相关疑难解决方法(0)

我试图使用AsyncTargetingPack异步将一些信息记录到针对.NET 4.0的MVC 4控制器操作中的SQL Server.我会直接跳到.NET 4.5,但我的应用程序存在于Azure中,我们仍在等待更新 ...

此代码按预期工作(一行写入我的数据库,没有抛出异常):

public class SystemActionLogger : ISystemActionLogger
{
    private readonly ActionBlock<Tuple<SystemAction, object>> actionBlock;

    public SystemActionLogger(ISystemActionLogEntryRepository repository)
    {
        actionBlock = new ActionBlock<Tuple<SystemAction, object>>(
            entry => TaskEx.Run(async () =>
                {
                    string data = await JsonConvert.SerializeObjectAsync(entry.Item2);
                    await repository.PersistAsync(new SystemActionLogEntry(entry.Item1, data));
                }));
    }

    public void Log(SystemAction systemAction, object data)
    {
        actionBlock.Post(new Tuple<SystemAction, object>(systemAction, data));
    }
}

并且此代码抛出NullReferenceException:

public class SystemActionLogger : ISystemActionLogger
{
    private readonly ActionBlock<Tuple<SystemAction, object>> actionBlock;

    public SystemActionLogger(ISystemActionLogEntryRepository repository)
    {
        actionBlock = new ActionBlock<Tuple<SystemAction, object>>(async entry …