linq的三元运营商

问题描述

我需要一个三元运算符where where子句linq。



我尝试过：

I need a ternary operator in where clause linq.

What I have tried:

filteredItem = ItemList.Where(x =>; (Model != "" ? (x.ModelNumber.ToLower().Contains(Model.ToLower())) : x.ModelNumber)

推荐答案

Either the type of first_expression and second_expression must be the same, or an implicit conversion must exist from one type to the other.

希望这会有所帮助。

Hope this helps.

if Model does not equal ""
    // This will return a boolean value.
    return (x.ModelNumber.ToLower().Contains(Model.ToLower())
else
    // This will return whatever ModelNumber is.
    return x.ModelNumber

我非常怀疑你的ModelNumber是一个布尔值，所以你的两个返回类型是不同的。在三元操作中，这是一个灾难的处方。

I highly doubt your ModelNumber is a boolean so your two return types are different. In a Ternary operation, that is a recipe for disaster.

var filteredItems =
                string.IsNullOrWhiteSpace(Model)
                    ? ItemList
                    : ItemList.Where(x => x.ModelNumber.ToLowerInvariant().Contains(Model.ToLowerInvariant())).ToList();

希望这会有所帮助，祝你好运，下次请尝试更具体，或向我们展示更多代码。



干杯！

Hope this helps, good luck and next time please try to be more specific, or show us more code.

Cheers!

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