private SqlExpression ExtractParameter(SqlExpression expr)
{
Type clrType = expr.ClrType;
if (expr.ClrType.IsValueType && !TypeSystem.IsNullableType(expr.ClrType))
{
clrType = typeof(Nullable <>).MakeGenericType(expr.ClrType);
}
this.externals.Add(expr);
SqlParameter sp = new SqlParameter(clrType, expr.SqlType, "@x" + (this.parameters.Count + 1), expr.SourceExpression);
this.parameters.Add(sp);
return(sp);
}
private static bool IsNullableHasValue(SqlMember m)
{
return(TypeSystem.IsNullableType(m.Expression.ClrType) && m.Member.Name == "HasValue");
}