Entity Framework Code-First（9.2）：DataAnnotations - TimeStamp Attribute

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于 2016-07-05 16:27:00 发布

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原文链接：http://www.cnblogs.com/purplefox2008/p/5644109.html

本文介绍了如何在Entity Framework Code First中使用DataAnnotations的TimeStampAttribute。该属性仅能应用于域类的一个byte数组属性，并创建一个timestamp类型的列。通过具体示例展示了如何在学生类中实现并发检查。

DataAnnotations - TimeStamp Attribute:

TimeStamp attribute can be applied to only one byte array property of a domain class. TimeStamp attribute creates a column with timestamp datatype. Code-First automatically use this TimeStamp column in concurrency check.

Consider the following example.

using System.ComponentModel.DataAnnotations;

public class Student
{
    public Student()
    { 
        
    }

    public int StudentKey { get; set; }
     
    public string StudentName { get; set; }
        
    [TimeStamp]
    public byte[] RowVersion { get; set; }
}

As you can see in the above example, TimeStamp attribute is applied to Byte[] property of the Student class. So, Code First will create a timestamp column RowVersion in the Student table as shown below.