相关疑难解决方法(0)

我已经映射了实体框架实体.SQL Server 2008中的每个表都包含Timestamp列,该列被映射为字节数组.数组的长度始终为8.

现在我需要比较.NET中的时间戳值.我有两个解决方案,但我不知道哪个更好？

• 比较它作为数组.当第一对字节不同时返回false.
• 将字节数组转换为long,比较long.

哪种解决方案更好？或者还有其他解决方案吗？

我们有一个ASP.Net MVC应用程序,它使用EF4作为其数据访问层,我们看到当我们认为它们应该是没有抛出OptimisitcConcurrencyExceptions时的意外行为.

我们已将问题简化为以下代码...

   using System.Linq;
    using Project.Model;

    namespace OptimisticConcurrency
    {
        class Program
        {
            static void Main()
            {
                Contact firstContact = null;
                using (var firstEntities = new ProjectEntities())
                {
                    firstContact = (from c in firstEntities.Contacts 
                       where c.LastName == "smith" select c).Single();
                }

                using (var secondEntities = new ProjectEntities())
                {
                    var secondContact = (from c in secondEntities.Contacts 
                       where c.LastName == "smith" select c).Single();

                    secondContact.Title = "a";
                    secondEntities.SaveChanges();
                }

                firstContact.Title = "b";

                using (var thirdEntities = new ProjectEntities())
                {
                    var thirdContact = (from …