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提问 EF Core支持多线程并发吗 回答 不支持 报错 A second operation was started on this context instance before a previous operation completed. This is usually caused by 阅读全文
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提问 如何Linq左连接 回答 注意 into 推荐返回匿名类型 var query = from person in people join pet in pets on person equals pet.Owner into gj from subpet in gj.DefaultIfEmpt 阅读全文
摘要:
提问 如何优雅的时使用TryParse 回答 YES var d = double.TryParse("3.1415", out var value) ? value : 0, NO var value = 0d; var ok = double.TryParse("3.1415", out val 阅读全文