实体框架5.0处理乐观并发异常？

public class Blog
{
    public int BlogId { get; set; }
    public string Name { get; set; }
    [Timestamp] // 等同于 [ConcurrencyCheck]
    public byte[] Timestamp { get; set; }
}

using (var context = new BloggingContext())
{
    var blog = context.Blogs.Find(1);
    blog.Name = "New Name";
    try
    {
        context.SaveChanges();
    }
    catch (DbUpdateConcurrencyException ex)
    {
        // 处理乐观并发异常
        foreach (var entry in ex.Entries)
        {
            if (entry.Entity is Blog)
            {
                var databaseEntity = context.Blogs.Find(1);
                entry.OriginalValues.SetValues(databaseEntity);
                entry.CurrentValues.SetValues(databaseEntity);
            }
            else
            {
                throw new NotSupportedException("未知实体类型");
            }
        }
    }
}