Entity Model public class Trip { public Guid Identifier { get; set; } public DateTime StartDate { get; set; } //开始时间 public DateTime EndDate { get; set; } //结束时间 public decimal CostUSD { get; set; } //花费 }设置主键 public TripMap() { t

If you are using migrations you should be able to simply modify code based migration to use newsequentialid() as DefaultValueSql.[Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]public override void Up() { CreateTable( "SomeTable", c => new { Id = c.Guid(null

SQL Server2005提供的新函数：NEWSEQUENTIALID()在指定计算机上创建大于先前通过该函数生成的任何 GUID 的 GUID。原来生成新的GUID的方法是newid()，生成的GUID是无序的，在插入索引的时候会导致效率低下，现在NEWSEQUENTIALID()方法能生成有序的GUID，以减少叶级别索引上的页争用。注意：只要在安装了网卡的机器上，使用该函数生成的GUID才能是全世界唯一的，否则只能保证在这台机器上唯一。另外，该函数只能与 uniqueidentifier 类型表列上的 DEFAULT 约束一起使用，例如：CREATE TABLE myTable (Col

I like Mads Kristensen, he's often coming up with useful code snippets which he shares with the community AND he heads up the BlogEngine.NET project. He's produced the GuidEncoder helper class, which takes a standard guid like this:c9a646d3-9c61-4cb7-bfcd-ee2522c8f633And shortens it to a smaller str

As a follow-up on my post from yesterday about generating shorter GUIDs, I’ve created a small helper class in C#. The class encodes a GUID into a 22 character long string and decodes the string back to the original GUID again.That way you can save 10 characters from the original GUID and it is ASCII