c# - 如何使用条件三元运算符分配Func <>？ [复制]

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How can I assign a Func<> conditionally between lambdas using the conditional ternary operator?

(3个答案)


4年前关闭。




我知道Func<>不能直接通过var关键字隐式键入，尽管我希望我可以对谓词进行以下赋值:

Func<Something, bool> filter = (someBooleanExpressionHere)
   ? x => x.SomeProp < 5
   : x => x.SomeProp >= 5;

但是，我收到错误cannot resolve the symbol, 'SomeProp'
此刻，我求助于较为繁琐的if branch分配，这似乎并不优雅。

Func<Something, bool> filter;
if (someBooleanExpressionHere)
{
    filter = x => x.SomeProp < 5;
}
else
{
    filter = x => x.SomeProp >= 5;
}

我错过了什么吗？还是需要坚持if-branch作业？

最佳答案

var filter = (someBooleanExpressionHere)
   ? new Func<Something, bool>(x => x.SomeProp < 5)
   : x => x.SomeProp >= 5;