EntityFramework中多个dbcontext中的每个请求的事务

Question

我正在使用Asp.Net MVC和Entity Framework。我有一个类来管理每个请求的事务，如下所示：

public class TransactionPerRequest :
    IRunOnEachRequest, IRunOnError, IRunAfterEachRequest
{
    private readonly ContextDB _Context;
    private readonly HttpContextBase _HttpContext;

    public TransactionPerRequest(ContextDB context,
        HttpContextBase httpContext)
    {
        _Context = context;
        _HttpContext = httpContext;
    }

    void IRunOnEachRequest.Execute()
    {
        _HttpContext.Items["_Transaction"] =
            _Context.Database.BeginTransaction(IsolationLevel.ReadCommitted);
    }

    void IRunOnError.Execute()
    {
        _HttpContext.Items["_Error"] = true;
    }

    void IRunAfterEachRequest.Execute()
    {
        var transaction = (DbContextTransaction)_HttpContext.Items["_Transaction"];

        if (_HttpContext.Items["_Error"] != null)
            transaction.Rollback();
        else
            transaction.Commit();
    }
}

我想按照here

的说明使用多个上下文

如何更改TransactionPerRequset课程？