英文:
Combine Expression to create a predicate with linqkit
问题
.Where(p => p.FirstName == "John" && p.LastName == "Doe" && ((p.Age > 30 || p.Status >= 10)));
我有这个谓词，我想使用linqkit构建它，因为谓词可以根据选项更改。
我尝试过：
var predicate = PredicateBuilder.New<Person>();
var orPredicate = PredicateBuilder.New<Person>();
orPredicate.Or(p => p.Age > 30);
orPredicate.Or(p => p.Status >= 10);
Predicate.And(p => p.FirstName == "John");
Predicate.And(p => p.LastName == "Doe");
predicate = predicate.Or(orPredicate);
myQueryable = myQueryable.Where(predicate);
当我这样做时，结果就像每个条件之间是“或”关系一样。我错过了什么吗？
谢谢！
英文:
I have this predciate, I would like build it with linqkit because the predicate can change depending of options.
.Where(p => p.FirstName == "John" && p.LastName == "Doe" && ((p.Age > 30 || p.Status >= 10)));
I tried :
var predicate = PredicateBuilder.New<Person>();
var orPredicate = PredicateBuilder.New<Person>();
orPredicate.Or(p => p.Age > 30);
orPredicate.Or(p => p.Status >= 10);
Predicate.And(p => p.FirstName == "John");
Predicate.And(p => p.LastName == "Doe");
predicate = predicate.Or(orPredicate);
myQueryable = myQueryable.Where(predicate);
When I do this the result is like a "Or" between each(4) conditions. Am I missed something?
Thanks,
答案1
得分: 2
查看[文档](https://github.com/scottksmith95/LINQKit#nesting-predicates)后，我认为您的代码片段可以这样修复：
```csharp
var predicate = PredicateBuilder.New<Person>();
var orPredicate = PredicateBuilder.New<Person>();
orPredicate = orPredicate.Start(p => p.Age > 30);
orPredicate = orPredicate.Or(p => p.Status >= 10);
predicate = predicate.Start(p => p.FirstName == "John");
predicate = predicate.And(p => p.LastName == "Doe");
predicate = predicate.And(orPredicate);
myQueryable = myQueryable.Where(predicate);
请注意，我对LinqKit毫无经验，仅根据引用的文档提出了这些建议。
<details>
<summary>英文:</summary>
Looking at the (https://github.com/scottksmith95/LINQKit#nesting-predicates), I think your snippet can be fixed like so:
var predicate = PredicateBuilder.New<Person>();
var orPredicate = PredicateBuilder.New<Person>();
orPredicate = orPredicate.Start(p => p.Age > 30);
orPredicate = orPredicate.Or(p => p.Status >= 10);
predicate = predicate.Start(p => p.FirstName == "John");
predicate = predicate.And(p => p.LastName == "Doe");
predicate = predicate.And(orPredicate);
myQueryable = myQueryable.Where(predicate);
Mind that I have Zero experience with LinqKit and derived this just from referenced docs.
</details>
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