linq to sql设置根据主键更新记录

在save change前，调用如下方法就好了

SetUpdateCheckStatus(this, UpdateCheck.Never);

public static void SetUpdateCheckStatus(DataClassesDataContext dataContext, UpdateCheck updateCheckStatus)
        {
            System.Collections.Generic.IEnumerable<MetaTable> tables = dataContext.Mapping.GetTables();
            foreach (MetaTable table in tables)
            {
                System.Collections.ObjectModel.ReadOnlyCollection<MetaDataMember> dataMembers = table.RowType.DataMembers;
                foreach (MetaDataMember dataMember in dataMembers)
                {
                    if (!dataMember.IsPrimaryKey)
                    {
                        Type dataMemberType = dataMember.GetType();
                        //System.Data.Linq.Mapping.ColumnAttribute
                        if (dataMemberType.Name == "AttributedMetaDataMember")
                        {
                            FieldInfo underlyingAttributeField = dataMember.GetType().GetField("attrColumn", BindingFlags.Instance | BindingFlags.NonPublic);
                            if (underlyingAttributeField != null)
                            {
                                ColumnAttribute underlyingAttribute = underlyingAttributeField.GetValue(dataMember) as ColumnAttribute;
                                if (underlyingAttribute != null)
                                { underlyingAttribute.UpdateCheck = updateCheckStatus; }
                            }
                        }
                        else
                        {
                            FieldInfo underlyingField = dataMember.Type.GetField("updateCheck", BindingFlags.Instance | BindingFlags.NonPublic);
                            if (underlyingField != null)
                            { underlyingField.SetValue(dataMember, updateCheckStatus); }
                        }
                    }
                }
            }
        }