C# linq查询超时

下面的查询将生成下一个异常

 var consumption = (from c in context.ConsumptionSet
                           join pi in context.PropertiesInstanceSet on c.PropertiesInstanceID equals pi.PropertiesInstanceID
                           join ep in context.EquipmentPropertiesSet on pi.EquipmentPropertiesID equals ep.EquipmentPropertiesID
                           join e in context.EquipmentSet on ep.EquipmentID equals e.EquipmentID
                           join b in context.BoxSet on e.BoxID equals b.BoxID
                           where (b.UserID == userId && pi.ProprietesName == property && pi.Instance == 1 && e.IsGeneral == false && c.Date <= limitDate)
                           group c by e into grp
                           select new
                           {
                               eq = grp.Key,
                               //cons = grp.OrderByDescending(c => c.ConsumptionID).FirstOrDefault(),
                               cons = grp.LastOrDefault(),
                           }).ToDictionary(e => e.eq, e => e.cons);

我试图在连接字符串和数据库上下文中设置连接超时，但没有成功

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如果您想增加超时时间，可以尝试在上下文对象上设置CommandTimeout。我会查看生成的SQL，看看它是否构造得很差。这里涉及很多表-确保所有外键都已索引，并确保where子句中使用的字段是索引的和有选择性的。盲目地增加超时而不投资于问题是一个非常糟糕的主意。

Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding