如何从SQLDataReader到C#变量读取Rowversion或时间戳记SQL Server数据类型 [英] How Do I Read A Rowversion or Timestamp SQL Server Data Type From a SQLDataReader to a C# Variable

问题描述

我有一个SQL Server 2012数据库.每个表都有一组审核字段.一个是名为RowVer的列，其数据类型为timestamp(与rowversion相同).

I have a SQL Server 2012 database. Each table has a set of audit fields. One is a column named RowVer with a datatype of timestamp (same as rowversion).

我很难将SqlDataReader中的值读取到具有名为User.RowVersion且数据类型为Byte[]的属性的C#对象中.

I'm having difficulty reading the value from a SqlDataReader into a C# object with a property named User.RowVersion with a datatype of Byte[].

while (rdr.Read())块的代码段

...
user.DateCreated = rdr.GetDateTime(14);
user.CreatedByUserId = rdr.GetInt32(15);
if (!rdr.IsDBNull(16)) { user.DateLastUpdated = rdr.GetDateTime(16); }
if (!rdr.IsDBNull(17)) { user.LastUpdatedByUserId = rdr.GetInt32(17); }
user.RowVersion = rdr.???;
...

RowVersion值仅在更新数据库时用作并发比较.

The RowVersion value is only used as a comparison for concurrency when updating the database.

这当然不是EF实现.

推荐答案

如果您使用的是.NET 4.5或更高版本，则可以这样做

If you are using .NET 4.5 or newer you can do

user.RowVersion = rdr.GetFieldValue<byte[]>(18);

如果您使用的是4.0或更早的版本，则需要执行投射.

If you are on 4.0 or older you will need to perform a cast.

user.RowVersion = rdr.GetValue(18) as byte[];

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