Question

Visual Studio 2017中ReSharper的一个重要特性是它将我的foreach循环重构为简单的Linq表达式。

所以它需要：

foreach (var windForecastDataRecord in good)
{
    var dbRec = new WindDayAheadHourForecast
    {
        SyncId = currentSyncJobId,
        Site = windForecastDataRecord.SITE,
        PredictionTimeEst = string.IsNullOrEmpty(windForecastDataRecord.PREDICTIONTIME)
                            ? (DateTime?) null: DateTime.Parse(windForecastDataRecord.PREDICTIONTIME),
        TimeEst = string.IsNullOrEmpty(windForecastDataRecord.TIME)
            ? (DateTime?)null : DateTime.Parse(windForecastDataRecord.TIME),
        MegaWatts = decimal.Parse(windForecastDataRecord.MW),
        MaxiumOutput = decimal.Parse(windForecastDataRecord.MAXIMUMOUTPUT),
        Flags = windForecastDataRecord.FLAGS,
        Grp = windForecastDataRecord.GROUP,
        Region = windForecastDataRecord.REGION,
        Zone = windForecastDataRecord.ZONE
    };
    dbRecords.Add(dbRec);
}

并成功：

var dbRecords = good.Select(windForecastDataRecord => new WindDayAheadHourForecast
                    {
                        SyncId = currentSyncJobId,
                        Site = windForecastDataRecord.SITE,
                        PredictionTimeEst = string.IsNullOrEmpty(windForecastDataRecord.PREDICTIONTIME)
                            ? (DateTime?) null
                            : DateTime.Parse(windForecastDataRecord.PREDICTIONTIME),
                        TimeEst = string.IsNullOrEmpty(windForecastDataRecord.TIME)
                            ? (DateTime?) null
                            : DateTime.Parse(windForecastDataRecord.TIME),
                        MegaWatts = decimal.Parse(windForecastDataRecord.MW),
                        MaxiumOutput = decimal.Parse(windForecastDataRecord.MAXIMUMOUTPUT),
                        Flags = windForecastDataRecord.FLAGS,
                        Grp = windForecastDataRecord.GROUP,
                        Region = windForecastDataRecord.REGION,
                        Zone = windForecastDataRecord.ZONE
                    })
                    .ToList();

但是，我的问题是，当需要调试或测试该语句时。有没有办法，我仍然可以像foreach一样逐个逐步浏览集合中的每个项目？

老实说，我不知道怎么样，因为它就像运行时只是在Linq Expression中构建集合的工作。所以我想真正的问题是你如何调试Linq表达式？

Answer 1

问题不在ForEach - 您可以在中间放置断点，即使在单行语句中也是如此。只需点击那里然后按F9即可。 ForEach没有任何改变。

问题在于您尝试在对象初始化程序语法糖的中间进行调试。这是不可能的。对象初始化器不应该是这么复杂。

请参阅：https://stackoverflow.com/a/5528738/7866667

将ForEach循环转换为Linq Expression时，如何调试每次迭代？

1 个答案: