如何用条件创建LINQ to SQL Group？

Question

如何创建LINQ to SQL请求,我可以在条件中使用group by？

例如:

    from ri in resItems
    group ri by new {groupByPackaging ? (ri.Model, ri.Condition, ri.Packaging) : (ri.Model, ri.Condition)}
    into g
        select new
        {
            ...
        }

Answer 1

我认为这就是你在寻找LINQ Conditional Group的原因

这是一个例子:

bool someFlag = false;
var result = from t in tableName
      group t by new { FieldA = (someFlag ? 0 : t.FieldA), t.FieldB } into g
      select g;