}
if (this[column].ToString() != prevRow[column].ToString())
{
return(true);
}
}
return(false);
}