Question

我是Iquerable的新人。我想将“selectedBus”中的所有项目与OR连接，并将“depositi”中的所有项目与OR连接。然后我想要2谓词（谓词和谓词3）与AND运算符。

 var predicate = PredicateBuilder.False<tb_pulizie>();
    var predicate3 = PredicateBuilder.False<tb_pulizie>();
var result = Context.tb_pulizie.AsQueryable();
         if (selectedBus != null)
                        {
                           foreach (string keyword in selectedBus)
                            {
                                string temp = keyword;
                                predicate = predicate.Or(p => p.ID.Contains(temp));        
                            }
                            result = Context.tb_pulizie.AsExpandable().Where(predicate);
                           // result = result.Where(predicate);
                        }

    if (depositi != null)
                    {
                        foreach (string keyword in depositi)
                        {
                            string temp = keyword;
                            predicate3 = predicate3.Or(p => p.deposito.Contains(temp));
                        }
                        result = Context.tb_pulizie.AsExpandable().Where(predicate3);

                    }

我该怎么办？谢谢！

Answer 1

使用具有ExpressionStarter的最新LINQKit（从NuGet获取）来自动处理And与Or，以及最新的C＃7.0，您可以：

var predicate1 = PredicateBuilder.New<tb_pulizie>();
if (selectedBus != null)
    foreach (string keyword in selectedBus)
        predicate1 = predicate1.Or(p => p.ID.Contains(keyword));

var predicate2 = PredicateBuilder.New<tb_pulizie>();
if (depositi != null)
    foreach (string keyword in depositi)
        predicate2 = predicate2.Or(p => p.deposito.Contains(keyword));

var result = Context.tb_pulizie.AsExpandable().Where(predicate1.And(predicate2));

可操作的MVC操作

1 个答案: