protected virtual void VisitMember(MemberExpression exp, SqlVistorFlag flag)
{
if (exp.Expression != null &&
exp.Expression.NodeType == ExpressionType.Parameter)
{
if (flag.is_right && flag.vistor_type == SqlVistorType.Update)
{
var proParaName = flag.GetParaName(exp.Member.Name);
flag.Append(proParaName, true);
AddMemberProperty(proParaName, exp.Member.Name);
}
else
{
if (exp.Member.DeclaringType.GetTypeInfo().IsGenericType &&
exp.Member.DeclaringType?.GetGenericTypeDefinition() == typeof(Nullable <>))
{
if (exp.Member.Name == "Value")
{
Visit(exp.Expression, flag);
}
if (exp.Member.Name != "HasValue")
{
return;
}
var doesNotEqualNull = Expression.MakeBinary(ExpressionType.NotEqual, exp.Expression,
Expression.Constant(null));
Visit(doesNotEqualNull, flag);
}
else
{
flag.Append(flag.GetColName(exp.Member.Name), true);
}
}
}
else
{
var value = Expression.Lambda(exp).Compile().DynamicInvoke();
Visit(Expression.Constant(value), flag);
}
}
