C# 检查EF语句中的空实体

我有这样一句话：

AssignedCas AssignedCase in caseList.GroupBy(o => o.CaseBatch.CaseBatchName)
                                    .Select(g => g.First()).ToList()

AssignedCas AssignedCase in caseList.Where(o => o.CaseBatch.CaseBatchName != null)
                                    .GroupBy(o => o.CaseBatch.CaseBatchName)
                                    .Select(g => g.First()).ToList()

但是在时间

o.CaseBatch.CaseBatchName

可以是

null

，在这种情况下，上述语句将不会执行

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在上面的语句中是否有一种方法可以检查

CaseBatchName

是否不为null，然后才包括它。

您可能应该在Linq中添加一个where条件。就这样,

AssignedCas AssignedCase in caseList.GroupBy(o => o.CaseBatch.CaseBatchName)
                                    .Select(g => g.First()).ToList()

AssignedCas AssignedCase in caseList.Where(o => o.CaseBatch.CaseBatchName != null)
                                    .GroupBy(o => o.CaseBatch.CaseBatchName)
                                    .Select(g => g.First()).ToList()

caseList.Where（o=>o.CaseBatch.CaseBatchName！=null）.GroupBy（…

可能重复的