将当前事务传递给 DbCommand

Pass current transaction to DbCommand(将当前事务传递给 DbCommand)

问题描述

我正在开发一个使用 ASP.NET Core 2.1 和 EF Core 2.1 的项目.虽然大部分查询和命令都使用EF，但有些单元需要直接调用存储过程.

I'm working on a project using ASP.NET Core 2.1 and EF Core 2.1. Although most of queries and commands use EF, some units needs to call stored procedures directly.

我不能使用FromSql，因为它需要基于实体模型的结果集.

I can't use FromSql, because it needs results set based on entity models.

假设我们有这些方法:

public Task CommandOne(DbContext context)
{
    Entity entity = new Entity
    {
        Name = "Name"
    };
    context.DbSet<Entity>().Add(entity);
    return context.SaveChangesAsync();
}

public async Task CommandTwo(DbContext context)
{
    DbCommand command = context.Database.GetDbConnection().CreateCommand();
    command.CommandText = "storedProcName";
    command.CommandType = System.Data.CommandType.StoredProcedure;

    using (var reader = await command.ExecuteReaderAsync().ConfigureAwait(false))
    {
        // read result sets
    }
}

如果我像这样在一个事务中调用两个命令:

If I call both commands in one transaction like this:

public async Task UnitOfWork(DbContext dbContext)
{
    using (var transaction = await dbContext.Database.BeginTransactionAsync())
    {
        await CommandOne(dbContext);
        await CommandTwo(dbContext);
    }
}

这个异常会发生:

BeginExecuteReader 要求命令有一个事务，当分配给命令的连接处于挂起的本地事务中.该命令的 Transaction 属性尚未初始化.

BeginExecuteReader requires the command to have a transaction when the connection assigned to the command is in a pending local transaction. The Transaction property of the command has not been initialized.

不得不提，它并不像command.Transaction = ...那么简单.这需要与 EF 使用的事务不同的 DbTransaction.

I have to mention, it's not as simple as command.Transaction = .... This requires DbTransaction which differs from the transaction EF uses.

我已经囤了一个月了！有什么解决方法吗?非常感谢.

I've stocked with this for a month! Is there any workaround for this? Thank you so much.

推荐答案

不得不提，它不像command.Transaction = ....那么简单，这需要DbTransaction，这与EF使用的事务不同.

I have to mention, it's not as simple as command.Transaction = .... This requires DbTransaction which differs from the transaction EF uses.

其实是这样的.您只需要参考 Microsoft.EntityFrameworkCore.Relational 程序集并添加

Actually it is. All you need is a reference to Microsoft.EntityFrameworkCore.Relational assembly and add

using Microsoft.EntityFrameworkCore.Storage;

访问 GetDbTransaction 扩展方法:

to get access to GetDbTransaction extension method:

if (context.Database.CurrentTransaction != null)
    command.Transaction = context.Database.CurrentTransaction.GetDbTransaction();

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